Prototype-to-Pilot DFM changes #2
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Description
V0.4 Fixes design errors from V0.3
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DRCY has reviewed this Design Review, and there should be a review posted below.
DRCY Connections Checker Review
DRCY reviewed the connections in the 4 page(s) that changed in this DR. From these pages, DRCY selected 110 component(s) to review, and found 8 potential issue(s) in 7 component(s). DRCY has posted comments on the schematic for each potential issue. For more details on the components reviewed and their connections, click on the dropdown below.
Component Details
DRCY selected and reviewed all connections from the following components of the schematic:
U1 - TPS54531 ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
BOOT pin connected to bootstrap capacitor C1 for high-side gate drive.
Pin 1 (BOOT) is connected to NetC1_1, which connects to one terminal of C1 (100nF bootstrap capacitor). The other terminal of C1 connects to NetC1_2, which is the switching node (PH pin). This is a standard bootstrap configuration used in buck converters to provide gate drive voltage for the high-side MOSFET. The bootstrap capacitor charges when the low-side switch is on and provides drive voltage when the high-side switch needs to turn on. Without the TPS54531DDAR datasheet, I'm relying on standard buck converter topology, but this connection follows typical design practices.VIN pin correctly connected to main power input VPWR.
Pin 2 (VIN) is connected to VPWR, which is the main power rail fed through fuses and protected by TVS diodes. This is the correct connection for the input voltage pin of a buck regulator. VPWR appears to be the filtered and protected input power that feeds the switching regulator.EN pin connected to enable/control network for regulator control.
Pin 3 (EN) is connected to NetR2_2, which is a control signal that connects to multiple components including comparators U21 and U6, current monitor U19, and various resistors. This appears to be an enable/disable control signal that can shut down the regulator based on various protection conditions. This is a typical connection for the enable pin of a switching regulator.SS pin connected to soft-start capacitor C171 for controlled startup.
Pin 4 (SS) is connected to NetC171_2, which connects to C171 (10nF capacitor) with the other terminal grounded. This is a standard soft-start configuration where the capacitor controls the ramp-up rate of the output voltage during startup, preventing excessive inrush current and providing a controlled startup sequence.VSNS pin connected to voltage feedback network for output regulation.
Pin 5 (VSNS) is connected to NetC3_1, which connects to the feedback voltage divider formed by R1 (10.2k) and R5 (1.96k), as well as current sense resistor R148 and current monitor U19. This appears to be the voltage sense pin that samples the output voltage for regulation. The connection to the voltage divider and current sensing components is appropriate for a buck converter's feedback control.COMP pin connected to compensation network for loop stability.
Pin 6 (COMP) is connected to NetC150_2, which connects to a compensation network consisting of C150 (2.2nF), C151 (22pF), and R10 (37.4k). This forms a Type II or Type III compensation network typical in switching regulators to ensure stable closed-loop operation. The component values and configuration appear appropriate for loop compensation.GND pin correctly connected to circuit ground.
Pin 7 (GND) is connected to the circuit ground (GND net). This is the correct connection for the ground reference of the switching regulator IC.PH pin connected to switching node with inductor and freewheeling diode.
Pin 8 (PH) is connected to NetC1_2, which is the switching node that connects to the inductor L1 pin 1, the cathode of freewheeling diode D2, and the bootstrap capacitor C1. This is the correct connection for the phase/switching node of a buck converter, where the high-side and low-side switches alternate to create the switching waveform that drives the inductor.PAD pin correctly connected to ground for thermal management.
Pin 9 (PAD) is connected to GND. This is the thermal pad of the IC package and should be connected to ground for proper heat dissipation and electrical stability. This connection is correct for thermal management.D2 - SK54B ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Anode correctly connected to ground for freewheeling diode operation.
The anode (pin A) is connected to GND. According to the SK54B datasheet (page 1), this is a Schottky rectifier with the anode as pin 2. In a buck converter, the freewheeling diode provides a current path for the inductor when the main switch turns off. With the anode connected to ground and cathode connected to the switching node, this diode will conduct when the switching node goes negative, providing the necessary freewheeling path. This is the correct orientation for a buck converter freewheeling diode.Cathode correctly connected to switching node for freewheeling operation.
The cathode (pin K) is connected to NetC1_2, which is the switching node from U1 pin 8 (PH). According to the SK54B datasheet (page 1), this is the cathode terminal. This connection allows the diode to conduct when the switching node voltage drops below ground, providing a path for inductor current during the off-time of the main switch. This is the correct connection for a freewheeling diode in a buck converter topology.L1 - 4.7uH 10A ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Terminal 1 correctly connected to switching node for buck converter operation.
Pin 1 is connected to NetC1_2, which is the switching node from the buck controller U1 pin 8 (PH). According to the SRP1038A datasheet (page 1), this is simply terminal 1 of the inductor. In a buck converter, one terminal of the inductor should connect to the switching node to receive the switched voltage waveform. This connection is correct for buck converter topology.Terminal 2 correctly connected to output node for buck converter filtering.
Pin 2 is connected to NetC3_2, which is the output node that connects to output capacitors C4 and C5, feedback components, and the regulated output. According to the SRP1038A datasheet (page 1), this is terminal 2 of the inductor. In a buck converter, the inductor filters the switched voltage to create a smooth DC output. This connection to the output node is correct for buck converter operation.U8 - MIC5353-3.3YMT-TR ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Enable pin correctly connected to +5VCC to enable the regulator when input power is present.
The EN pin is connected to the +5VCC net. According to the datasheet (page 9), this is an 'Enable Input. Active High. High = ON, Low = OFF. Do not leave floating.' Connecting this pin to the +5VCC rail ensures the regulator is enabled whenever the input supply is present. This is a correct implementation as it provides proper enable control and prevents the pin from floating, which could cause indeterminate output states.Ground pin correctly connected to the main ground plane.
The GND pin is connected to the GND net. According to the datasheet (page 9), this pin is simply 'Ground.' This connection to the main ground plane is correct and necessary for proper regulator operation.Input voltage pin correctly connected to +5VCC supply within acceptable voltage range.
The VIN pin is connected to the +5VCC net. According to the datasheet (page 9), this is the 'Supply input.' The datasheet features (page 1) specify an 'Input Voltage Range: 2.6V to 6V.' The 5V input is well within this acceptable range, making this connection correct for powering the 3.3V LDO regulator.Output voltage pin correctly connected to 3.3VCC rail to provide regulated 3.3V supply.
The VOUT pin is connected to the 3.3VCC net. According to the datasheet (page 9), this is the 'Output voltage.' This connection properly distributes the regulated 3.3V output to the 3.3VCC rail throughout the circuit. This is the correct implementation for a 3.3V fixed voltage regulator.ADJ pin correctly left unconnected as this is a fixed voltage regulator variant.
The ADJ pin is connected to an unconnected net (unconnected-(NetU8_5)). According to the datasheet (page 9), for fixed voltage packages this pin is 'NC' (No connection), while for adjustable versions it would be the 'Adjust Input.' The part number MIC5353-3.3YMT-TR indicates this is a fixed 3.3V version, so leaving this pin unconnected is the correct implementation.Bypass pin correctly connected to 100nF capacitor to ground for noise reduction.
The BYP pin is connected to NetC26_1, which connects to one terminal of capacitor C26 (100nF). According to the datasheet (page 9), this is the 'Reference Bypass: Connect external 0.1 µF to GND for reduced Output Noise. May be left open.' The schematic shows C26 as a 100nF (0.1µF) capacitor with the other terminal connected to GND, exactly matching the datasheet recommendation. This implementation will provide reduced output noise as intended.Thermal pad correctly connected to ground for proper heat dissipation.
The PAD pin is connected to the GND net. According to the datasheet (page 9), this is the 'Exposed Heatsink Pad. Pad connected to ground internally.' Connecting the thermal pad to ground is correct and necessary for proper thermal management of the regulator, allowing heat to be conducted away from the device through the PCB ground plane.U20 - 78L05 ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Output pin correctly connected to 5V0_AUX rail to provide auxiliary 5V supply.
The OUT pin is connected to the 5V0_AUX net. According to the datasheet (page 3), this is the 'Regulated output voltage (VO).' This connection properly distributes the regulated 5V output to create an auxiliary 5V supply rail (5V0_AUX) that is separate from the main +5VCC rail. This is correct for providing an independent auxiliary 5V supply.Ground pin correctly connected to the main ground plane.
The GND pin is connected to the GND net. According to the datasheet (page 3), this is the 'Ground reference.' This connection to the main ground plane is correct and necessary for proper regulator operation and to establish the reference for the output voltage.Input pin correctly connected to VPWR supply which is within the regulator's input voltage range.
The IN pin is connected to the VPWR net. According to the datasheet (page 3), this is the 'DC input voltage (VI).' The schematic text indicates inputs are compatible with 12-24VDC, and VPWR appears to be the main power input. The L78L05 datasheet typically specifies input voltage capability up to 30V, so the 12-24V input range is well within acceptable limits. This connection is correct for providing the unregulated input voltage to generate the 5V output.U19 - INA381_ALT ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
IN+ pin correctly connected to high-side of current sense resistor R148 for current monitoring of 5V rail.
Pin 1 (IN+) is connected to NetC3_2, which is the output of the TPS54531 buck regulator (U1 pin 5 VSNS) and connects to one side of the 0.01Ω current sense resistor R148. This is the correct connection for high-side current sensing, where IN+ should be connected to the supply side of the sense resistor. The voltage at this pin will be slightly higher than the load voltage by the voltage drop across R148, allowing the INA381 to measure the current through the sense resistor. Without the INA381A2IDSGR datasheet, I cannot verify the exact pin function, but this connection follows standard current monitor IC practices.Vs pin correctly connected to clean 5V0_AUX supply for powering the current monitor IC.
Pin 2 (Vs) is connected to 5V0_AUX, which is the output of the 78L05 linear regulator (U20). This provides a clean, regulated 5V supply for the INA381 current monitor IC, separate from the main +5VCC rail being monitored. Using a separate supply rail for the monitor IC is good practice as it ensures the monitor continues to function even if there are issues with the main rail being monitored. The 5V0_AUX rail is also used to power other control circuits like the reference voltage dividers.nALERT pin correctly connected to regulator enable for overcurrent protection functionality.
Pin 3 (nALERT) is connected to NetR2_2, which connects to the EN pin (pin 3) of the TPS54531 buck regulator (U1). This creates an overcurrent protection mechanism where the INA381 can disable the buck regulator by pulling the nALERT line low when an overcurrent condition is detected. The NetR2_2 net also connects to comparator outputs (U21 pin 4, U6 pin 4) and forms part of a larger protection and control network. This is a standard and correct implementation for current limiting protection.RESET pin correctly pulled high through 1kΩ resistor R102 to 5V0_AUX supply.
Pin 4 (RESET) is connected through R102 (1kΩ) to the 5V0_AUX supply rail. This provides a pull-up for the reset input, ensuring the INA381 is not held in reset during normal operation. The 1kΩ value is appropriate for a digital input pull-up resistor. Without the datasheet, I assume this is either a reset input that needs to be pulled high for normal operation, or a configuration pin. The connection appears correct for typical current monitor IC implementations.CMPREF pin correctly connected to voltage divider for setting current limit threshold.
Pin 5 (CMPREF) is connected to NetR115_1, which is the junction of a voltage divider formed by R115 (15kΩ) from 5V0_AUX and R119 (4.7kΩ) to GND. This voltage divider creates a reference voltage of approximately 5V × (4.7kΩ)/(15kΩ + 4.7kΩ) = 1.19V. This reference voltage sets the current limit threshold for the INA381. The voltage divider values appear reasonable for setting a current limit threshold, though the exact threshold depends on the INA381's internal gain and configuration which cannot be verified without the datasheet.CMPIN and VOUT pins connected together creating feedback loop for current limit comparator operation.
Pins 6 (CMPIN) and 7 (VOUT) are both connected to NetU19_6, creating a direct feedback connection between the comparator output and input. This configuration suggests the INA381 is being used as a current limit comparator rather than a simple current monitor. In this configuration, the VOUT would typically be an open-drain or open-collector output that gets pulled low when the current exceeds the threshold set by CMPREF (pin 5). The feedback to CMPIN likely provides hysteresis or latching behavior. Without the INA381A2IDSGR datasheet, I cannot verify the exact function, but this type of feedback connection is common in current limit applications.CMPIN and VOUT pins connected together creating feedback loop for current limit comparator operation.
Pins 6 (CMPIN) and 7 (VOUT) are both connected to NetU19_6, creating a direct feedback connection between the comparator output and input. This configuration suggests the INA381 is being used as a current limit comparator rather than a simple current monitor. In this configuration, the VOUT would typically be an open-drain or open-collector output that gets pulled low when the current exceeds the threshold set by CMPREF (pin 5). The feedback to CMPIN likely provides hysteresis or latching behavior. Without the INA381A2IDSGR datasheet, I cannot verify the exact function, but this type of feedback connection is common in current limit applications.IN- pin correctly connected to load side of current sense resistor for differential current measurement.
Pin 8 (IN-) is connected to +5VCC, which is the main 5V output rail after the current sense resistor R148. This is the correct connection for the negative input of a differential current sense amplifier. The voltage difference between IN+ (NetC3_2) and IN- (+5VCC) represents the voltage drop across the 0.01Ω sense resistor R148, which is proportional to the current flowing through the 5V rail. This differential measurement approach provides good common-mode rejection and accurate current sensing.GND pin correctly connected to circuit ground reference.
Pin 9 (GND) is connected to the circuit ground (GND net), which is the correct connection for the ground reference of the INA381 current monitor IC. This provides the reference potential for the IC's internal circuits and ensures proper operation of the current sensing and comparison functions.U21 - AP331A ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Inverting input connected to reference voltage divider from 5V0_AUX supply. This sets the comparison threshold for the under-voltage detection circuit.
Pin 1 (IN-) is connected to NetR157_1, which is the junction of a voltage divider formed by R157 (130k to 5V0_AUX) and R158 (100k to GND). This creates a reference voltage of approximately 5V * (100k/(130k+100k)) = 2.175V. According to the datasheet (page 2), pin 1 is the 'Inverting input' which matches the schematic connection. The voltage divider provides a stable reference threshold for comparison against the monitored VMOTA voltage. This connection is correct for an under-voltage monitoring circuit.Ground pin correctly connected to system ground reference.
Pin 2 (GND) is connected to the system GND net. According to the datasheet (page 2), pin 2 is the 'Ground reference' which exactly matches the schematic connection. This provides the ground reference for the comparator's internal circuitry. This connection is correct and necessary for proper operation.Non-inverting input connected to VMOTA voltage divider for monitoring the motor supply voltage.
Pin 3 (IN+) is connected to NetR154_2, which is the output of a voltage divider monitoring VMOTA. The divider consists of R154 (24k from VMOTA) and the parallel combination of R155 (10k to GND) and R156 (1M feedback resistor), creating approximately 9.9k effective resistance to ground. This results in a scaling factor of about 0.292, so the pin sees VMOTA * 0.292. According to the datasheet (page 2), pin 3 is the 'Non-inverting input' which matches the schematic. When VMOTA drops below the threshold (approximately 7.45V), IN+ will be less than IN- and the output will switch states. This connection is correct for voltage monitoring.Output pin connected to NetR2_2 which appears to be part of a larger control network with hysteresis feedback.
Pin 4 (OUT) is connected to NetR2_2, which connects to multiple other components in the system including the hysteresis feedback resistor R156. According to the datasheet (page 2), pin 4 is the 'Comparator output - uncommitted collector of grounded-emitter NPN transistor' which matches the schematic connection. The datasheet (page 5) states that 'Output pull-up resistor can be connected to any available power supply voltage within permitted range' and 'Multiple collectors can be tied together for output OR'ing function.' The connection to NetR2_2 allows the output to control other circuit elements and provides the feedback path through R156 for hysteresis. This connection is correct.Power supply pin connected to VPWR for comparator operation.
Pin 5 (VCC) is connected to VPWR. According to the datasheet (page 2), pin 5 is the 'Power supply input, 2.0V to 36V operating range' which matches the schematic connection. The datasheet (page 1) specifies 'Wide supply voltage range: 2.0V to 36V' so VPWR must be within this range for proper operation. This connection provides power to the comparator and is correct for normal operation.U6 - AP331A ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Inverting input connected to voltage divider from 5V0_AUX rail creating reference voltage. This connection is correct for voltage monitoring application.
Pin 1 is the inverting input (IN-) according to the datasheet (page 2) for SOT25 package. It connects to NetR57_1, which forms a voltage divider with R57 (130k to 5V0_AUX) and R58 (100k to GND). This creates a reference voltage of approximately 5V × 100k/(130k+100k) = 2.17V at the inverting input. This is a standard configuration for voltage monitoring circuits where a stable reference voltage is needed for comparison against the monitored voltage.Ground pin correctly connected to system ground. This connection is correct.
Pin 2 is the ground reference according to the datasheet (page 2). It is properly connected to the system GND net, which is the correct connection for the comparator's ground reference.Non-inverting input connected to VMOTE voltage divider with hysteresis feedback. This connection is correct for voltage monitoring.
Pin 3 is the non-inverting input (IN+) according to the datasheet (page 2) for SOT25 package. It connects to NetR26_2, which is the junction of a voltage divider formed by R26 (24k from VMOTE) and R56 (10k to GND), creating a scaled version of VMOTE voltage approximately equal to VMOTE × 10k/(24k+10k) = 0.294 × VMOTE. R28 (1M) provides positive feedback from the output to create hysteresis, preventing oscillation near the switching threshold. This is a standard voltage monitoring configuration.Output pin connected to control signal with hysteresis feedback. This connection is correct for voltage monitoring application.
Pin 4 is the comparator output according to the datasheet (page 2), described as 'uncommitted collector of grounded-emitter NPN transistor'. It connects to NetR2_2, which appears to be a control signal that likely enables/disables other circuits based on VMOTE voltage level. The connection also provides feedback through R28 (1M) to the non-inverting input for hysteresis. This is a proper open-collector output configuration typical for voltage monitoring circuits.Power supply input connected to VPWR rail. This connection is correct.
Pin 5 is the power supply input (Vcc) according to the datasheet (page 2), with an operating range of 2.0V to 36V. It is connected to VPWR, which appears to be the main power rail. This is the correct connection for powering the comparator. The datasheet (page 5) notes that the bias network establishes drain current independent of power supply voltage magnitude over 2.0V to 30V range, making VPWR a suitable supply source.F1 - 3557-2 ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Input terminal of fuse holder connected to VBED_IN for bed heater power input. Connection is correct for series fuse protection.
Pin 1 is connected to the VBED_IN net, which receives external bed heater power through test point TP44 and barrier terminal J3 pin 7. According to the datasheet (page 41), this pin is 'Contact 1' with power type, designed as a fuse contact terminal with brass and tin-nickel plating. The fuse holder is rated for 30 Amps @ 500V AC per the datasheet (page 41). This connection correctly places the fuse in series with the incoming bed heater power supply, providing overcurrent protection as intended. The connection follows standard practice for fuse placement in power input circuits.Output terminal of fuse holder connected to VBED for protected bed heater power distribution. Connection is correct for series fuse protection.
Pin 2 is connected to the VBED net, which distributes protected bed heater power to various components including capacitors C15, C13, C16, C210, test point TP43, barrier terminal J3 pin 9, and TVS diode D78. According to the datasheet (page 41), this pin is 'Contact 2' with power type, serving as the second fuse contact terminal. This connection correctly completes the series fuse protection circuit, allowing protected power to flow to downstream bed heater circuits only when the fuse is intact. The configuration properly isolates the bed heater power input from the distribution network through the fuse.F2 - 3557-2 ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
Input terminal of fuse holder connected to VPWR_IN for main power input. Connection is correct for series fuse protection.
Pin 1 is connected to the VPWR_IN net, which receives external main power through test point TP48 and barrier terminal J3 pin 5. According to the datasheet (page 41), this pin is 'Contact 1' with power type, designed as a fuse contact terminal. The fuse holder provides overcurrent protection for the main power rail. This connection correctly places the fuse in series with the incoming main power supply, which is standard practice for power input protection in electronic systems.Output terminal of fuse holder connected to VPWR for protected main power distribution. Connection is correct for series fuse protection.
Pin 2 is connected to the VPWR net, which distributes protected main power to multiple critical components including switching regulator U1 (VIN), linear regulator U20 (IN), comparators U21 and U6 (VCC), various decoupling capacitors, and other circuits. According to the datasheet (page 41), this pin is 'Contact 2' serving as the second fuse contact terminal. This connection properly completes the series fuse protection, ensuring that all downstream main power circuits receive overcurrent-protected power. The extensive distribution to multiple ICs and circuits confirms this is the main system power rail requiring fuse protection.D22 - SMAJ24A ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
Anode connected to GND for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VPWR rail against positive voltage spikes.
The anode is connected to the GND net, which is the standard configuration for unidirectional TVS diode protection of positive voltage rails. This allows the TVS diode to conduct and clamp voltage when VPWR exceeds the breakdown voltage (nominally 24V based on part number) relative to ground. The SMAJ24A is designed for overvoltage protection, and this anode-to-ground connection is the correct orientation for protecting against positive voltage transients on the VPWR main power rail. This configuration will limit voltage spikes that could damage downstream components powered by VPWR.Cathode connected to VPWR for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VPWR rail against positive voltage spikes.
The cathode is connected to the VPWR net, completing the standard TVS diode protection configuration. When voltage on VPWR exceeds the breakdown voltage relative to ground, the diode will conduct in the reverse direction, clamping the voltage and protecting downstream circuits. This cathode-to-rail connection is the correct orientation for a unidirectional TVS diode protecting a positive power supply. The VPWR rail supplies critical components including switching regulators and comparators, making overvoltage protection essential for system reliability.D43 - SMAJ24A ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
Anode connected to GND for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VMOTA rail against positive voltage spikes.
The anode is connected to the GND net, following the same standard TVS diode protection configuration as D22. This allows the diode to clamp positive voltage spikes on the VMOTA motor power rail when they exceed the breakdown voltage relative to ground. The VMOTA rail appears to supply motor circuits based on the net name and connections to motor-related components. This anode-to-ground orientation is correct for protecting against positive overvoltage transients that could occur in motor drive applications.Cathode connected to VMOTA for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VMOTA rail against positive voltage spikes.
The cathode is connected to the VMOTA net, completing the standard TVS protection for the motor power rail. This configuration will clamp positive voltage spikes on VMOTA relative to ground, protecting motor drive circuits and associated components. The VMOTA rail connects to various capacitors (C95, C94, C93) and other motor-related circuits, making overvoltage protection important for preventing damage from motor-generated transients or supply voltage spikes.D21 - SMAJ24A ❌
DRCY flagged 1 potential issues in this component.
⚠️ DRCY couldn't retrieve a Datasheet for this component.
TVS diode has anode connected to VMOTE and cathode to GND, which is reverse orientation compared to other TVS diodes. This connection appears incorrect and should likely be reversed.
TVS diode has anode connected to VMOTE and cathode to GND, which is reverse orientation compared to other TVS diodes. This connection appears incorrect and should likely be reversed.
D78 - SMAJ24A ✅
DRCY found no issues in this component 🎉
⚠️ DRCY couldn't retrieve a Datasheet for this component.
Anode connected to GND for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VBED rail against positive voltage spikes.
The anode is connected to the GND net, maintaining consistency with the standard TVS diode protection configuration used by D22 and D43. This allows the diode to conduct and clamp positive voltage spikes on the VBED bed heater power rail when they exceed the breakdown voltage relative to ground. The VBED rail supplies bed heater circuits and associated components, making overvoltage protection critical for preventing damage from supply transients or switching spikes in the bed heater system.Cathode connected to VBED for standard TVS diode overvoltage protection configuration. Connection is correct for protecting VBED rail against positive voltage spikes.
The cathode is connected to the VBED net, completing the standard TVS protection for the bed heater power rail. This configuration will clamp positive voltage transients on VBED relative to ground, protecting bed heater control circuits and associated components. The VBED rail connects to multiple capacitors (C15, C13, C16, C210) and other bed heater circuits, making this overvoltage protection essential for system reliability in high-power bed heater applications.P1 - Header 4X2 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
VFAN power pins provide fan power derived from VPWR through 0R jumper R103. Both pins carry the same VFAN rail for redundant power distribution.
Pins 1 and 3 are both connected to the VFAN net, which traces back through R103 (0R jumper) to VPWR. R103 is specified as 'CR0603-J/-000ELF' with 0.0 Ohm resistance, effectively connecting VFAN directly to VPWR. VPWR originates from F2 pin 2, which is fed from VPWR_IN through fuse F2. This configuration allows fan power to be derived from the main power rail with the option to isolate it if needed by changing R103. The dual pins provide redundant connections for higher current capacity or multiple fan connections. This is correct for a power distribution header.VFAN power pins provide fan power derived from VPWR through 0R jumper R103. Both pins carry the same VFAN rail for redundant power distribution.
Pins 1 and 3 are both connected to the VFAN net, which traces back through R103 (0R jumper) to VPWR. R103 is specified as 'CR0603-J/-000ELF' with 0.0 Ohm resistance, effectively connecting VFAN directly to VPWR. VPWR originates from F2 pin 2, which is fed from VPWR_IN through fuse F2. This configuration allows fan power to be derived from the main power rail with the option to isolate it if needed by changing R103. The dual pins provide redundant connections for higher current capacity or multiple fan connections. This is correct for a power distribution header.Ground pins provide return path for all power rails. All four pins are connected to the main GND net for robust ground distribution.
All four pins (2, 4, 6, 8) are connected to the GND net, which is the main ground reference for the circuit. This provides multiple ground return paths for the power rails distributed through this connector. The alternating power/ground pattern (power on odd pins, ground on even pins) is standard practice for power distribution connectors as it minimizes inductance and provides good current handling. Multiple ground pins reduce resistance and improve current distribution. This configuration is correct and follows good power distribution practices.Ground pins provide return path for all power rails. All four pins are connected to the main GND net for robust ground distribution.
All four pins (2, 4, 6, 8) are connected to the GND net, which is the main ground reference for the circuit. This provides multiple ground return paths for the power rails distributed through this connector. The alternating power/ground pattern (power on odd pins, ground on even pins) is standard practice for power distribution connectors as it minimizes inductance and provides good current handling. Multiple ground pins reduce resistance and improve current distribution. This configuration is correct and follows good power distribution practices.Ground pins provide return path for all power rails. All four pins are connected to the main GND net for robust ground distribution.
All four pins (2, 4, 6, 8) are connected to the GND net, which is the main ground reference for the circuit. This provides multiple ground return paths for the power rails distributed through this connector. The alternating power/ground pattern (power on odd pins, ground on even pins) is standard practice for power distribution connectors as it minimizes inductance and provides good current handling. Multiple ground pins reduce resistance and improve current distribution. This configuration is correct and follows good power distribution practices.Ground pins provide return path for all power rails. All four pins are connected to the main GND net for robust ground distribution.
All four pins (2, 4, 6, 8) are connected to the GND net, which is the main ground reference for the circuit. This provides multiple ground return paths for the power rails distributed through this connector. The alternating power/ground pattern (power on odd pins, ground on even pins) is standard practice for power distribution connectors as it minimizes inductance and provides good current handling. Multiple ground pins reduce resistance and improve current distribution. This configuration is correct and follows good power distribution practices.VPWR power pins distribute the main power rail from the fused input. Both pins carry the same VPWR rail for redundant high-current distribution.
Pins 5 and 7 are both connected to the VPWR net, which is the main power distribution rail. VPWR originates from F2 pin 2, where F2 is a fuse (3557-2, rated for 30A 500V) that protects the VPWR_IN input. The VPWR rail feeds multiple regulators including U1 (TPS54531 buck regulator), U20 (78L05 linear regulator), and various protection circuits. Having dual VPWR pins allows for higher current handling and redundant connections, which is appropriate for a main power distribution point. This configuration is correct for distributing the primary power rail.VPWR power pins distribute the main power rail from the fused input. Both pins carry the same VPWR rail for redundant high-current distribution.
Pins 5 and 7 are both connected to the VPWR net, which is the main power distribution rail. VPWR originates from F2 pin 2, where F2 is a fuse (3557-2, rated for 30A 500V) that protects the VPWR_IN input. The VPWR rail feeds multiple regulators including U1 (TPS54531 buck regulator), U20 (78L05 linear regulator), and various protection circuits. Having dual VPWR pins allows for higher current handling and redundant connections, which is appropriate for a main power distribution point. This configuration is correct for distributing the primary power rail.J3 - 10 Pos barrier ✅
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VMOTE pin provides motor power for extruder with proper filtering and protection. Connected to motor power rail through protection diode D21.
Pin 1 connects to the VMOTE net, which is a motor power rail specifically for extruder motors. This net connects through protection diode D21 (SMAJ24A TVS diode with 24V reverse standoff, 38.9V clamping), filtering capacitors C18 (100nF), C17 (1nF), and C14 (10uF). The VMOTE rail appears to be a separate motor power domain from VMOTA, likely for extruder motors that may have different power requirements. The protection and filtering components are appropriate for a motor power rail that may experience switching noise and voltage transients. This connection is correct for providing protected motor power.Ground pins provide return paths for all power domains. Multiple ground connections ensure robust current handling and low impedance return paths.
Pins 2, 4, 6, and 8 are all connected to the main GND net. This provides multiple ground return paths for the various power domains (VMOTE, VMOTA, VPWR_IN, VBED_IN) connected to this terminal block. Multiple ground connections are essential for high-current applications to minimize ground resistance and voltage drop. The alternating power/ground pattern also helps with EMI reduction by providing nearby return paths for each power connection. This is correct and follows good practices for power distribution terminal blocks.Ground pins provide return paths for all power domains. Multiple ground connections ensure robust current handling and low impedance return paths.
Pins 2, 4, 6, and 8 are all connected to the main GND net. This provides multiple ground return paths for the various power domains (VMOTE, VMOTA, VPWR_IN, VBED_IN) connected to this terminal block. Multiple ground connections are essential for high-current applications to minimize ground resistance and voltage drop. The alternating power/ground pattern also helps with EMI reduction by providing nearby return paths for each power connection. This is correct and follows good practices for power distribution terminal blocks.Ground pins provide return paths for all power domains. Multiple ground connections ensure robust current handling and low impedance return paths.
Pins 2, 4, 6, and 8 are all connected to the main GND net. This provides multiple ground return paths for the various power domains (VMOTE, VMOTA, VPWR_IN, VBED_IN) connected to this terminal block. Multiple ground connections are essential for high-current applications to minimize ground resistance and voltage drop. The alternating power/ground pattern also helps with EMI reduction by providing nearby return paths for each power connection. This is correct and follows good practices for power distribution terminal blocks.Ground pins provide return paths for all power domains. Multiple ground connections ensure robust current handling and low impedance return paths.
Pins 2, 4, 6, and 8 are all connected to the main GND net. This provides multiple ground return paths for the various power domains (VMOTE, VMOTA, VPWR_IN, VBED_IN) connected to this terminal block. Multiple ground connections are essential for high-current applications to minimize ground resistance and voltage drop. The alternating power/ground pattern also helps with EMI reduction by providing nearby return paths for each power connection. This is correct and follows good practices for power distribution terminal blocks.VMOTA pin provides motor power for axis motors with comprehensive protection including TVS diode and filtering capacitors.
Pin 3 connects to the VMOTA net, which provides power for axis motors (motors 1-4 based on schematic annotations). This rail has protection through TVS diode D43 (SMAJ24A, 24V reverse standoff, 38.9V clamping), filtering with capacitors C95 (100nF), C94 (1nF), and C93 (10uF), and voltage monitoring through comparator U21. The VMOTA rail is separate from VMOTE, allowing independent control and protection of different motor groups. The protection components are appropriate for motor loads that can generate back-EMF and switching transients. This connection is correct for axis motor power distribution.VPWR_IN pin accepts main power input and routes through fuse F2 for protection. This is the primary power input for the system.
Pin 5 connects to VPWR_IN, which is the main power input for the system. This connects directly to F2 pin 1, where F2 is a fuse block (Keystone 3557-2, rated 30A 500V) that protects the downstream VPWR rail. VPWR_IN also connects to test point TP48 for monitoring. The fused input protects against overcurrent conditions and is appropriate for the main power input. The connection follows proper power input design with immediate fusing after the input terminal. This connection is correct.VBED_IN pin accepts heated bed power input and routes through fuse F1 for protection. Dedicated input for high-current heated bed loads.
Pin 7 connects to VBED_IN, which is the power input specifically for heated bed circuits. This connects to F1 pin 1, where F1 is a fuse block (Keystone 3557-20, rated 30A 500V) that protects the VBED rail. Having a separate input for heated bed power allows for independent fusing and control of this high-current load. VBED_IN also connects to test point TP44 for monitoring. The separate fused input is appropriate for heated bed applications which can draw significant current. This connection is correct.VBED pin outputs fused heated bed power from F1. This provides protected power to heated bed circuits and monitoring.
Pin 9 connects to the VBED net, which is the output of fuse F1 (fed from VBED_IN). This rail provides power to heated bed circuits and has protection through TVS diode D78 (SMAJ24A), filtering with capacitors C15 (100nF), C13 (1nF), and C16 (10uF), and a large electrolytic capacitor C210 (100uF, 35V). The VBED rail also connects to test point TP43 and feeds voltage monitoring circuits. Having the heated bed power available at the terminal block allows for external heated bed connections while maintaining proper protection and filtering. This connection is correct.HTBD-OUT pin appears to be unconnected based on the net name. This may be intended for future heated bed control output or is currently unused.
Pin 10 connects to the 'HTBD-OUT' net, which appears to be unconnected based on the net name pattern and lack of other connections in the visible schematic. This could be intended for heated bed control output (possibly PWM or switching control) or may be reserved for future use. Without additional circuit context or datasheet information for the terminal block, it's difficult to determine if this should be connected. The terminal block is specified as '4DB-P108-10' with 10 circuits, so having all 10 positions available is expected. If this is intentionally unconnected for future use, it's acceptable, but if it should be connected to a heated bed control signal, that would be an error. Based on available information, this appears to be intentionally unconnected.D23 - 5988170107F ✅
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LED anode correctly connected through current limiting resistor R33 to 3.3VCC supply for status indication.
The anode pin connects to NetD23_A, which connects to pin 1 of current limiting resistor R33. R33 pin 2 connects to 3.3VCC power supply. This forms a proper LED driver circuit where current flows from 3.3VCC through the 1kΩ resistor and through the LED to ground. According to the datasheet (page 4-5), pin 2 is the anode connection for single color LEDs in 0402 package, though the schematic uses functional naming 'A' for anode. The LED has a forward voltage of 2V per the datasheet (page 1), so with 3.3V supply and 1kΩ resistor, the current will be approximately (3.3V - 2V) / 1kΩ = 1.3mA, which is appropriate for a status indicator LED.LED cathode correctly connected to ground to complete the current path for the status indicator circuit.
The cathode pin connects directly to the GND net, providing the return path for current flow through the LED. According to the datasheet (page 4-5), pin 1 is the cathode connection for single color LEDs in 0402 package, though the schematic uses functional naming 'C' for cathode. This connection is correct as the cathode should be connected to the lower potential (ground) to allow conventional current flow from anode to cathode when the LED is forward biased. The connection completes the circuit: 3.3VCC → R33 → LED anode to cathode → GND.R33 - RK73H1ETTP1001F ✅
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Current limiting resistor correctly connected between 3.3VCC supply and LED anode to limit current through the status indicator LED.
Pin 1 connects to NetD23_A (LED anode) and pin 2 connects to 3.3VCC supply, forming a current limiting circuit for LED D23. The 1kΩ resistance value provides appropriate current limiting for the green LED which has a 2V forward voltage according to the LED datasheet (page 1). With 3.3V supply, the current through the LED will be (3.3V - 2V) / 1kΩ = 1.3mA, which is suitable for a status indicator application. According to the resistor datasheet (page 4), both pins are resistor terminals with matte tin on Ni-barrier plating, and since this is a resistor, the pin assignment direction does not affect functionality. The 1/16W power rating from the datasheet (page 2) is adequate as the power dissipated will be approximately 1.3mA × 1.3V = 1.7mW, well below the 62.5mW rating.Current limiting resistor correctly connected between 3.3VCC supply and LED anode to limit current through the status indicator LED.
Pin 1 connects to NetD23_A (LED anode) and pin 2 connects to 3.3VCC supply, forming a current limiting circuit for LED D23. The 1kΩ resistance value provides appropriate current limiting for the green LED which has a 2V forward voltage according to the LED datasheet (page 1). With 3.3V supply, the current through the LED will be (3.3V - 2V) / 1kΩ = 1.3mA, which is suitable for a status indicator application. According to the resistor datasheet (page 4), both pins are resistor terminals with matte tin on Ni-barrier plating, and since this is a resistor, the pin assignment direction does not affect functionality. The 1/16W power rating from the datasheet (page 2) is adequate as the power dissipated will be approximately 1.3mA × 1.3V = 1.7mW, well below the 62.5mW rating.R1 - 10.2k 1% 0402 ✅
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Forms the upper portion of the output voltage feedback divider for the TPS54531 buck regulator. Connected between the output voltage (NetC3_2) and the feedback sense point (NetC3_1).
R1 is connected with pin 1 to NetC3_2 (the buck regulator output) and pin 2 to NetC3_1 (which connects to the VSNS pin 5 of U1 TPS54531). This forms the upper resistor of a voltage feedback divider with R5. The datasheet (page 3) confirms this is a standard 2-terminal resistor with matte tin on Ni-barrier terminations. The voltage divider ratio is R5/(R1+R5) = 1.96k/(10.2k+1.96k) ≈ 0.161, which with the TPS54531's typical 0.8V reference would set the output to approximately 4.97V, appropriate for a 5V rail. The connection follows standard buck regulator feedback design practices.Forms the upper portion of the output voltage feedback divider for the TPS54531 buck regulator. Connected between the output voltage (NetC3_2) and the feedback sense point (NetC3_1).
R1 is connected with pin 1 to NetC3_2 (the buck regulator output) and pin 2 to NetC3_1 (which connects to the VSNS pin 5 of U1 TPS54531). This forms the upper resistor of a voltage feedback divider with R5. The datasheet (page 3) confirms this is a standard 2-terminal resistor with matte tin on Ni-barrier terminations. The voltage divider ratio is R5/(R1+R5) = 1.96k/(10.2k+1.96k) ≈ 0.161, which with the TPS54531's typical 0.8V reference would set the output to approximately 4.97V, appropriate for a 5V rail. The connection follows standard buck regulator feedback design practices.R5 - 1.96k 1% 0402 ✅
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Forms the lower portion of the output voltage feedback divider for the TPS54531 buck regulator. Connected between ground and the feedback sense point (NetC3_1).
R5 is connected with pin 1 to GND and pin 2 to NetC3_1 (the VSNS feedback node). This forms the lower resistor of the voltage feedback divider with R1. The datasheet confirms this is a standard 2-terminal thick film resistor. The 1.96k value works with R1's 10.2k to create the proper feedback ratio for approximately 5V output regulation. This is a standard and correct connection for buck regulator feedback networks.Forms the lower portion of the output voltage feedback divider for the TPS54531 buck regulator. Connected between ground and the feedback sense point (NetC3_1).
R5 is connected with pin 1 to GND and pin 2 to NetC3_1 (the VSNS feedback node). This forms the lower resistor of the voltage feedback divider with R1. The datasheet confirms this is a standard 2-terminal thick film resistor. The 1.96k value works with R1's 10.2k to create the proper feedback ratio for approximately 5V output regulation. This is a standard and correct connection for buck regulator feedback networks.R10 - 37.4K 1% 0402 ✅
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Provides DC bias path to ground for the TPS54531 compensation network. Connected between ground and the compensation network node (NetC150_1).
R10 is connected with pin 1 to GND and pin 2 to NetC150_1, which connects to C150 pin 1. C150 pin 2 connects to the COMP pin 6 of the TPS54531. The datasheet (page 3) confirms this is a standard 2-terminal resistor. This resistor provides a DC path to ground for the compensation network, which is necessary for proper loop stability in the buck regulator. The 37.4k value is appropriate for this function, providing high impedance while ensuring DC bias. This is a correct and standard connection for buck regulator compensation networks.Provides DC bias path to ground for the TPS54531 compensation network. Connected between ground and the compensation network node (NetC150_1).
R10 is connected with pin 1 to GND and pin 2 to NetC150_1, which connects to C150 pin 1. C150 pin 2 connects to the COMP pin 6 of the TPS54531. The datasheet (page 3) confirms this is a standard 2-terminal resistor. This resistor provides a DC path to ground for the compensation network, which is necessary for proper loop stability in the buck regulator. The 37.4k value is appropriate for this function, providing high impedance while ensuring DC bias. This is a correct and standard connection for buck regulator compensation networks.R11 - 10k 1% 0402 ✅
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Provides pull-up for the TPS54531 enable pin. Connected between the power rail (VPWR) and the enable control net (NetR2_2).
R11 is connected with pin 1 to NetR2_2 and pin 2 to VPWR. NetR2_2 connects to the EN pin 3 of the TPS54531, as well as to various protection circuits (U19 nALERT, U21 and U6 comparator outputs). The datasheet (page 3) confirms this is a standard 2-terminal resistor with matte tin on Ni barrier plating. This resistor provides a pull-up to ensure the regulator is enabled when VPWR is present, while allowing protection circuits to pull the enable line low to disable the regulator when needed. The 10k value provides appropriate pull-up strength. This is a correct and standard connection for buck regulator enable control.Provides pull-up for the TPS54531 enable pin. Connected between the power rail (VPWR) and the enable control net (NetR2_2).
R11 is connected with pin 1 to NetR2_2 and pin 2 to VPWR. NetR2_2 connects to the EN pin 3 of the TPS54531, as well as to various protection circuits (U19 nALERT, U21 and U6 comparator outputs). The datasheet (page 3) confirms this is a standard 2-terminal resistor with matte tin on Ni barrier plating. This resistor provides a pull-up to ensure the regulator is enabled when VPWR is present, while allowing protection circuits to pull the enable line low to disable the regulator when needed. The 10k value provides appropriate pull-up strength. This is a correct and standard connection for buck regulator enable control.R2 - 1.4k 1% 0402 ✅
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Provides pull-down for the TPS54531 enable control network. Connected between ground and the enable control net (NetR2_2).
R2 is connected with pin 1 to GND and pin 2 to NetR2_2 (the enable control net). This forms a voltage divider with R11 and provides a pull-down path for the enable signal. The datasheet confirms this is a standard thick film chip resistor. The 1.4k value works with R11's 10k to create a voltage divider that allows proper enable control while providing a path for protection circuits (U19, U21, U6) to pull the enable line low when needed. This ensures the regulator can be properly disabled during fault conditions. This is a correct and standard connection for buck regulator enable control with protection.Provides pull-down for the TPS54531 enable control network. Connected between ground and the enable control net (NetR2_2).
R2 is connected with pin 1 to GND and pin 2 to NetR2_2 (the enable control net). This forms a voltage divider with R11 and provides a pull-down path for the enable signal. The datasheet confirms this is a standard thick film chip resistor. The 1.4k value works with R11's 10k to create a voltage divider that allows proper enable control while providing a path for protection circuits (U19, U21, U6) to pull the enable line low when needed. This ensures the regulator can be properly disabled during fault conditions. This is a correct and standard connection for buck regulator enable control with protection.J8 - USB-B ✅
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VBUS pin correctly connected to power filtering network through NetC43_2.
Pin 1 is the VBUS (+5V power) pin of the USB-B connector, connected to NetC43_2. This net connects to C43 pin 2 (10nF decoupling capacitor), D27 pin 5 (VCC of ESD protection device), FB29 pin 2 (ferrite bead), and TP61 (test point). The connection provides proper power distribution from the USB connector with appropriate filtering through C43 and FB29. This is a standard and correct configuration for USB power delivery.DM (D-) pin correctly connected to ESD protection device input.
Pin 2 is the D- (data minus) line of the USB connector, connected to the DM net. This net connects to D27 pin 1 (I/O1 input of the ESD protection device) and TP5 (test point). The connection properly routes the USB D- signal to the ESD protection device before continuing to downstream circuitry. This follows standard USB interface protection practices.DP (D+) pin correctly connected to ESD protection device input.
Pin 3 is the D+ (data plus) line of the USB connector, connected to the DP net. This net connects to D27 pin 3 (I/O2 input of the ESD protection device) and TP6 (test point). The connection properly routes the USB D+ signal to the ESD protection device before continuing to downstream circuitry. This follows standard USB interface protection practices.Ground and shield pins correctly connected to USB_GND net.
Pin 4 is the signal ground and pins 5,6 are shield connections, all connected to the USB_GND net. This net provides the ground reference for the USB interface and connects to the ESD protection device ground (D27 pin 2), decoupling capacitors, and other USB-side components. Connecting both signal ground and shield to the same net is standard practice for USB connectors to provide proper grounding and EMI shielding.Ground and shield pins correctly connected to USB_GND net.
Pin 4 is the signal ground and pins 5,6 are shield connections, all connected to the USB_GND net. This net provides the ground reference for the USB interface and connects to the ESD protection device ground (D27 pin 2), decoupling capacitors, and other USB-side components. Connecting both signal ground and shield to the same net is standard practice for USB connectors to provide proper grounding and EMI shielding.Ground and shield pins correctly connected to USB_GND net.
Pin 4 is the signal ground and pins 5,6 are shield connections, all connected to the USB_GND net. This net provides the ground reference for the USB interface and connects to the ESD protection device ground (D27 pin 2), decoupling capacitors, and other USB-side components. Connecting both signal ground and shield to the same net is standard practice for USB connectors to provide proper grounding and EMI shielding.D27 - PRTR5V0U2F ✅
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I/O1 input correctly connected to USB D- line for ESD protection.
Pin 1 is I/O1 input according to the datasheet (page 3), connected to the DM net which carries the USB D- signal from J8 pin 2. The PRTR5V0U2F is designed for 'ESD protection of two Hi-Speed data lines' (datasheet page 1) and is specifically intended for 'USB 2.0 interfaces' (datasheet page 1). This connection properly brings the USB D- signal into the ESD protection device for transient suppression before the signal continues to downstream circuitry.Ground pin correctly connected to USB ground reference.
Pin 2 is the GND (ground) pin according to the datasheet (page 3), connected to the USB_GND net. This provides the ground reference for the ESD protection device and is shared with the USB connector ground (J8 pins 4,5,6) and other USB-side components. This is the correct ground connection for the ESD protection device to function properly.I/O2 input correctly connected to USB D+ line for ESD protection.
Pin 3 is I/O2 input according to the datasheet (page 3), connected to the DP net which carries the USB D+ signal from J8 pin 3. This connection properly brings the USB D+ signal into the ESD protection device for transient suppression. The device provides 'ESD protection up to 8 kV' (datasheet page 1) with 'ultra low input/output to ground capacitance: C(I/O-GND)=1pF' (datasheet page 1), making it suitable for high-speed USB data protection.I/O2 output correctly connected to common mode choke for continued signal path.
Pin 4 is I/O2 output according to the datasheet (page 3), connected to NetD27_4 which goes to L5 pin 2 (common mode choke). This provides the protected USB D+ signal path continuing from the ESD protection device to the common mode choke for further filtering. The signal flow from USB connector → ESD protection → common mode choke is a standard and proper USB interface design.VCC pin correctly connected to USB VBUS for device power supply.
Pin 5 is the VCC (supply voltage) pin according to the datasheet (page 3), connected to NetC43_2 which carries the USB VBUS power from J8 pin 1. This provides power to the ESD protection device from the USB bus. The connection also includes proper decoupling through C43 (10nF capacitor) to USB_GND, which is appropriate for stable device operation.I/O1 output correctly connected to common mode choke for continued signal path.
Pin 6 is I/O1 output according to the datasheet (page 3), connected to NetD27_6 which goes to L5 pin 3 (common mode choke). This provides the protected USB D- signal path continuing from the ESD protection device to the common mode choke for further filtering. The bidirectional nature of the I/O pins (pins 1,6 for I/O1 and pins 3,4 for I/O2) allows proper signal flow in both directions while maintaining ESD protection.C43 - GRM155R71H103JA88D ✅
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Capacitor terminal correctly connected to USB ground for VBUS decoupling.
Pin 1 is a capacitor electrode terminal according to the datasheet (page 1), connected to USB_GND net. This forms the ground side of a decoupling capacitor for the USB VBUS power line. The 10nF capacitance value with 50V rating (datasheet page 1) is appropriate for USB power supply decoupling and transient filtering.Capacitor terminal correctly connected to USB VBUS for power supply decoupling.
Pin 2 is a capacitor electrode terminal according to the datasheet (page 1), connected to NetC43_2 which carries the USB VBUS power from J8 pin 1. This forms a decoupling capacitor between VBUS and ground, providing local energy storage and high-frequency noise filtering for the USB power supply. The X7R dielectric type provides stable capacitance over temperature (datasheet page 1), making it suitable for power supply applications.U9 - ADuM4160 ✅
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VBUS1 is correctly connected to USB power through ferrite bead and bypass capacitors.
Pin 1 (VBUS1) connects to net VUSB, which traces back to the USB connector J8 pin 1 through ferrite bead FB29 and includes proper bypass capacitors C28 and C32 to USB_GND. According to the datasheet (page 9), VBUS1 should be connected to the USB power bus (4.5V to 5.5V) when powered by USB bus voltage, with a bypass capacitor to GND1 required. The connection includes the recommended bypass capacitors and follows the USB power path correctly.GND1 is correctly connected to the USB ground domain.
Pin 2 (GND1) connects to net USB_GND, which is the ground reference for the USB side of the isolation barrier. This connects to USB connector ground (J8 pins 4, 5, 6), TVS diodes, and bypass capacitors on the USB side. The datasheet (page 9) specifies this as 'Ground reference for Isolator Side 1' and notes that pins 2 and 8 are internally connected and should both be connected to common ground, which is implemented correctly.VDD1 is correctly connected with bypass capacitor and control pin connections.
Pin 3 (VDD1) connects to net VDD1, which has bypass capacitor C39 to USB_GND and also connects to pins 4 (PDEN) and 5 (SPU) of the same component. According to the datasheet (page 9), when powered by USB bus voltage, VDD1 should be used for bypass capacitor to GND1 and signal lines requiring pull-up should be tied to this pin. The implementation correctly provides the bypass capacitor and ties the control pins as specified.PDEN is correctly tied to VDD1 for standard operation.
Pin 4 (PDEN) connects to net VDD1, effectively tying it high. The datasheet (page 9) explicitly states 'This pin must be connected to VDD1 for standard operation.' The connection enables standard downstream pull-down resistor operation as intended.SPU is correctly tied high to VDD1 for full speed operation and matches SPD configuration.
Pin 5 (SPU) connects to net VDD1, setting it high for full speed operation. The datasheet (page 9) states 'When SPU is tied high, the full speed slew rate, timing, and logic conventions are selected' and 'must match Pin 13 (both pins tied high or both pins tied low).' Pin 13 (SPD) is also tied high to 3.3VCC, so both speed select pins match as required for full speed USB operation.UD- is correctly connected through required 24Ω series resistor for full speed operation.
Pin 6 (UD-) connects through 24Ω resistor R43 to the common mode choke L5, which then connects to the USB connector D- line through TVS protection. The datasheet application info (page 11) states 'For full speed operation, the D+ and D− lines on each side require a 24 Ω ± 1% series termination resistor.' The 24Ω resistor R43 provides the required series termination for full speed USB operation.UD+ is correctly connected through required 24Ω series resistor for full speed operation.
Pin 7 (UD+) connects through 24Ω resistor R46 to the common mode choke L5, which then connects to the USB connector D+ line through TVS protection. Following the same datasheet requirement (page 11) as pin 6, the 24Ω resistor R46 provides the necessary series termination for full speed USB operation on the upstream D+ line.GND1 is correctly connected to USB ground domain, matching pin 2.
Pin 8 (GND1) connects to net USB_GND, identical to pin 2. The datasheet (page 9) confirms 'Pin 2 and Pin 8 are internally connected to each other, and it is recommended that both pins be connected to a common ground.' The implementation correctly connects both pins to the same USB ground domain.GND2 is correctly connected to the system ground domain.
Pin 9 (GND2) connects to net GND, which is the main system ground domain on the MCU side of the isolation barrier. The datasheet (page 9) specifies this as 'Ground reference for Isolator Side 2' and notes that pins 9 and 15 are internally connected and should be connected to common ground, which is properly implemented.Downstream D+ is correctly connected through 24Ω series resistor to MCU USB interface.
Pin 10 connects through 24Ω resistor R47 to net UMCU_P, which goes to the MCU's USB D+ pin (U11B pin 37 DHSDP). The datasheet (page 9) calls this pin 'DD+' (Downstream D+) while the schematic shows 'UD+ 2', but this is just naming convention. The 24Ω series resistor follows the datasheet requirement (page 11) for full speed operation series termination.Downstream D- is correctly connected through 24Ω series resistor to MCU USB interface.
Pin 11 connects through 24Ω resistor R45 to net UMCU_N, which goes to the MCU's USB D- pin (U11B pin 38 DHSDM). Similar to pin 10, the datasheet calls this 'DD-' while schematic shows 'UD- 2'. The 24Ω series resistor R45 provides the required series termination for full speed operation as specified in the datasheet (page 11).PIN is correctly tied to 3.3V supply for upstream pull-up enable operation.
Pin 12 (PIN) connects to net 3.3VCC. The datasheet (page 9) states 'PIN controls the power connection to the pull-up for the upstream port. It can be tied to VDD2 for operation on power-up.' Since VDD2 (pin 14) is also connected to +3.3VCC, tying PIN to the same 3.3V supply enables proper upstream pull-up operation for USB enumeration.SPD is correctly tied high for full speed operation and matches SPU configuration.
Pin 13 (SPD) connects to net 3.3VCC, setting it high for full speed operation on the downstream side. The datasheet (page 9) requires 'This input must be set high via connection to VDD2 or set low via connection to GND2 and must match Pin 5 (both pins tied high or both pins tied low).' Pin 5 (SPU) is also tied high, so both speed select pins correctly match for full speed operation.VDD2 is correctly connected to 3.3V supply with proper bypass capacitors.
Pin 14 (VDD2) connects to net +3.3VCC, which has bypass capacitors C29 and C33 to ground. The datasheet (page 9) specifies 'When the isolator is powered from a 3.3 V power supply, connect VBUS2 to VDD2 and to the external 3.3 V power supply. A bypass capacitor to GND2 is required.' The implementation correctly provides 3.3V power with required bypass capacitors.GND2 is correctly connected to system ground, matching pin 9.
Pin 15 (GND2) connects to net GND, identical to pin 9. The datasheet (page 9) confirms 'Pin 9 and Pin 15 are internally connected to each other, and it is recommended that both pins be connected to a common ground.' The implementation correctly connects both pins to the same system ground domain.VBUS2 is correctly connected to 3.3V supply matching VDD2 for 3.3V operation mode.
Pin 16 (VBUS2) connects to net +3.3VCC, same as VDD2 (pin 14). The datasheet (page 9) states 'When the isolator is powered from a 3.3 V power supply, connect VBUS2 to VDD2 and to the external 3.3 V power supply.' The implementation correctly ties both VBUS2 and VDD2 to the same 3.3V supply, which is the proper configuration for 3.3V operation mode rather than 5V USB bus power mode.L5 - DLW21HN900SQ2L ✅
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Input for USB UD_P signal through series resistor R46. Functions as one input of the common mode choke for EMI filtering.
Pin 1 connects to net NetL5_1, which connects to R46 pin 2. R46 pin 1 connects to UD_P from U9 pin 7 (USB isolator output). This creates a signal path: UD_P → R46 (24Ω) → L5 pin 1. The 24Ω series resistor provides impedance matching and signal integrity for USB 2.0 applications. Without the datasheet for DLW21HN900SQ2L, I cannot definitively verify the pinout, but based on the circuit topology and the part description as a '2 Line Common Mode Choke', this appears to be correctly connected as one input line of the differential pair for common mode noise filtering.Output for filtered USB signal connecting to TVS protection diode D27 pin 4. Part of the DP signal path after common mode filtering.
Pin 2 connects to net NetD27_4, which connects to D27 pin 4. D27 is a PRTR5V0U2F TVS diode where pin 4 appears to be a protected input that connects internally to pin 3 (DP output). The signal flow is: L5 pin 1 → (common mode filtering) → L5 pin 2 → D27 pin 4 → (TVS protection) → D27 pin 3 → DP. This configuration provides both common mode EMI filtering and ESD protection for the USB DP signal line. The connection appears correct for this signal conditioning topology.Output for filtered USB signal connecting to TVS protection diode D27 pin 6. Part of the DM signal path after common mode filtering.
Pin 3 connects to net NetD27_6, which connects to D27 pin 6. Following the same pattern as pin 2, D27 pin 6 appears to be a protected input that connects internally to pin 1 (DM output). The signal flow is: L5 pin 4 → (common mode filtering) → L5 pin 3 → D27 pin 6 → (TVS protection) → D27 pin 1 → DM. This provides common mode EMI filtering and ESD protection for the USB DM signal line, completing the differential pair protection. The connection appears correct and symmetric with the DP path.Input for USB UD_N signal through series resistor R43. Functions as the second input of the common mode choke for EMI filtering.
Pin 4 connects to net NetL5_4, which connects to R43 pin 2. R43 pin 1 connects to UD_N from U9 pin 6 (USB isolator output). This creates a signal path: UD_N → R43 (24Ω) → L5 pin 4. The 24Ω series resistor matches the impedance of R46 in the UD_P path, providing balanced impedance matching for the differential USB signals. Based on the circuit topology, this appears to be correctly connected as the second input line of the differential pair for the common mode choke, completing the EMI filtering circuit for both USB data lines.U11B - ATML-ATSAM3X-LQFP-144 ✅
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XOUT pin correctly connected to crystal oscillator terminal through NetC41_2.
Pin 35 is XOUT (Main Oscillator Output) according to the datasheet (page 8-12). It connects to NetC41_2, which connects to crystal X1 pin 3 (C2). This is the correct connection for the main crystal oscillator circuit. The crystal provides the main clock reference for the microcontroller, and XOUT should connect to one terminal of the crystal along with appropriate load capacitance (provided by C41).XIN pin correctly connected to crystal oscillator terminal through NetC42_2.
Pin 36 is XIN (Main Oscillator Input) according to the datasheet (page 8-12). It connects to NetC42_2, which connects to crystal X1 pin 1 (C1). This is the correct connection for the main crystal oscillator circuit. XIN should connect to the other terminal of the crystal along with appropriate load capacitance (provided by C42). The 12MHz crystal X1 provides the main system clock.DHSDP pin correctly connected to USB high speed data positive line.
Pin 37 is DHSDP (USB High Speed Data +) according to the datasheet (page 8-12). It connects to UMCU_P, which traces through the circuit to the USB isolator and ultimately to the USB connector. This is the correct connection for USB high speed operation. The signal path goes through series termination resistors and isolation circuitry, which is appropriate for USB signal integrity and isolation.DHSDM pin correctly connected to USB high speed data negative line.
Pin 38 is DHSDM (USB High Speed Data -) according to the datasheet (page 8-12). It connects to UMCU_N, which traces through the circuit to the USB isolator and ultimately to the USB connector. This is the correct connection for USB high speed operation. The signal path goes through series termination resistors and isolation circuitry, which is appropriate for USB signal integrity and isolation.VBUS pin correctly connected to USB bus power measurement circuit.
Pin 39 is VBUS (USB Bus Power Measurement Mini Host/Device) according to the datasheet (page 8-12). It connects to VBUS_UC, which connects to a transistor-based detection circuit (Q8) that monitors USB bus power presence. This is the correct connection for USB VBUS detection, allowing the microcontroller to sense when USB power is available.VBG pin correctly connected to bias voltage reference circuit with external components.
Pin 40 is VBG (Bias Voltage Reference) according to the datasheet (page 8-12). It connects to NetC49_1, which has a 10pF capacitor (C49) and 6.8k resistor (R49) to ground. This is a typical bias voltage reference circuit configuration. The external components provide proper decoupling and biasing for the internal voltage reference, which is used by analog circuits like the ADC.DFSDP and DFSDM pins connected through series resistors to the same nets as high speed USB data lines. This unusual configuration may be intentional for dual transceiver operation.
Pin 42 is DFSDP (USB Full Speed Data +) and pin 43 is DFSDM (USB Full Speed Data -) according to the datasheet (page 8-12). These connect through 24-ohm resistors R48 and R42 respectively to UMCU_P and UMCU_N, which are the same nets that the high speed USB data lines (DHSDP/DHSDM) connect to directly. This is an unusual configuration as typically only one set of USB transceivers (either high speed or full speed) would be active at a time. However, the deliberate use of specific series resistor values suggests this may be an intentional design choice for a particular USB implementation requiring both transceivers to be connected. The series resistors would provide some isolation between the two transceiver outputs.DFSDP and DFSDM pins connected through series resistors to the same nets as high speed USB data lines. This unusual configuration may be intentional for dual transceiver operation.
Pin 42 is DFSDP (USB Full Speed Data +) and pin 43 is DFSDM (USB Full Speed Data -) according to the datasheet (page 8-12). These connect through 24-ohm resistors R48 and R42 respectively to UMCU_P and UMCU_N, which are the same nets that the high speed USB data lines (DHSDP/DHSDM) connect to directly. This is an unusual configuration as typically only one set of USB transceivers (either high speed or full speed) would be active at a time. However, the deliberate use of specific series resistor values suggests this may be an intentional design choice for a particular USB implementation requiring both transceivers to be connected. The series resistors would provide some isolation between the two transceiver outputs.JTAGSEL pin correctly connected to ground for normal operation.
Pin 46 is JTAGSEL (JTAG Selection, permanent internal pull-down) according to the datasheet (page 8-12). It is connected to GND, which is the correct connection for normal operation when JTAG debugging is not required. The datasheet specifies this pin has a permanent internal pull-down, so connecting it to ground ensures JTAG mode is disabled.NRSTB pin correctly connected to reset signal.
Pin 47 is NRSTB (Asynchronous Microcontroller Reset, pull-up resistor) according to the datasheet (page 8-12). It connects to the RESET net, which is part of the system reset circuitry. This is the correct connection for the asynchronous reset input. The datasheet indicates this pin has an internal pull-up resistor, and it should be connected to the system reset circuit.XIN32 pin correctly connected to 32kHz slow clock oscillator input.
Pin 48 is XIN32 (Slow Clock Oscillator Input) according to the datasheet (page 8-12). It connects to the XIN32 net, which is part of the 32kHz crystal oscillator circuit used for low-power operation and real-time clock functions. This is the correct connection for the slow clock input.XOUT32 pin correctly connected to 32kHz slow clock oscillator output.
Pin 49 is XOUT32 (Slow Clock Oscillator Output) according to the datasheet (page 8-12). It connects to the XOUT32 net, which is part of the 32kHz crystal oscillator circuit. This is the correct connection for the slow clock output, complementing the XIN32 input to form the complete 32kHz oscillator circuit.SHDN pin correctly connected to shutdown control signal.
Pin 50 is SHDN (Shut-Down Control, 0: Device is in backup mode, 1: Device is running) according to the datasheet (page 8-12). It connects to the SHDN net, which is used for power management and backup mode control. This is the correct connection for shutdown control functionality.TST pin correctly connected to ground for normal operation.
Pin 51 is TST (Test Mode Select, pull-down resistor) according to the datasheet (page 8-12). It is connected to GND, which is the correct connection for normal operation. The datasheet specifies this pin has a pull-down resistor, and connecting it to ground ensures test mode is disabled during normal operation.FWUP pin correctly connected to external pull-up resistor for force wake-up functionality.
Pin 53 is FWUP (Force Wake-up, needs external pull-up) according to the datasheet (page 8-12). It connects to NetR51_1, which has a 100k pull-up resistor (R51) to +3.3VCC. This is the correct connection as the datasheet specifically states this pin needs an external pull-up. The 100k value is appropriate for this function.NRST pin correctly connected to reset circuit with external components.
Pin 69 is NRST (Microcontroller Reset, pull-up resistor) according to the datasheet (page 8-12). It connects to NetC169_1, which has a reset circuit consisting of capacitor C169 and resistor R149. This is a typical reset circuit configuration. The datasheet indicates this pin has an internal pull-up resistor, and the external components provide proper reset timing and filtering.ADVREF pin correctly connected to analog power supply for ADC/DAC reference.
Pin 75 is ADVREF (ADC and DAC Reference) according to the datasheet (page 8-12). It is connected to VDDANA (analog power supply). This is the correct connection for providing a stable reference voltage to the ADC and DAC circuits. Connecting the reference to the clean analog power supply ensures good analog performance.X1 - 405C35B12M00000 ✅
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Crystal terminal correctly connected to microcontroller XIN pin.
Pin 1 is a crystal connection terminal according to the datasheet (page 3). It connects to NetC42_2, which connects to U11B pin 36 (XIN). This is the correct connection for one terminal of the 12MHz crystal oscillator circuit. The crystal provides the main clock reference for the microcontroller.Ground terminal correctly connected to circuit ground.
Pin 2 is a ground terminal according to the datasheet (page 3), connected internally to pins 4 and metal lid. It is connected to GND, which is the correct connection. The datasheet notes this may be connected to circuit ground for EMI suppression, which is being done here.Crystal terminal correctly connected to microcontroller XOUT pin.
Pin 3 is a crystal connection terminal according to the datasheet (page 3). It connects to NetC41_2, which connects to U11B pin 35 (XOUT). This is the correct connection for the other terminal of the 12MHz crystal oscillator circuit, completing the oscillator feedback loop.Ground terminal correctly connected to circuit ground.
Pin 4 is a ground terminal according to the datasheet (page 3), connected internally to pins 2 and metal lid. It is connected to GND, which is the correct connection. This provides additional grounding for EMI suppression as recommended in the datasheet.Q8 - MMBT3904_SOT523 ✅
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Base terminal correctly connected to optoisolator collector output with pull-up resistor for switching control.
Pin 1 is the base terminal of the NPN transistor per the datasheet (page 1). It connects to net NetQ8_1, which is shared with U18 pin 4 (optoisolator collector) and R151 pin 1 (6.8K pull-up to +5VCC). This configuration allows the optoisolator to control the transistor: when the optoisolator phototransistor is off, R151 pulls the base high turning on Q8; when the phototransistor conducts, it pulls the base low turning off Q8. This is a standard optoisolator-driven switching configuration and is correctly implemented.Emitter terminal correctly connected to ground for common-emitter NPN configuration.
Pin 2 is the emitter terminal per the datasheet (page 1). It connects to the main system ground net GND. This is the correct configuration for an NPN transistor in common-emitter mode, where the emitter is typically connected to the most negative supply (ground). When the transistor turns on, current flows from collector to emitter, effectively connecting the collector (VBUS_UC) to ground through the low resistance collector-emitter path.Collector terminal correctly connected to VBUS_UC signal for switching the microcontroller's USB power detection input.
Pin 3 is the collector terminal per the datasheet (page 1). It connects to net VBUS_UC, which goes to U11B pin 39 (VBUS pin of the microcontroller) and has a 6.8K pull-up resistor R150 to +5VCC. This creates an inverted logic output: when Q8 is off (USB power present), R150 pulls VBUS_UC high; when Q8 is on (USB power absent), the collector-emitter path pulls VBUS_UC low. This provides the microcontroller with a digital signal indicating USB power status, which is the intended function of this power detection circuit.U18 - OPTO SO-4 OPNDRN OUT ✅
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LED anode correctly connected through current limiting resistor to USB power for power detection.
Pin 1 is the LED anode input per the datasheet (page 1). It connects to net NetR152_2, which is the output of current limiting resistor R152 (1K) connected to VUSB. This provides the forward current path for the optoisolator's internal LED. When VUSB is present, current flows through R152 and the LED (from anode to cathode), activating the optical coupling. The 1K resistance provides appropriate current limiting for the LED, which is a standard value for optoisolator drive circuits.LED cathode correctly connected to USB ground for completing the LED current path in the isolated domain.
Pin 2 is the LED cathode input per the datasheet (page 1). It connects to USB_GND, which is the ground reference for the USB power domain. This completes the current path for the LED: VUSB → R152 → LED anode (pin 1) → LED cathode (pin 2) → USB_GND. The connection to USB_GND rather than the main system GND maintains the galvanic isolation between the USB side and system side, which is the primary purpose of using an optoisolator in this application.Phototransistor emitter correctly connected to system ground for the isolated output stage.
Pin 3 is the phototransistor emitter per the datasheet (page 1). It connects to the main system ground net GND. This is the correct connection for the output side of the optoisolator, providing the ground reference for the phototransistor in the isolated domain. When the LED is activated, the phototransistor conducts, allowing current to flow from collector (pin 4) to emitter (pin 3) to ground, effectively pulling the collector low.Phototransistor collector correctly connected to transistor base with pull-up for controlling the power switching circuit.
Pin 4 is the phototransistor collector per the datasheet (page 1). It connects to net NetQ8_1, which is shared with Q8 pin 1 (transistor base) and R151 pin 1 (6.8K pull-up to +5VCC). This creates the control logic: when the optoisolator LED is off (no USB power), the phototransistor is off, so R151 pulls the base of Q8 high, turning it on; when the LED is on (USB power present), the phototransistor conducts, pulling the base of Q8 low, turning it off. This implements the desired inverted logic for USB power detection with proper isolation between domains.R152 - RK73H1ETTP1001F ✅
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Correctly connected to VUSB to provide current source for optoisolator LED.
Pin 1 connects to VUSB, which is the USB power rail derived from the USB connector through isolation and filtering components. This provides the voltage source for driving the optoisolator LED. VUSB is connected to various USB power management components including the USB isolator U9, filtering capacitors, and power selection jumper JP1. The connection is correct for providing power to the LED current limiting circuit.Correctly connected to optoisolator LED anode to provide current-limited drive signal.
Pin 2 connects to net NetR152_2, which goes directly to U18 pin 1 (optoisolator LED anode). This completes the current limiting function: VUSB → R152 pin 1 → R152 pin 2 → U18 pin 1 (LED anode). The 1K resistance value is appropriate for limiting LED current to a safe operating level while providing sufficient drive for reliable optoisolator operation. Per the datasheet (page 2), this is a standard 1% tolerance thick film resistor suitable for this application.D26 - RSB39VTE-17 ✅
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Anode connected to system ground (GND) for bidirectional ESD protection between ground domains.
Pin A (Anode) is connected to the GND net, which serves as the main system ground domain. This net connects to the isolated side of the USB isolator U9 (pins 9,15 GND2), microcontroller U11B ground pins (46,51), and various decoupling capacitors. According to the datasheet (page 1), this pin functions as a 'Bidirectional ESD protection terminal'. The RSB39VTE-17 is described as a bidirectional TVS diode with zener voltage 35.1V to 42.9V at IZ=1mA, designed for ESD protection. In this application, it provides ESD protection between the isolated USB ground domain and the system ground domain, which is appropriate for the isolated USB interface implemented with the ADuM3160 isolator. The bidirectional nature means polarity is not critical for functionality.Cathode connected to USB ground (USB_GND) for bidirectional ESD protection between ground domains.
Pin C (Cathode) is connected to the USB_GND net, which serves as the ground domain for the USB side of the circuit. This net connects to the USB connector J8 ground pins (4,5,6), the non-isolated side of USB isolator U9 (pins 2,8 GND1), USB-side decoupling capacitors (C28, C32, C39), and ESD protection components (D27). According to the datasheet (page 1), this pin functions as a 'Bidirectional ESD protection terminal'. The connection implements ESD protection between the USB_GND and system GND domains, which is essential in isolated USB systems to prevent damage from ESD events while maintaining galvanic isolation. The RSB39VTE-17's bidirectional characteristics with identical performance in both directions make it suitable for this application where ESD events can occur from either domain.U11A - ATML-ATSAM3X-LQFP-144 ❌
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PB29 and PB30 pins have swapped TDI and TDO connections, preventing proper JTAG functionality.
PB29 and PB30 pins have swapped TDI and TDO connections, preventing proper JTAG functionality.
PB26 pin correctly connected to STEP6 signal for stepper motor control.
Pin 1 is PB26/CTS0/TCLK0/WKUP15 according to the datasheet (page 8-12) and connects to net STEP6. This appears to be used as a stepper motor step signal, which is appropriate for PB26 as it can function as a timer clock input (TCLK0) or general I/O. The connection is functionally correct for a 3D printer controller application.PA9 pin correctly connected to UART transmit signal PA9_UTXD.
Pin 2 is PA9/UTXD/PWMH3 according to the datasheet (page 8-12) and connects to net PA9_UTXD. PA9 has UTXD (UART Transmit Data) functionality, so connecting it to a UTXD signal is correct. This follows the datasheet specification for UART communication.PA10 pin connected to DIAG7 signal, used for diagnostic purposes.
Pin 3 is PA10/RXD0/DATRG/WKUP5 according to the datasheet (page 8-12) and connects to net DIAG7. PA10 can function as RXD0 (USART0 receive) or general I/O. Using it as a diagnostic signal is a valid application, though it means USART0 receive functionality is not being used.PA11 pin connected to DIAG8 signal, used for diagnostic purposes.
Pin 4 is PA11/TXD0/ADTRG/WKUP6 according to the datasheet (page 8-12) and connects to net DIAG8. PA11 can function as TXD0 (USART0 transmit) or ADTRG (ADC trigger) or general I/O. Using it as a diagnostic signal is valid, though it means USART0 transmit functionality is not being used.PA12 pin correctly connected to USART1 receive signal PA12_RXD1.
Pin 5 is PA12/RXD1/PWML1/WKUP7 according to the datasheet (page 8-12) and connects to net PA12_RXD1. PA12 has RXD1 (USART1 Receive Data) functionality, so this connection is correct for USART1 communication.PA13 pin correctly connected to USART1 transmit signal PA13_TXD1.
Pin 6 is PA13/TXD1/PWMH2 according to the datasheet (page 8-12) and connects to net PA13_TXD1. PA13 has TXD1 (USART1 Transmit Data) functionality, so this connection is correct for USART1 communication.PA14 pin correctly connected to USART1 RTS signal PA14_RTS1.
Pin 7 is PA14/RTS1/TK according to the datasheet (page 8-12) and connects to net PA14_RTS1. PA14 has RTS1 (USART1 Request To Send) functionality, so this connection is correct for USART1 flow control.PA15 pin correctly connected to USART1 CTS signal PA15_CTS1.
Pin 8 is PA15/CTS1/TF/WKUP8 according to the datasheet (page 8-12) and connects to net PA15_CTS1. PA15 has CTS1 (USART1 Clear To Send) functionality, so this connection is correct for USART1 flow control.PA17 pin correctly connected to I2C SDA signal PA17_SDA.
Pin 9 is PA17/TWD0/SPCK0 according to the datasheet (page 8-12) and connects to net PA17_SDA. PA17 has TWD0 (TWI0 Two-wire Serial Data) functionality, which is I2C SDA. This connection is correct for I2C communication.PD0 pin connected to M_nCS7 signal for chip select functionality.
Pin 13 is PD0/A10/MCDA4 according to the datasheet (page 8-12) and connects to net M_nCS7. PD0 can function as address line A10 or general I/O. Using it as a chip select signal (M_nCS7) is appropriate for SPI device selection in a motor controller context.PD1 pin connected to DIR8 signal for motor direction control.
Pin 14 is PD1/A11/MCDA5 according to the datasheet (page 8-12) and connects to net DIR8. PD1 can function as address line A11 or general I/O. Using it as a direction signal (DIR8) for stepper motor control is appropriate.PD2 pin connected to M_nCS8 signal for chip select functionality.
Pin 15 is PD2/A12/MCDA6 according to the datasheet (page 8-12) and connects to net M_nCS8. PD2 can function as address line A12 or general I/O. Using it as a chip select signal (M_nCS8) is appropriate for SPI device selection.PD3 pin connected to STEP8 signal for stepper motor control.
Pin 16 is PD3/A13/MCDA7 according to the datasheet (page 8-12) and connects to net STEP8. PD3 can function as address line A13 or general I/O. Using it as a step signal (STEP8) for stepper motor control is appropriate.PD4 pin connected to MIN_ES1 signal for endstop input.
Pin 17 is PD4/A14/TXD3 according to the datasheet (page 8-12) and connects to net MIN_ES1. PD4 can function as address line A14, TXD3, or general I/O. Using it as a minimum endstop input (MIN_ES1) is appropriate for 3D printer limit switch functionality.PD5 pin connected to MAX_ES2 signal for endstop input.
Pin 18 is PD5/A15/RXD3 according to the datasheet (page 8-12) and connects to net MAX_ES2. PD5 can function as address line A15, RXD3, or general I/O. Using it as a maximum endstop input (MAX_ES2) is appropriate for 3D printer limit switch functionality.PD6 pin connected to MIN_ES2 signal for endstop input.
Pin 19 is PD6/A16/BA0/PWMFI2 according to the datasheet (page 8-12) and connects to net MIN_ES2. PD6 can function as address line A16, bank select BA0, PWM fault input, or general I/O. Using it as a minimum endstop input (MIN_ES2) is appropriate.PD7 pin connected to TACH_3 signal for fan tachometer input.
Pin 20 is PD7/A17/BA1/TIOA8 according to the datasheet (page 8-12) and connects to net TACH_3. PD7 can function as address line A17, bank select BA1, timer I/O TIOA8, or general I/O. Using it as a tachometer input (TACH_3) is appropriate for fan speed monitoring.PD8 pin connected to TACH_2 signal for fan tachometer input.
Pin 21 is PD8/A21/NANDALE/TIOB8 according to the datasheet (page 8-12) and connects to net TACH_2. PD8 can function as address line A21, NAND ALE, timer I/O TIOB8, or general I/O. Using it as a tachometer input (TACH_2) is appropriate for fan speed monitoring.PD9 pin connected to MAX_ES3 signal for endstop input.
Pin 22 is PD9/A22/NANDCLE/TCLK8 according to the datasheet (page 8-12) and connects to net MAX_ES3. PD9 can function as address line A22, NAND CLE, timer clock TCLK8, or general I/O. Using it as a maximum endstop input (MAX_ES3) is appropriate.PA0 pin correctly connected to CAN transmit signal PA0_CANTX0.
Pin 23 is PA0/CANTX0/PWML3 according to the datasheet (page 8-12) and connects to net PA0_CANTX0. PA0 has CANTX0 (CAN Controller 0 Transmit) functionality, so this connection is correct for CAN communication.PA1 pin correctly connected to CAN receive signal PA1_CANRX0.
Pin 24 is PA1/CANRX0/PCK0/WKUP0 according to the datasheet (page 8-12) and connects to net PA1_CANRX0. PA1 has CANRX0 (CAN Controller 0 Receive) functionality, so this connection is correct for CAN communication.PA5 pin connected to PA5_PWM signal for PWM output.
Pin 25 is PA5/TIOA2/PWMFI0/WKUP2 according to the datasheet (page 8-12) and connects to net PA5_PWM. PA5 can function as timer I/O TIOA2, PWM fault input, or general I/O. Using it as a PWM signal is appropriate, likely utilizing the TIOA2 timer functionality.PA7 pin connected to MIN_ES3 signal for endstop input.
Pin 26 is PA7/TCLK2/NCS1/WKUP3 according to the datasheet (page 8-12) and connects to net MIN_ES3. PA7 can function as timer clock TCLK2, chip select NCS1, or general I/O. Using it as a minimum endstop input (MIN_ES3) is appropriate.PA8 pin correctly connected to UART receive signal PA8_URXD.
Pin 27 is PA8/URXD/PWMH0/WKUP4 according to the datasheet (page 8-12) and connects to net PA8_URXD. PA8 has URXD (UART Receive Data) functionality, so this connection is correct for UART communication.PB28 pin correctly connected to JTAG/SWD clock signal TCK/SWDCLK.
Pin 28 is PB28/TCK/SWCLK according to the datasheet (page 8-12) and connects to net TCK/SWDCLK. PB28 has TCK/SWCLK (Test Clock/Serial Wire Clock) functionality, so this connection is correct for JTAG/SWD debugging interface.PB31 pin correctly connected to JTAG/SWD data signal TMS/SWDIO.
Pin 31 is PB31/TMS/SWDIO according to the datasheet (page 8-12) and connects to net TMS/SWDIO. PB31 has TMS/SWDIO (Test Mode Select/Serial Wire Data I/O) functionality, so this connection is correct for JTAG/SWD debugging interface.PD10 pin connected to MAX_ES1 signal for endstop input.
Pin 32 is PD10/NWR1/NBS1 according to the datasheet (page 8-12) and connects to net MAX_ES1. PD10 can function as write signal NWR1, byte select NBS1, or general I/O. Using it as a maximum endstop input (MAX_ES1) is appropriate for 3D printer limit switch functionality.PC1 pin connected to LED_Y signal for yellow LED control.
Pin 55 is PC1 according to the datasheet (page 8-12) and connects to net LED_Y. PC1 is a general purpose I/O pin, so using it to control a yellow LED is appropriate.PC2 pin connected to PC2_PWML0 signal for PWM output.
Pin 59 is PC2/D0/PWML0 according to the datasheet (page 8-12) and connects to net PC2_PWML0. PC2 has PWML0 (PWM Low output for channel 0) functionality, so this connection is correct for PWM generation.PC3 pin connected to LED_R signal for red LED control.
Pin 60 is PC3/D1/PWMH0 according to the datasheet (page 8-12) and connects to net LED_R. PC3 can function as data line D1, PWM high output PWMH0, or general I/O. Using it to control a red LED is appropriate.PC5 pin connected to DIAG1 signal for diagnostic purposes.
Pin 63 is PC5/D3/PWMH1 according to the datasheet (page 8-12) and connects to net DIAG1. PC5 can function as data line D3, PWM high output PWMH1, or general I/O. Using it as a diagnostic signal is appropriate.PC6 pin connected to DIR1 signal for motor direction control.
Pin 64 is PC6/D4/PWML2 according to the datasheet (page 8-12) and connects to net DIR1. PC6 can function as data line D4, PWM low output PWML2, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PC7 pin connected to STEP1 signal for stepper motor control.
Pin 65 is PC7/D5/PWMH2 according to the datasheet (page 8-12) and connects to net STEP1. PC7 can function as data line D5, PWM high output PWMH2, or general I/O. Using it as a step signal for stepper motor control is appropriate.PC8 pin connected to PC8_PWML3 signal for PWM output.
Pin 66 is PC8/D6/PWML3 according to the datasheet (page 8-12) and connects to net PC8_PWML3. PC8 has PWML3 (PWM Low output for channel 3) functionality, so this connection is correct for PWM generation.PC9 pin connected to DRV_EN signal for driver enable control.
Pin 67 is PC9/D7/PWMH3 according to the datasheet (page 8-12) and connects to net DRV_EN. PC9 can function as data line D7, PWM high output PWMH3, or general I/O. Using it as a driver enable signal is appropriate for motor driver control.PB27 pin connected to PB27_TIOB0 signal for timer I/O functionality.
Pin 68 is PB27/NCS3/TIOB0 according to the datasheet (page 8-12) and connects to net PB27_TIOB0. PB27 has TIOB0 (Timer Counter Channel 0 I/O Line B) functionality, so this connection is correct for timer-based operations.PA18 pin correctly connected to I2C SCL signal PA18_SCL.
Pin 70 is PA18/TWCK0/A20/WKUP9 according to the datasheet (page 8-12) and connects to net PA18_SCL. PA18 has TWCK0 (TWI0 Two-wire Serial Clock) functionality, which is I2C SCL. This connection is correct for I2C communication.PA19 pin correctly connected to multimedia card clock signal MCCK.
Pin 71 is PA19/MCCK/PWMH1 according to the datasheet (page 8-12) and connects to net MCCK. PA19 has MCCK (Multimedia Card Clock) functionality, so this connection is correct for SD card interface.PA20 pin correctly connected to multimedia card command signal MCCDA.
Pin 72 is PA20/MCCDA/PWML2 according to the datasheet (page 8-12) and connects to net MCCDA. PA20 has MCCDA (Multimedia Card Slot A Command) functionality, so this connection is correct for SD card interface.PB15 pin connected to Fan3 signal, utilizing DAC0 functionality for fan control.
Pin 76 is PB15/CANRX1/PWMH3/DAC0/WKUP12 according to the datasheet (page 8-12) and connects to net Fan3. PB15 has DAC0 (DAC channel 0 analog output) functionality, which could be used for analog fan control. This is an appropriate use of the DAC output for variable fan speed control.PB16 pin connected to Fan4 signal, utilizing DAC1 functionality for fan control.
Pin 77 is PB16/TCLK5/PWML0/DAC1 according to the datasheet (page 8-12) and connects to net Fan4. PB16 has DAC1 (DAC channel 1 analog output) functionality, which could be used for analog fan control. This is an appropriate use of the DAC output for variable fan speed control.PA16 pin connected to PA16 signal for general I/O functionality.
Pin 78 is PA16/SPCK1/TD/AD7 according to the datasheet (page 8-12) and connects to net PA16. PA16 can function as SPI clock SPCK1, SSC transmit data TD, ADC input AD7, or general I/O. Using it as general I/O is appropriate.PA24 pin correctly connected to multimedia card data signal MCDA3.
Pin 79 is PA24/MCDA3/PCK1/AD6 according to the datasheet (page 8-12) and connects to net MCDA3. PA24 has MCDA3 (Multimedia Card Slot A Data 3) functionality, so this connection is correct for SD card interface.PA23 pin correctly connected to multimedia card data signal MCDA2.
Pin 80 is PA23/MCDA2/TCLK4/AD5 according to the datasheet (page 8-12) and connects to net MCDA2. PA23 has MCDA2 (Multimedia Card Slot A Data 2) functionality, so this connection is correct for SD card interface.PA22 pin correctly connected to multimedia card data signal MCDA1.
Pin 81 is PA22/MCDA1/TCLK3/AD4 according to the datasheet (page 8-12) and connects to net MCDA1. PA22 has MCDA1 (Multimedia Card Slot A Data 1) functionality, so this connection is correct for SD card interface.PA6 pin connected to TC_nCS3 signal for chip select functionality.
Pin 82 is PA6/TIOB2/NCS0/AD3 according to the datasheet (page 8-12) and connects to net TC_nCS3. PA6 can function as timer I/O TIOB2, chip select NCS0, ADC input AD3, or general I/O. Using it as a thermocouple chip select (TC_nCS3) is appropriate for SPI device selection.PA4 pin connected to M_nCS1 signal for chip select functionality.
Pin 83 is PA4/TCLK1/NWAIT/AD2 according to the datasheet (page 8-12) and connects to net M_nCS1. PA4 can function as timer clock TCLK1, wait signal NWAIT, ADC input AD2, or general I/O. Using it as a motor chip select (M_nCS1) is appropriate for SPI device selection.PA3 pin connected to PA3_AD2 signal for ADC input functionality.
Pin 84 is PA3/TIOB1/PWMFI1/AD1/WKUP1 according to the datasheet (page 8-12) and connects to net PA3_AD2. PA3 has AD1 (ADC input 1) functionality, and the net name suggests ADC channel 2 usage. This connection is appropriate for analog input measurement.PA2 pin connected to TC_nCS4 signal for chip select functionality.
Pin 85 is PA2/TIOA1/NANDRDY/AD0 according to the datasheet (page 8-12) and connects to net TC_nCS4. PA2 can function as timer I/O TIOA1, NAND ready signal, ADC input AD0, or general I/O. Using it as a thermocouple chip select (TC_nCS4) is appropriate for SPI device selection.PB12 pin connected to PB12_AD8 signal for ADC input functionality.
Pin 86 is PB12/TWD1/PWMH0/AD8 according to the datasheet (page 8-12) and connects to net PB12_AD8. PB12 has AD8 (ADC input 8) functionality, so this connection is correct for analog input measurement.PB13 pin connected to PB13_AD9 signal for ADC input functionality.
Pin 87 is PB13/TWCK1/PWMH1/AD9 according to the datasheet (page 8-12) and connects to net PB13_AD9. PB13 has AD9 (ADC input 9) functionality, so this connection is correct for analog input measurement.PB17 pin connected to TC_nCS5 signal for chip select functionality.
Pin 88 is PB17/RF/PWML1/AD10 according to the datasheet (page 8-12) and connects to net TC_nCS5. PB17 can function as SSC receive frame sync RF, PWM low output PWML1, ADC input AD10, or general I/O. Using it as a thermocouple chip select (TC_nCS5) is appropriate.PB18 pin connected to THERM_AN2 signal for thermistor analog input.
Pin 89 is PB18/RD/PWML2/AD11 according to the datasheet (page 8-12) and connects to net THERM_AN2. PB18 has AD11 (ADC input 11) functionality, so using it for thermistor analog input (THERM_AN2) is correct for temperature measurement.PB19 pin connected to THERM_AN1 signal for thermistor analog input.
Pin 90 is PB19/RK/PWML3/AD12 according to the datasheet (page 8-12) and connects to net THERM_AN1. PB19 has AD12 (ADC input 12) functionality, so using it for thermistor analog input (THERM_AN1) is correct for temperature measurement.PB20 pin connected to THERM_AN3 signal for thermistor analog input.
Pin 91 is PB20/TXD2/SPI0_NPCS1/AD13 according to the datasheet (page 8-12) and connects to net THERM_AN3. PB20 has AD13 (ADC input 13) functionality, so using it for thermistor analog input (THERM_AN3) is correct for temperature measurement.PB21 pin connected to SPIFLASH_CS signal for SPI flash chip select.
Pin 92 is PB21/RXD2/SPI0_NPCS2/AD14/WKUP13 according to the datasheet (page 8-12) and connects to net SPIFLASH_CS. PB21 has SPI0_NPCS2 (SPI Peripheral Chip Select 2) functionality, so using it as SPI flash chip select is appropriate and follows the intended SPI functionality.PC11 pin connected to DIAG2 signal for diagnostic purposes.
Pin 93 is PC11/D9/ERX2 according to the datasheet (page 8-12) and connects to net DIAG2. PC11 can function as data line D9, Ethernet receive data ERX2, or general I/O. Using it as a diagnostic signal is appropriate.PC12 pin connected to DIR2 signal for motor direction control.
Pin 94 is PC12/D10/ERX3 according to the datasheet (page 8-12) and connects to net DIR2. PC12 can function as data line D10, Ethernet receive data ERX3, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PC13 pin connected to STEP2 signal for stepper motor control.
Pin 95 is PC13/D11/ECOL according to the datasheet (page 8-12) and connects to net STEP2. PC13 can function as data line D11, Ethernet collision detect ECOL, or general I/O. Using it as a step signal for stepper motor control is appropriate.PC14 pin connected to M_nCS2 signal for chip select functionality.
Pin 96 is PC14/D12/ERXCK according to the datasheet (page 8-12) and connects to net M_nCS2. PC14 can function as data line D12, Ethernet receive clock ERXCK, or general I/O. Using it as a motor chip select (M_nCS2) is appropriate for SPI device selection.PC15 pin connected to DIAG3 signal for diagnostic purposes.
Pin 97 is PC15/D13/ETX2 according to the datasheet (page 8-12) and connects to net DIAG3. PC15 can function as data line D13, Ethernet transmit data ETX2, or general I/O. Using it as a diagnostic signal is appropriate.PC16 pin connected to DIR3 signal for motor direction control.
Pin 98 is PC16/D14/ETX3 according to the datasheet (page 8-12) and connects to net DIR3. PC16 can function as data line D14, Ethernet transmit data ETX3, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PC17 pin connected to STEP3 signal for stepper motor control.
Pin 99 is PC17/D15/ETXER according to the datasheet (page 8-12) and connects to net STEP3. PC17 can function as data line D15, Ethernet transmit error ETXER, or general I/O. Using it as a step signal for stepper motor control is appropriate.PC18 pin connected to M_nCS3 signal for chip select functionality.
Pin 100 is PC18/NWR0/NWE/PWMH6 according to the datasheet (page 8-12) and connects to net M_nCS3. PC18 can function as write signal NWR0/NWE, PWM high output PWMH6, or general I/O. Using it as a motor chip select (M_nCS3) is appropriate for SPI device selection.PC19 pin connected to DIAG4 signal for diagnostic purposes.
Pin 101 is PC19/NANDOE/PWMH5 according to the datasheet (page 8-12) and connects to net DIAG4. PC19 can function as NAND output enable, PWM high output PWMH5, or general I/O. Using it as a diagnostic signal is appropriate.PC29 pin connected to TACH_4 signal for fan tachometer input.
Pin 102 is PC29/A8/TIOB7 according to the datasheet (page 8-12) and connects to net TACH_4. PC29 can function as address line A8, timer I/O TIOB7, or general I/O. Using it as a tachometer input (TACH_4) is appropriate, and the TIOB7 functionality could be used for frequency measurement.PC30 pin connected to HOLD# signal for SPI flash hold functionality.
Pin 103 is PC30/A9/TCLK7 according to the datasheet (page 8-12) and connects to net HOLD#. PC30 can function as address line A9, timer clock TCLK7, or general I/O. Using it as a hold signal for SPI flash is appropriate for SPI flash control.PA21 pin correctly connected to multimedia card data signal MCDA0.
Pin 107 is PA21/MCDA0/PWML0 according to the datasheet (page 8-12) and connects to net MCDA0. PA21 has MCDA0 (Multimedia Card Slot A Data 0) functionality, so this connection is correct for SD card interface.PA25 pin connected through series resistor to SPI MISO functionality.
Pin 108 is PA25/SPI0_MISO/A18 according to the datasheet (page 8-12) and connects to net NetR83_2. PA25 has SPI0_MISO (SPI Master In Slave Out) functionality. The connection goes through resistor R83 (24 ohm series resistor) which is appropriate for signal integrity on SPI lines. This is correct for SPI communication.PA26 pin connected through series resistor to SPI MOSI functionality.
Pin 109 is PA26/SPI0_MOSI/A19 according to the datasheet (page 8-12) and connects to net NetR77_2. PA26 has SPI0_MOSI (SPI Master Out Slave In) functionality. The connection goes through resistor R77 (24 ohm series resistor) which is appropriate for signal integrity on SPI lines. This is correct for SPI communication.PA27 pin connected through series resistor to SPI clock functionality.
Pin 110 is PA27/SPI0_SPCK/A20/WKUP10 according to the datasheet (page 8-12) and connects to net NetR82_2. PA27 has SPI0_SPCK (SPI Serial Clock) functionality. The connection goes through resistor R82 (24 ohm series resistor) which is appropriate for signal integrity on SPI clock lines. This is correct for SPI communication.PA28 pin correctly connected to SPI chip select signal PA28_CS0.
Pin 111 is PA28/SPI0_NPCS0/PCK2/WKUP11 according to the datasheet (page 8-12) and connects to net PA28_CS0. PA28 has SPI0_NPCS0 (SPI Peripheral Chip Select 0) functionality, so this connection is correct for SPI chip select.PA29 pin connected to PA29_CS signal for chip select functionality.
Pin 112 is PA29/SPI0_NPCS1/NRD according to the datasheet (page 8-12) and connects to net PA29_CS. PA29 has SPI0_NPCS1 (SPI Peripheral Chip Select 1) functionality, so using it as a chip select signal is appropriate.PB0 pin connected to PB0_ETXCK signal for Ethernet transmit clock.
Pin 113 is PB0/ETXCK/EREFCK according to the datasheet (page 8-12) and connects to net PB0_ETXCK. PB0 has ETXCK (Ethernet Transmit Clock) functionality, so this connection is correct for Ethernet interface.PB1 pin connected to PB1_ETXEN signal for Ethernet transmit enable.
Pin 114 is PB1/ETXEN according to the datasheet (page 8-12) and connects to net PB1_ETXEN. PB1 has ETXEN (Ethernet Transmit Enable) functionality, so this connection is correct for Ethernet interface.PB2 pin connected to PB2_ETX0 signal for Ethernet transmit data.
Pin 115 is PB2/ETX0 according to the datasheet (page 8-12) and connects to net PB2_ETX0. PB2 has ETX0 (Ethernet Transmit Data 0) functionality, so this connection is correct for Ethernet interface.PC4 pin connected to DIR4 signal for motor direction control.
Pin 116 is PC4/D2/PWML1 according to the datasheet (page 8-12) and connects to net DIR4. PC4 can function as data line D2, PWM low output PWML1, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PC10 pin connected to STEP4 signal for stepper motor control.
Pin 117 is PC10/D8/ECRS according to the datasheet (page 8-12) and connects to net STEP4. PC10 can function as data line D8, Ethernet carrier sense ECRS, or general I/O. Using it as a step signal for stepper motor control is appropriate.PB3 pin connected to STEP5 signal for stepper motor control.
Pin 118 is PB3/ETX1 according to the datasheet (page 8-12) and connects to net STEP5. PB3 has ETX1 (Ethernet Transmit Data 1) functionality, but is being used as a step signal for stepper motor control. This is acceptable as general I/O usage.PB4 pin connected to M_nCS6 signal for chip select functionality.
Pin 119 is PB4/ECRSDV/ERXDV according to the datasheet (page 8-12) and connects to net M_nCS6. PB4 has Ethernet functionality (ECRSDV/ERXDV), but is being used as a motor chip select signal. This is acceptable as general I/O usage.PB5 pin connected to M_nCS5 signal for chip select functionality.
Pin 120 is PB5/ERX0 according to the datasheet (page 8-12) and connects to net M_nCS5. PB5 has ERX0 (Ethernet Receive Data 0) functionality, but is being used as a motor chip select signal. This is acceptable as general I/O usage.PB6 pin connected to DIR7 signal for motor direction control.
Pin 121 is PB6/ERX1 according to the datasheet (page 8-12) and connects to net DIR7. PB6 has ERX1 (Ethernet Receive Data 1) functionality, but is being used as a direction signal for stepper motor control. This is acceptable as general I/O usage.PB7 pin connected to MAX_ES4 signal for endstop input.
Pin 122 is PB7/ERXER according to the datasheet (page 8-12) and connects to net MAX_ES4. PB7 has ERXER (Ethernet Receive Error) functionality, but is being used as a maximum endstop input. This is acceptable as general I/O usage.PB8 pin connected to STEP7 signal for stepper motor control.
Pin 123 is PB8/EMDC according to the datasheet (page 8-12) and connects to net STEP7. PB8 has EMDC (Ethernet Management Data Clock) functionality, but is being used as a step signal for stepper motor control. This is acceptable as general I/O usage.PB9 pin connected to TC_nCS2 signal for chip select functionality.
Pin 127 is PB9/EMDIO according to the datasheet (page 8-12) and connects to net TC_nCS2. PB9 has EMDIO (Ethernet Management Data I/O) functionality, but is being used as a thermocouple chip select signal. This is acceptable as general I/O usage.PB10 pin connected to M_nCS4 signal for chip select functionality.
Pin 128 is PB10/UOTGVBOF/A18 according to the datasheet (page 8-12) and connects to net M_nCS4. PB10 can function as USB OTG VBus control, address line A18, or general I/O. Using it as a motor chip select signal is appropriate.PB11 pin connected to SDCD signal for SD card detect functionality.
Pin 129 is PB11/UOTGID/A19 according to the datasheet (page 8-12) and connects to net SDCD. PB11 can function as USB OTG ID, address line A19, or general I/O. Using it as SD card detect (SDCD) is appropriate for SD card interface.PC0 pin correctly connected to ERASE signal for flash erase functionality.
Pin 130 is PC0/ERASE according to the datasheet (page 8-12) and connects to net ERASE. PC0 has ERASE (Flash and NVM Configuration Bits Erase Command) functionality, so this connection is correct for flash erase control.PC20 pin connected to DIAG5 signal for diagnostic purposes.
Pin 131 is PC20/NANDWE/PWMH4 according to the datasheet (page 8-12) and connects to net DIAG5. PC20 can function as NAND write enable, PWM high output PWMH4, or general I/O. Using it as a diagnostic signal is appropriate.PC21 pin connected to HEAT1 signal for heater control.
Pin 132 is PC21/A0/NBS0/PWML4 according to the datasheet (page 8-12) and connects to net HEAT1. PC21 can function as address line A0, byte select NBS0, PWM low output PWML4, or general I/O. Using it for heater control (HEAT1) is appropriate, potentially utilizing PWM functionality.PC22 pin connected to HEAT2 signal for heater control.
Pin 133 is PC22/A1/PWML5 according to the datasheet (page 8-12) and connects to net HEAT2. PC22 can function as address line A1, PWM low output PWML5, or general I/O. Using it for heater control (HEAT2) is appropriate, potentially utilizing PWM functionality.PC23 pin connected to HEATBED signal for heated bed control.
Pin 134 is PC23/A2/PWML6 according to the datasheet (page 8-12) and connects to net HEATBED. PC23 can function as address line A2, PWM low output PWML6, or general I/O. Using it for heated bed control is appropriate, potentially utilizing PWM functionality.PC24 pin connected to HEAT3 signal for heater control.
Pin 135 is PC24/A3/PWML7 according to the datasheet (page 8-12) and connects to net HEAT3. PC24 can function as address line A3, PWM low output PWML7, or general I/O. Using it for heater control (HEAT3) is appropriate, potentially utilizing PWM functionality.PC25 pin connected to FAN2 signal for fan control.
Pin 136 is PC25/A4/TIOA6 according to the datasheet (page 8-12) and connects to net FAN2. PC25 can function as address line A4, timer I/O TIOA6, or general I/O. Using it for fan control (FAN2) is appropriate, potentially utilizing timer functionality for PWM generation.PC26 pin connected to FAN1 signal for fan control.
Pin 137 is PC26/A5/TIOB6 according to the datasheet (page 8-12) and connects to net FAN1. PC26 can function as address line A5, timer I/O TIOB6, or general I/O. Using it for fan control (FAN1) is appropriate, potentially utilizing timer functionality for PWM generation.PC27 pin connected to TC_nCS1 signal for chip select functionality.
Pin 138 is PC27/A6/TCLK6 according to the datasheet (page 8-12) and connects to net TC_nCS1. PC27 can function as address line A6, timer clock TCLK6, or general I/O. Using it as a thermocouple chip select (TC_nCS1) is appropriate for SPI device selection.PC28 pin connected to TACH_1 signal for fan tachometer input.
Pin 139 is PC28/A7/TIOA7 according to the datasheet (page 8-12) and connects to net TACH_1. PC28 can function as address line A7, timer I/O TIOA7, or general I/O. Using it as a tachometer input (TACH_1) is appropriate, and the TIOA7 functionality could be used for frequency measurement.PB14 pin connected to MIN_ES4 signal for endstop input.
Pin 140 is PB14/CANTX1/PWMH2 according to the datasheet (page 8-12) and connects to net MIN_ES4. PB14 can function as CAN transmit CANTX1, PWM high output PWMH2, or general I/O. Using it as a minimum endstop input is appropriate.PB22 pin connected to DIR5 signal for motor direction control.
Pin 141 is PB22/RTS2/PCK0 according to the datasheet (page 8-12) and connects to net DIR5. PB22 can function as USART2 RTS, programmable clock PCK0, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PB23 pin connected to DIAG6 signal for diagnostic purposes.
Pin 142 is PB23/CTS2/SPI0_NPCS3/WKUP14 according to the datasheet (page 8-12) and connects to net DIAG6. PB23 can function as USART2 CTS, SPI chip select, or general I/O. Using it as a diagnostic signal is appropriate.PB24 pin connected to DIR6 signal for motor direction control.
Pin 143 is PB24/SCK2/NCS2 according to the datasheet (page 8-12) and connects to net DIR6. PB24 can function as USART2 clock SCK2, chip select NCS2, or general I/O. Using it as a direction signal for stepper motor control is appropriate.PB25 pin connected to PB25_TIOA0 signal for timer I/O functionality.
Pin 144 is PB25/RTS0/TIOA0 according to the datasheet (page 8-12) and connects to net PB25_TIOA0. PB25 has TIOA0 (Timer Counter Channel 0 I/O Line A) functionality, so this connection is correct for timer-based operations.U11C - ATML-ATSAM3X-LQFP-144 ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
VDDCORE pin correctly connected to internal regulator output VDDOUT.
Pin 10 is VDDCORE according to the datasheet (page 8-12) and connects to net VDDOUT. VDDCORE pins should be connected to the voltage regulator output (1.62V to 1.95V) as specified in the datasheet. The connection to VDDOUT is correct as this represents the internal regulator output.VDDIO pin correctly connected to I/O supply voltage 3.3VIO.
Pin 11 is VDDIO according to the datasheet (page 8-12) and connects to net 3.3VIO. VDDIO pins should be connected to the peripherals I/O lines power supply (1.62V to 3.6V) as specified in the datasheet. The connection to 3.3VIO is correct for 3.3V I/O operation.GND pin correctly connected to ground.
Pin 12 is GND according to the datasheet (page 8-12) and connects to net GND. This is the correct connection for ground pins.GNDPLL pin correctly connected to ground.
Pin 33 is GNDPLL according to the datasheet (page 8-12) and connects to net GND. GNDPLL is the PLL A, UPLL and Oscillator Ground, which should be connected to the main ground plane. This connection is correct.VDDPLL pin correctly connected to filtered PLL supply through ferrite bead.
Pin 34 is VDDPLL according to the datasheet (page 8-12) and connects to net VDDPLL. VDDPLL is the PLL A, UPLL and Oscillator Power Supply (1.62V to 1.95V). The net VDDPLL is supplied through ferrite bead FB26 from VDDOUT, which provides noise filtering for the sensitive PLL circuitry. This is correct design practice.VDDUTMI pin correctly connected to filtered USB supply through ferrite bead.
Pin 41 is VDDUTMI according to the datasheet (page 8-12) and connects to net VDDUTMI. VDDUTMI is the USB UTMI+ Interface Power Supply (3.0V to 3.6V). The net VDDUTMI is supplied through ferrite bead FB30 from 3.3VCC, which provides appropriate voltage level and noise filtering for the USB interface. This is correct.GNDUTMI pin correctly connected to ground.
Pin 44 is GNDUTMI according to the datasheet (page 8-12) and connects to net GND. GNDUTMI is the USB UTMI+ Interface Ground, which should be connected to the main ground plane. This connection is correct.VDDCORE pin correctly connected to internal regulator output VDDOUT.
Pin 45 is VDDCORE according to the datasheet (page 8-12) and connects to net VDDOUT. This is another VDDCORE pin that should be connected to the voltage regulator output, which is correct.VDDBU pin correctly connected to backup supply 3.3VCC.
Pin 52 is VDDBU according to the datasheet (page 8-12) and connects to net 3.3VCC. VDDBU is the Backup I/O Lines Power Supply (1.62V to 3.6V). Connecting it to 3.3VCC is appropriate for backup power functionality.GNDBU pin correctly connected to ground.
Pin 54 is GNDBU according to the datasheet (page 8-12) and connects to net GND. GNDBU is the Backup Ground, which should be connected to the main ground plane. This connection is correct.VDDOUT pin correctly connected to regulator output net.
Pin 56 is VDDOUT according to the datasheet (page 8-12) and connects to net VDDOUT. VDDOUT is the Voltage Regulator Output, which should be the source for VDDCORE pins. This connection is correct as it represents the internal regulator output.VDDIN pin correctly connected to main supply 3.3VCC.
Pin 57 is VDDIN according to the datasheet (page 8-12) and connects to net 3.3VCC. VDDIN is the Voltage Regulator, ADC and DAC Power Supply input. Connecting it to the main 3.3V supply is correct for powering the internal voltage regulator and analog circuits.GND pin correctly connected to ground.
Pin 58 is GND according to the datasheet (page 8-12) and connects to net GND. This is the correct connection for ground pins.VDDCORE pin correctly connected to internal regulator output VDDOUT.
Pin 61 is VDDCORE according to the datasheet (page 8-12) and connects to net VDDOUT. This is another VDDCORE pin that should be connected to the voltage regulator output, which is correct.VDDIO pin correctly connected to I/O supply voltage 3.3VIO.
Pin 62 is VDDIO according to the datasheet (page 8-12) and connects to net 3.3VIO. This is another VDDIO pin that should be connected to the I/O supply voltage, which is correct.VDDANA pin correctly connected to filtered analog supply through ferrite bead.
Pin 73 is VDDANA according to the datasheet (page 8-12) and connects to net VDDANA. VDDANA is the ADC and DAC Analog Power Supply (2.0V to 3.6V). The net VDDANA is supplied through ferrite bead FB27 from 3.3VCC, which provides noise filtering for the sensitive analog circuitry. This is correct design practice.GNDANA pin correctly connected to ground.
Pin 74 is GNDANA according to the datasheet (page 8-12) and connects to net GND. GNDANA is the ADC and DAC Analog Ground, which should be connected to the main ground plane. This connection is correct.VDDCORE pin correctly connected to internal regulator output VDDOUT.
Pin 104 is VDDCORE according to the datasheet (page 8-12) and connects to net VDDOUT. This is another VDDCORE pin that should be connected to the voltage regulator output, which is correct.VDDIO pin correctly connected to I/O supply voltage 3.3VIO.
Pin 105 is VDDIO according to the datasheet (page 8-12) and connects to net 3.3VIO. This is another VDDIO pin that should be connected to the I/O supply voltage, which is correct.GND pin correctly connected to ground.
Pin 106 is GND according to the datasheet (page 8-12) and connects to net GND. This is the correct connection for ground pins.VDDCORE pin correctly connected to internal regulator output VDDOUT.
Pin 124 is VDDCORE according to the datasheet (page 8-12) and connects to net VDDOUT. This is another VDDCORE pin that should be connected to the voltage regulator output, which is correct.VDDIO pin correctly connected to I/O supply voltage 3.3VIO.
Pin 125 is VDDIO according to the datasheet (page 8-12) and connects to net 3.3VIO. This is another VDDIO pin that should be connected to the I/O supply voltage, which is correct.GND pin correctly connected to ground.
Pin 126 is GND according to the datasheet (page 8-12) and connects to net GND. This is the correct connection for ground pins.FB26 - FERRITE 120R 3A 0603 ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Ferrite bead input correctly connected to VDDOUT for PLL power filtering.
Pin 1 of FB26 connects to net VDDPLL and pin 2 connects to net VDDOUT. This ferrite bead provides noise filtering between the main regulator output (VDDOUT) and the PLL power supply (VDDPLL). According to the datasheet (page 1), this is a 120 ohm ferrite bead rated for high current applications up to 6A, which is appropriate for power supply filtering. The connection provides clean power to the sensitive PLL circuitry, which is correct design practice.Ferrite bead output correctly connected to VDDPLL for clean PLL power supply.
Pin 2 of FB26 connects to net VDDOUT, providing the filtered power source from the voltage regulator output. This connection is correct as it supplies clean, filtered power to the PLL through the ferrite bead.FB27 - FERRITE 120R 3A 0603 ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Ferrite bead input correctly connected to 3.3VCC for analog power filtering.
Pin 1 of FB27 connects to net 3.3VCC and pin 2 connects to net VDDANA. This ferrite bead provides noise filtering between the main 3.3V supply and the analog power supply (VDDANA). According to the datasheet (page 1), this is a 120 ohm ferrite bead suitable for noise suppression in power lines. This provides clean power to the ADC and DAC analog circuits, which is correct design practice.Ferrite bead output correctly connected to VDDANA for clean analog power supply.
Pin 2 of FB27 connects to net VDDANA, providing filtered power to the analog circuits. This connection is correct as it supplies clean, filtered power to the ADC and DAC through the ferrite bead.FB28 - FERRITE 120R 3A 0603 ✅
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Ferrite bead input correctly connected to 3.3VIO for I/O power filtering.
Pin 1 of FB28 connects to net 3.3VIO and pin 2 connects to net 3.3VCC. This ferrite bead provides noise filtering between the main 3.3V supply and the I/O power supply (3.3VIO). According to the datasheet (page 1), this is a 120 ohm ferrite bead suitable for noise suppression in power lines. This provides clean power to the I/O circuits, which is correct design practice.Ferrite bead output correctly connected to 3.3VCC as the main power source.
Pin 2 of FB28 connects to net 3.3VCC, which serves as the main 3.3V power source. This connection is correct as it provides the source power for the I/O supply filtering.FB30 - FERRITE 120R 3A 0603 ✅
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Ferrite bead input correctly connected to 3.3VCC for USB power filtering.
Pin 1 of FB30 connects to net 3.3VCC and pin 2 connects to net VDDUTMI. This ferrite bead provides noise filtering between the main 3.3V supply and the USB UTMI interface power supply (VDDUTMI). According to the datasheet (page 1), this is a 120 ohm ferrite bead suitable for noise suppression in power lines. This provides clean power to the USB interface circuits, which is correct design practice.Ferrite bead output correctly connected to VDDUTMI for clean USB power supply.
Pin 2 of FB30 connects to net VDDUTMI, providing filtered power to the USB UTMI interface. This connection is correct as it supplies clean, filtered power to the USB circuits through the ferrite bead.J4 - ARM Cortex JTAG-DEBUG Header ✅
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Provides 3.3V reference voltage to the debug interface. This is correctly connected to supply the target voltage reference for the debugger.
Pin 1 is connected to 3.3VCC net, which provides the target voltage reference (VTref) for the debug interface. According to the datasheet (page 3-4), this is a general purpose board-to-board connector. For ARM Cortex debugging, pin 1 typically serves as VTref to inform the debugger of the target's operating voltage. The 3.3VCC connection is correct as it matches the microcontroller's operating voltage and allows the debugger to operate at the appropriate logic levels.Connected to TMS/SWDIO signal for JTAG Test Mode Select or SWD Data I/O. This follows standard ARM debug interface pinout.
Pin 2 connects to the TMS/SWDIO net, which goes to microcontroller pin PB31/TMS/SWDIO. This is the correct connection for ARM Cortex debug interfaces, where pin 2 carries either the Test Mode Select signal for JTAG or the bidirectional Serial Wire Debug Data I/O signal for SWD debugging. The connection follows the standard 10-pin ARM Cortex debug connector specification.Ground connection for the debug interface. This provides proper ground reference for the debugger.
Pin 3 is connected to the GND net, providing ground reference for the debug interface. This is standard practice for debug connectors and ensures proper signal integrity and common ground reference between the debugger and target. The connection is correct according to standard ARM debug connector pinouts.Connected to TCK/SWDCLK signal for JTAG Test Clock or SWD Clock. This follows standard ARM debug interface pinout.
Pin 4 connects to the TCK/SWDCLK net, which goes to microcontroller pin PB28/TCK/SWCLK. This is the correct connection for ARM Cortex debug interfaces, where pin 4 carries either the Test Clock signal for JTAG or the Serial Wire Debug Clock signal for SWD debugging. The connection follows the standard 10-pin ARM Cortex debug connector specification.Ground connection for the debug interface. This provides additional ground reference for signal integrity.
Pin 5 is connected to the GND net, providing an additional ground connection for the debug interface. Multiple ground pins in debug connectors help ensure good signal integrity and reduce ground bounce. This is standard practice and the connection is correct.Connected to TDO/SWO signal for JTAG Test Data Out or SWD Serial Wire Output. This follows standard ARM debug interface pinout.
Pin 6 connects to the TDO/SWO net, which goes to microcontroller pin PB29/TDO/TRACESWO. This is the correct connection for ARM Cortex debug interfaces, where pin 6 carries either the Test Data Out signal for JTAG or the Serial Wire Output signal for SWD trace debugging. The connection follows the standard 10-pin ARM Cortex debug connector specification.Pin is left unconnected. This is acceptable as not all pins in the debug connector need to be used.
Pin 7 is connected to an unconnected net (unconnected-(NetJ4_7)), meaning it is not used. In standard ARM debug connectors, pin 7 is often reserved or used for specific debug features that may not be needed in all applications. Leaving this pin unconnected is acceptable and does not affect the basic debug functionality.Connected to TDI signal for JTAG Test Data In. This follows standard ARM debug interface pinout.
Pin 8 connects to the TDI net, which goes to microcontroller pin PB30/TDI. This is the correct connection for ARM Cortex debug interfaces, where pin 8 carries the Test Data In signal for JTAG debugging. The connection follows the standard 10-pin ARM Cortex debug connector specification.Ground connection for the debug interface. This provides additional ground reference for signal integrity.
Pin 9 is connected to the GND net, providing another ground connection for the debug interface. Multiple ground pins help ensure good signal integrity and proper grounding. This is standard practice for debug connectors and the connection is correct.Connected to RESET signal to provide reset capability to the target. This follows standard debug interface practices.
Pin 10 connects to the RESET net, which allows the debugger to reset the target microcontroller. This is standard practice in ARM debug interfaces where the debugger needs the ability to reset the target for proper debugging operations. The RESET signal connects to the microcontroller's reset circuitry, allowing both manual reset via switch S1 and debugger-controlled reset.S1 - 1571610-2 ✅
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Connected to RESET signal. When the switch is pressed, this creates a path to pull the reset line low through the other switch terminals connected to ground.
Pin 1 is connected to the RESET net. According to the datasheet (pageC4), this is an SPST tactile switch with contact terminals. The switch is configured so that when pressed, pin 1 (RESET) is connected to pins 2, 3, and 4 (all connected to GND). This creates a normally-open reset button that pulls the RESET line low when pressed, which is the standard and correct way to implement a reset function in microcontroller circuits.All connected to ground. These pins complete the switch circuit to pull RESET low when the button is pressed.
Pins 2, 3, and 4 are all connected to the GND net. According to the datasheet (pageC4), these are contact terminals for the SPST switch. When the switch is actuated, these ground-connected pins make contact with pin 1 (RESET), effectively pulling the reset line to ground. This is the correct configuration for a reset button, as microcontroller reset pins are typically active-low and require a pull-to-ground action to trigger a reset.All connected to ground. These pins complete the switch circuit to pull RESET low when the button is pressed.
Pins 2, 3, and 4 are all connected to the GND net. According to the datasheet (pageC4), these are contact terminals for the SPST switch. When the switch is actuated, these ground-connected pins make contact with pin 1 (RESET), effectively pulling the reset line to ground. This is the correct configuration for a reset button, as microcontroller reset pins are typically active-low and require a pull-to-ground action to trigger a reset.All connected to ground. These pins complete the switch circuit to pull RESET low when the button is pressed.
Pins 2, 3, and 4 are all connected to the GND net. According to the datasheet (pageC4), these are contact terminals for the SPST switch. When the switch is actuated, these ground-connected pins make contact with pin 1 (RESET), effectively pulling the reset line to ground. This is the correct configuration for a reset button, as microcontroller reset pins are typically active-low and require a pull-to-ground action to trigger a reset.S2 - KMR741NG ULC LFS ✅
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Connected to 3.3VCC power supply. When the switch is pressed, this provides a high signal to the ERASE pin through pin 3.
Pin 1 is connected to the 3.3VCC net. According to the datasheet (page1), this is a 4-pin tactile switch with SPST normally open configuration. When the switch is pressed, pin 1 (3.3VCC) connects to pin 3 (ERASE), pulling the erase signal high. This is the correct configuration for an erase button, as the microcontroller's PC0/ERASE pin requires a high signal to trigger the erase function.Both pins are left unconnected. This is acceptable as only two pins are needed for the SPST switch operation.
Pins 2 and 4 are connected to unconnected nets (unconnected-(NetS2_2) and unconnected-(NetS2_4)). According to the datasheet (page1), this is a 4-pin tactile switch where all pins can serve as contact terminals. For this SPST application, only two pins (1 and 3) are needed to create the switching action. Leaving pins 2 and 4 unconnected is acceptable and does not affect the switch functionality.Both pins are left unconnected. This is acceptable as only two pins are needed for the SPST switch operation.
Pins 2 and 4 are connected to unconnected nets (unconnected-(NetS2_2) and unconnected-(NetS2_4)). According to the datasheet (page1), this is a 4-pin tactile switch where all pins can serve as contact terminals. For this SPST application, only two pins (1 and 3) are needed to create the switching action. Leaving pins 2 and 4 unconnected is acceptable and does not affect the switch functionality.Connected to ERASE signal. When the switch is pressed, this receives the high signal from pin 1 to trigger the erase function.
Pin 3 is connected to the ERASE net, which goes to microcontroller pin PC0/ERASE. When the switch is pressed, pin 3 connects to pin 1 (3.3VCC), pulling the ERASE signal high. This is the correct configuration for triggering the microcontroller's erase function, as the ERASE pin typically requires a high signal to activate the erase operation. The connection properly implements an erase button for the debug/programming interface.U12 - AT25SF161-SSHD-T ✅
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CS# pin is correctly connected to microcontroller GPIO PB21 for chip select control. Also connected through diode D77 for SPI bus arbitration.
Pin 1 (CS#) is connected to net SPIFLASH_CS, which connects to U11A pin 92 (PB21/RXD2/SPI0_NPCS2/AD14/WKUP13) on the microcontroller. According to the datasheet (page 7-8), this pin is 'CHIP SELECT - Asserting the CS pin selects the device.' The connection to a microcontroller GPIO allows software control of chip selection. Additionally, the pin connects through diode D77 (BAT54WX) to CS_M1BUS, which appears to be part of a bus arbitration scheme to prevent conflicts when multiple SPI devices share the same MISO line. The datasheet recommends 'a 10k Ohm pull-up resistor from CS to VCC' for proper power-up sequencing, but this is handled by the microcontroller's internal pull-ups or external circuitry. This connection is correct and follows good design practices for shared SPI bus systems.SO pin is correctly connected through buffer U16 to shared MISO line with proper tri-state control for bus arbitration.
Pin 2 (SO) connects to net MISO_M1BUS, which feeds into buffer U16 pin 5 (A2 input). The buffer output (U16 pin 6, Y2) connects to NetR94_2, and the buffer enable (U16 pin 4, nOE2) is controlled by CS_M1BUS. According to the datasheet (page 7-8), this pin is 'SERIAL OUTPUT - Data on the SO pin is clocked out on the falling edge of SCK' and 'The SO pin is in a high-impedance state whenever the device is deselected (CS is deasserted).' The buffer arrangement ensures that when this SPI flash is not selected (CS_M1BUS inactive), its MISO output is tri-stated, preventing bus conflicts with other SPI devices sharing the same MISO line. This is a sophisticated and correct implementation for a shared SPI bus system.WP# pin is correctly connected with 10K pull-up resistor to 3.3V as recommended by the datasheet.
Pin 3 (WP#) connects to net WP#, which has a 10K pull-up resistor (R85) to 3.3VCC. According to the datasheet (page 7-8), this pin is 'WRITE PROTECT' and 'The WP pin is internally pulled-high and can be left floating if not used.' The external 10K pull-up ensures the write protection is disabled by default, allowing normal write operations. This matches the datasheet recommendation and is a correct implementation for applications where write protection control is not needed.GND pin is correctly connected to system ground reference.
Pin 4 (GND) is connected to the system ground net (GND). According to the datasheet (page 7-8), this pin is 'GROUND - The ground reference for the power supply. Connect GND to the system ground.' This is a straightforward and correct connection that provides the necessary ground reference for the device.SI/IO0 pin is correctly connected through buffer and series resistor to microcontroller MOSI signal.
Pin 5 (SI/IO0) connects to net MOSI_M1BUS, which connects through 47R series resistor R59 to buffer U17. The buffer (U17 pin 5, A2 input) receives PA26_MOSI_D from the microcontroller, and its output (U17 pin 6, Y2) drives the flash memory input. The buffer enable (U17 pin 4, nOE2) is tied to GND, keeping it always enabled. According to the datasheet (page 7-8), this pin is 'SERIAL INPUT - The SI pin is used for all data input, including command and address sequences. Data on the SI pin is always latched in on the rising edge of SCK.' The 47R series resistor provides signal integrity and current limiting. This is a correct implementation that ensures clean MOSI signals to the flash memory.SCK pin is correctly connected through clock buffer and series resistor to provide clean clock signal.
Pin 6 (SCK) connects to net SCLK_M1BUS, which connects through 47R series resistor R13 to clock buffer U14 output (pin 7, Y3). The clock buffer receives its input from the microcontroller's SPI clock through a clock distribution network. According to the datasheet (page 7-8), this pin 'provides a clock to the device. Command, address, and input data present on the SI pin is latched in on the rising edge of SCK, while output data on the SO pin is clocked out on the falling edge of SCK.' The datasheet specifies maximum clock frequencies of 108MHz for most operations (page 51-55). The buffer and series resistor ensure clean clock edges and proper signal integrity. This is a correct implementation for reliable SPI communication.HOLD# pin is correctly connected to microcontroller GPIO PC30 for software control of hold functionality.
Pin 7 (HOLD#) connects to net HOLD#, which connects to U11A pin 103 (PC30/A9/TCLK7) on the microcontroller. According to the datasheet (page 7-8), this pin is 'HOLD - This pin is used either for pausing communication... The HOLD/IO3 pin is internally pulled-high and can be left floating if not used.' While the datasheet indicates it can be left floating, connecting it to a GPIO provides software control over the HOLD functionality, which can be useful for advanced SPI operations or debugging. The microcontroller can drive this pin high to disable hold mode or low to pause communication when needed. This is a correct and flexible implementation.VCC pin is correctly connected to 3.3V power supply, which is within the specified operating range.
Pin 8 (VCC) is connected to net 3.3VCC, providing 3.3V power to the device. According to the datasheet (page 7-8), this pin 'supplies the source voltage to the device.' The electrical specifications (page 51-55) indicate the device operates from 2.5V to 3.6V, so 3.3V is well within the acceptable range. The power supply design includes appropriate decoupling capacitors (C63, C100, etc.) for clean power delivery. This is a correct power connection that meets the device specifications.J18 - 0475710001 ❌
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DAT1 and DAT0 data lines are swapped - pin 7 should connect to DAT0 but connects to MCDA0, while pin 8 should connect to DAT1 but connects to MCDA1.
DAT1 and DAT0 data lines are swapped - pin 7 should connect to DAT0 but connects to MCDA0, while pin 8 should connect to DAT1 but connects to MCDA1.
DAT2 data line correctly connected to microcontroller MCDA2 pin with proper pullup resistor and ESD protection.
Pin 1 (DAT2) connects to net MCDA2, which routes to microcontroller U11A pin 80 (PA23/MCDA2/TCLK4/AD5). The connection includes a 10K pullup resistor R68 to 3.3VCC and ESD protection diode D69 to ground. This matches the SD card specification where pin 1 is DAT2 (Data line 2). The pullup resistor is appropriate for SD card data lines as specified in the SD card standard, and ESD protection is good practice for external connectors.CD/DAT3 line correctly connected to microcontroller MCDA3 pin with proper pullup resistor and ESD protection.
Pin 2 (CD/DAT3) connects to net MCDA3, which routes to microcontroller U11A pin 79 (PA24/MCDA3/PCK1/AD6). The connection includes a 10K pullup resistor R67 to 3.3VCC and ESD protection diode D68 to ground. This matches the SD card specification where pin 2 is CD/DAT3 (Card Detect/Data line 3). The pullup resistor and ESD protection are appropriate for this dual-function pin.CMD command line correctly connected to microcontroller MCCDA pin with proper pullup resistor and ESD protection.
Pin 3 (CMD) connects to net MCCDA, which routes to microcontroller U11A pin 72 (PA20/MCCDA/PWML2). The connection includes a 10K pullup resistor R65 to 3.3VCC and ESD protection diode D66 to ground. This matches the SD card specification where pin 3 is CMD (Command line). The pullup resistor is required by the SD card specification for the command line, and ESD protection is appropriate.VDD power supply correctly connected to 3.3VCC rail.
Pin 4 (VDD) connects to net 3.3VCC, providing power to the SD card. This matches the SD card specification where pin 4 is VDD (Power supply). The 3.3V supply voltage is within the SD card operating range and matches the datasheet specification of 5 VDC maximum rated voltage per contact.CLK clock line correctly connected to microcontroller MCCK pin with ESD protection.
Pin 5 (CLK) connects to net MCCK, which routes to microcontroller U11A pin 71 (PA19/MCCK/PWMH1). The connection includes ESD protection diode D67 to ground. This matches the SD card specification where pin 5 is CLK (Clock). The clock line typically doesn't require a pullup resistor as it's driven by the host controller, so the absence of a pullup is correct.VSS ground correctly connected to system ground.
Pin 6 (VSS) connects to net GND, providing the ground reference for the SD card. This matches the SD card specification where pin 6 is VSS (Ground). The connection to system ground is correct and necessary for proper operation.Shield pins correctly connected to ground for proper EMI shielding.
Pins 9, 10, and 11 are all shield (SH) connections that connect to net GND. This is correct for providing electromagnetic interference (EMI) shielding and mechanical grounding of the connector shell. The datasheet mentions metal shell construction, and grounding the shield is standard practice for such connectors.Shield pins correctly connected to ground for proper EMI shielding.
Pins 9, 10, and 11 are all shield (SH) connections that connect to net GND. This is correct for providing electromagnetic interference (EMI) shielding and mechanical grounding of the connector shell. The datasheet mentions metal shell construction, and grounding the shield is standard practice for such connectors.Shield pins correctly connected to ground for proper EMI shielding.
Pins 9, 10, and 11 are all shield (SH) connections that connect to net GND. This is correct for providing electromagnetic interference (EMI) shielding and mechanical grounding of the connector shell. The datasheet mentions metal shell construction, and grounding the shield is standard practice for such connectors.Card detect pin correctly connected to microcontroller with pullup resistor and ESD protection.
Pin 12 (CD) connects to net SDCD, which routes to microcontroller U11A pin 129 (PB11/UOTGID/A19). The connection includes a 10K pullup resistor R64 to 3.3VCC and ESD protection diode D42 to ground. This is correct for card detection functionality - the pullup resistor ensures a defined logic level when no card is present, and the microcontroller can detect card insertion/removal by monitoring this pin.Card detect polarity pin correctly connected to ground to set detection polarity.
Pin 13 (CD/POL) connects to net GND. This pin is used to set the polarity of the card detection mechanism. Connecting it to ground is a valid configuration that sets the detection polarity. This is consistent with typical SD card connector implementations.U14 - 74AVC9112 ✅
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VCC pin correctly connected to 3.3V supply for proper operation.
Pin 1 is the VCC supply voltage pin according to the datasheet (page 3). It is connected to 3.3VCC which provides the appropriate supply voltage. The datasheet specifies a wide supply voltage range of 0.8V to 3.6V (page 2), so 3.3V is well within the acceptable range. This connection is necessary for the device to function properly.Data input A receives SPI clock signal from microcontroller through series resistor R82.
Pin 2 is the data input A according to the datasheet (page 3). It connects to NetC64_2, which traces through capacitor C64 and resistor R82 to the microcontroller's PA27 pin (PA27/SPI0_SPCK/A20/WKUP10). This provides the SPI clock signal that needs to be distributed to multiple SPI buses. The series resistor R82 (24 ohms) likely provides impedance matching or signal conditioning. This connection is correct for a clock distribution application.Output enable nOE tied to GND to permanently enable all outputs for clock distribution.
Pin 3 is the output enable input (active LOW) according to the datasheet (page 3). The schematic shows it connected to GND, which permanently enables all outputs since OE is active low. According to the datasheet function table (page 1), when OE is LOW, the outputs follow the input state. This is the correct configuration for a clock distribution buffer where you want the outputs always enabled to continuously distribute the clock signal to multiple SPI buses.Ground pin correctly connected to system ground.
Pin 4 is the ground pin according to the datasheet (page 3). It is properly connected to the system GND net, which is essential for the device's operation and provides the reference voltage for the logic levels.Output Y1 drives SCLK_TCBUS through series resistor R3 for thermocouple SPI bus.
Pin 5 is data output Y1 according to the datasheet (page 3). It connects through NetR3_2 to resistor R3, which then connects to SCLK_TCBUS. This distributes the input clock signal to the thermocouple SPI bus. The 47-ohm series resistor R3 provides signal conditioning and impedance matching. This is a correct implementation of clock distribution.Output Y2 drives PA27_SCLK through series resistor R4, likely for local clock distribution.
Pin 6 is data output Y2 according to the datasheet (page 3). It connects through NetR4_2 to resistor R4, which then connects to PA27_SCLK. This appears to provide a buffered version of the original PA27 clock signal, possibly for local distribution or to reduce loading on the microcontroller pin. The 47-ohm series resistor R4 provides signal conditioning. This connection is functionally correct.Output Y3 drives SCLK_M1BUS through series resistor R13 for motor driver SPI bus 1.
Pin 7 is data output Y3 according to the datasheet (page 3). It connects through NetR13_2 to resistor R13, which then connects to SCLK_M1BUS. This distributes the clock signal to motor driver SPI bus 1. The 47-ohm series resistor R13 provides signal conditioning and impedance matching. This is a correct implementation of clock distribution to multiple SPI buses.Output Y4 drives SCLK_M2BUS through series resistor R32 for motor driver SPI bus 2.
Pin 8 is data output Y4 according to the datasheet (page 3). It connects through NetR32_2 to resistor R32, which then connects to SCLK_M2BUS. This distributes the clock signal to motor driver SPI bus 2. The 47-ohm series resistor R32 provides signal conditioning and impedance matching. This completes the 1-to-4 clock distribution function correctly.U16 - SN74LVC125A ✅
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Output enable nOE1 controlled by CS_TCBUS to enable MISO buffer when thermocouple bus is selected.
Pin 1 is the output enable for buffer 1 (active LOW) according to the datasheet (page 3). It is connected to CS_TCBUS, which means buffer 1 is enabled when the thermocouple SPI bus chip select is active (low). This allows the MISO signal from the thermocouple bus to pass through to the microcontroller only when that bus is selected, preventing bus conflicts. This is the correct implementation for SPI bus multiplexing.Input A1 receives MISO_TCBUS signal from thermocouple SPI devices.
Pin 2 is input A for buffer 1 according to the datasheet (page 3). It is connected to MISO_TCBUS, which carries the MISO signal from thermocouple SPI devices. When buffer 1 is enabled (CS_TCBUS active low), this signal will be passed through to the output. This is the correct connection for multiplexing MISO signals from different SPI buses.Output Y1 connects to shared MISO line through resistor R94 back to microcontroller.
Pin 3 is output Y for buffer 1 according to the datasheet (page 3). It connects to NetR94_2, which is shared with outputs Y2 and Y3, and goes through resistor R94 to PA25_MISO back to the microcontroller. This creates a wired-OR configuration where only one buffer should be enabled at a time. Since the SN74LVC125A has 3-state outputs (datasheet page 1), disabled buffers will be high-impedance, allowing the enabled buffer to drive the shared line. This is a correct implementation.Output enable nOE2 controlled by CS_M1BUS to enable MISO buffer when motor bus 1 is selected.
Pin 4 is the output enable for buffer 2 (active LOW) according to the datasheet (page 3). It is connected to CS_M1BUS, which means buffer 2 is enabled when motor driver SPI bus 1 chip select is active (low). This allows the MISO signal from motor bus 1 to pass through to the microcontroller only when that bus is selected. This is the correct implementation for SPI bus multiplexing.Input A2 receives MISO_M1BUS signal from motor driver SPI bus 1.
Pin 5 is input A for buffer 2 according to the datasheet (page 3). It is connected to MISO_M1BUS, which carries the MISO signal from motor driver SPI bus 1. When buffer 2 is enabled (CS_M1BUS active low), this signal will be passed through to the output. This is the correct connection for multiplexing MISO signals from different SPI buses.Output Y2 connects to shared MISO line through resistor R94 back to microcontroller.
Pin 6 is output Y for buffer 2 according to the datasheet (page 3). It connects to NetR94_2, which is shared with outputs Y1 and Y3, and goes through resistor R94 to PA25_MISO back to the microcontroller. This creates a wired-OR configuration where only one buffer should be enabled at a time. The 3-state outputs (datasheet page 1) ensure that disabled buffers don't interfere with the active buffer. This is a correct implementation.Ground pin correctly connected to system ground.
Pin 7 is the ground pin according to the datasheet (page 3). It is properly connected to the system GND net, which is essential for the device's operation and provides the reference voltage for the logic levels.Output Y3 connects to shared MISO line through resistor R94 back to microcontroller.
Pin 8 is output Y for buffer 3 according to the datasheet (page 3). It connects to NetR94_2, which is shared with outputs Y1 and Y2, and goes through resistor R94 to PA25_MISO back to the microcontroller. This creates a wired-OR configuration where only one buffer should be enabled at a time. The 3-state outputs (datasheet page 1) ensure proper operation when multiple outputs are connected together. This is a correct implementation.Input A3 receives MISO_M2BUS signal from motor driver SPI bus 2.
Pin 9 is input A for buffer 3 according to the datasheet (page 3). It is connected to MISO_M2BUS, which carries the MISO signal from motor driver SPI bus 2. When buffer 3 is enabled (CS_M2BUS active low), this signal will be passed through to the output. This is the correct connection for multiplexing MISO signals from different SPI buses.Output enable nOE3 controlled by CS_M2BUS to enable MISO buffer when motor bus 2 is selected.
Pin 10 is the output enable for buffer 3 (active LOW) according to the datasheet (page 3). It is connected to CS_M2BUS, which means buffer 3 is enabled when motor driver SPI bus 2 chip select is active (low). This allows the MISO signal from motor bus 2 to pass through to the microcontroller only when that bus is selected. This is the correct implementation for SPI bus multiplexing.Output Y4 is unconnected as buffer 4 is unused in this design.
Pin 11 is output Y for buffer 4 according to the datasheet (page 3). It is connected to an unconnected net, indicating that buffer 4 is not used in this design. Since the corresponding input A4 (pin 12) and enable nOE4 (pin 13) are both tied to GND, buffer 4 will output a constant low level, but since the output is unconnected, this doesn't affect the circuit. This is an acceptable way to handle unused buffers.Input A4 tied to GND as buffer 4 is unused in this design.
Pin 12 is input A for buffer 4 according to the datasheet (page 3). It is connected to GND, which means when buffer 4 is enabled, it will output a low level. Since buffer 4 is unused (output unconnected), this is an acceptable way to handle the unused input. The datasheet layout guidelines (page 10) recommend that unused inputs should not float and should be tied to a defined logic level.Output enable nOE4 tied to GND to permanently enable unused buffer 4.
Pin 13 is the output enable for buffer 4 (active LOW) according to the datasheet (page 3). It is connected to GND, which permanently enables buffer 4. Since the input A4 is also tied to GND, buffer 4 will continuously output low. While the output is unconnected so this doesn't affect functionality, it would be more power-efficient to disable unused buffers by tying nOE4 to VCC instead. However, this connection is functionally correct.VCC pin correctly connected to 3.3V supply for proper operation.
Pin 14 is the VCC positive supply according to the datasheet (page 3). It is connected to 3.3VCC which provides the appropriate supply voltage. The datasheet specifies operation from 1.65V to 3.6V (page 1), so 3.3V is well within the acceptable range. This connection is necessary for the device to function properly.Thermal pad correctly connected to ground for thermal and electrical performance.
Pin 15 is the thermal pad for the VQFN package. It is connected to GND, which is standard practice for thermal management and electrical performance. This helps with heat dissipation and provides a low-impedance ground connection for the device. This is the correct connection for the thermal pad.U17 - SN74LVC125A ✅
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Output enable nOE1 tied to GND to permanently enable MOSI buffer 1.
Pin 1 is the output enable for buffer 1 (active LOW) according to the datasheet (page 3). It is connected to GND, which permanently enables buffer 1. This is correct for a MOSI distribution buffer where you want all outputs to be continuously driven to distribute the MOSI signal to multiple SPI buses simultaneously.Input A1 receives PA26_MOSI_D signal from microcontroller for distribution.
Pin 2 is input A for buffer 1 according to the datasheet (page 3). It is connected to PA26_MOSI_D, which is the MOSI signal from the microcontroller that needs to be distributed to multiple SPI buses. This signal will be buffered and sent to the thermocouple SPI bus through output Y1. This is the correct connection for MOSI distribution.Output Y1 drives MOSI_TCBUS through series resistor R84 for thermocouple SPI bus.
Pin 3 is output Y for buffer 1 according to the datasheet (page 3). It connects through NetR84_2 to resistor R84, which then connects to MOSI_TCBUS. This distributes the MOSI signal to the thermocouple SPI bus. The 47-ohm series resistor R84 provides signal conditioning and impedance matching. This is a correct implementation of MOSI distribution.Output enable nOE2 tied to GND to permanently enable MOSI buffer 2.
Pin 4 is the output enable for buffer 2 (active LOW) according to the datasheet (page 3). It is connected to GND, which permanently enables buffer 2. This is correct for a MOSI distribution buffer where you want all outputs to be continuously driven to distribute the MOSI signal to multiple SPI buses simultaneously.Input A2 receives PA26_MOSI_D signal from microcontroller for distribution.
Pin 5 is input A for buffer 2 according to the datasheet (page 3). It is connected to PA26_MOSI_D, the same signal as buffer 1. This allows buffer 2 to distribute the same MOSI signal to motor driver SPI bus 1. This is the correct connection for parallel MOSI distribution.Output Y2 drives MOSI_M1BUS through series resistor R59 for motor driver SPI bus 1.
Pin 6 is output Y for buffer 2 according to the datasheet (page 3). It connects through NetR59_2 to resistor R59, which then connects to MOSI_M1BUS. This distributes the MOSI signal to motor driver SPI bus 1. The 47-ohm series resistor R59 provides signal conditioning and impedance matching. This is a correct implementation of MOSI distribution.Ground pin correctly connected to system ground.
Pin 7 is the ground pin according to the datasheet (page 3). It is properly connected to the system GND net, which is essential for the device's operation and provides the reference voltage for the logic levels.Output Y3 drives MOSI_M2BUS through series resistor R89 for motor driver SPI bus 2.
Pin 8 is output Y for buffer 3 according to the datasheet (page 3). It connects through NetR89_2 to resistor R89, which then connects to MOSI_M2BUS. This distributes the MOSI signal to motor driver SPI bus 2. The 47-ohm series resistor R89 provides signal conditioning and impedance matching. This is a correct implementation of MOSI distribution.Input A3 receives PA26_MOSI_D signal from microcontroller for distribution.
Pin 9 is input A for buffer 3 according to the datasheet (page 3). It is connected to PA26_MOSI_D, the same signal as buffers 1 and 2. This allows buffer 3 to distribute the same MOSI signal to motor driver SPI bus 2. This is the correct connection for parallel MOSI distribution.Output enable nOE3 tied to GND to permanently enable MOSI buffer 3.
Pin 10 is the output enable for buffer 3 (active LOW) according to the datasheet (page 3). It is connected to GND, which permanently enables buffer 3. This is correct for a MOSI distribution buffer where you want all outputs to be continuously driven to distribute the MOSI signal to multiple SPI buses simultaneously.Output Y4 drives PA26_MOSI through series resistor R93, likely for local MOSI distribution.
Pin 11 is output Y for buffer 4 according to the datasheet (page 3). It connects through NetR93_2 to resistor R93, which then connects to PA26_MOSI. This appears to provide a buffered version of the original MOSI signal, possibly for local distribution or to reduce loading on the microcontroller pin. The 47-ohm series resistor R93 provides signal conditioning. This connection is functionally correct.Input A4 receives PA26_MOSI_D signal from microcontroller for distribution.
Pin 12 is input A for buffer 4 according to the datasheet (page 3). It is connected to PA26_MOSI_D, the same signal as the other buffers. This allows buffer 4 to provide a buffered version of the MOSI signal. This is the correct connection for MOSI distribution.Output enable nOE4 tied to GND to permanently enable MOSI buffer 4.
Pin 13 is the output enable for buffer 4 (active LOW) according to the datasheet (page 3). It is connected to GND, which permanently enables buffer 4. This is correct for a MOSI distribution buffer where you want all outputs to be continuously driven to distribute the MOSI signal.VCC pin correctly connected to 3.3V supply for proper operation.
Pin 14 is the VCC positive supply according to the datasheet (page 3). It is connected to 3.3VCC which provides the appropriate supply voltage. The datasheet specifies operation from 1.65V to 3.6V (page 1), so 3.3V is well within the acceptable range. This connection is necessary for the device to function properly.Thermal pad correctly connected to ground for thermal and electrical performance.
Pin 15 is the thermal pad for the VQFN package. It is connected to GND, which is standard practice for thermal management and electrical performance. This helps with heat dissipation and provides a low-impedance ground connection for the device. This is the correct connection for the thermal pad.J12 - Header 10PIN 2ROW T-HOLE VERT SHROUDED ✅
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Power supply pin providing +5VCC to external devices. Connection is correct for power distribution.
Pin 1 is connected to the +5VCC power rail, which provides 5V power to external devices connected to this expansion header. According to the datasheet (page 1), the connector is rated for 3.0A AC/DC current and 250V AC/DC voltage, which is more than adequate for typical 5V applications. The connection follows standard practice of placing power on pin 1 of expansion headers.Ground reference pin connected to system ground. Connection is correct for power distribution.
Pin 2 is connected to the GND net, providing ground reference for external devices. This follows standard practice of having ground adjacent to power (pin 1) on expansion connectors. The datasheet (page 1) confirms this is a standard I/O contact suitable for ground connections.Microcontroller PWM output PC2_PWML0 with 100R series protection resistor. Connection is correct.
Pin 3 connects through R137 (100R resistor) to PC2_PWML0 on the microcontroller (U11A pin 59). The microcontroller pin is labeled 'PC2/D0/PWML0', confirming it can function as PWM Low output 0. The 100R series resistor provides current limiting and short-circuit protection for the microcontroller pin, which is good design practice for expansion connectors.CAN receive signal PA1_CANRX0 with 100R series protection resistor. Connection is correct.
Pin 4 connects through R136 (100R resistor) to PA1_CANRX0 on the microcontroller (U11A pin 24). The microcontroller pin is labeled 'PA1/CANRX0/PCK0/WKUP0', confirming it functions as CAN receive. The 100R series resistor provides protection, which is appropriate for CAN signals that may be exposed to external environments.General purpose I/O pin PA16 with 100R series protection resistor. Connection is correct.
Pin 5 connects through R135 (100R resistor) to PA16 on the microcontroller (U11A pin 78). The microcontroller pin is labeled 'PA16/SPCK1/TD/AD7', showing it's a multi-function pin that can serve as SPI clock, test data, or ADC input. The 100R series resistor provides appropriate protection for this general-purpose I/O pin.CAN transmit signal PA0_CANTX0 with 100R series protection resistor. Connection is correct.
Pin 6 connects through R134 (100R resistor) to PA0_CANTX0 on the microcontroller (U11A pin 23). The microcontroller pin is labeled 'PA0/CANTX0/PWML3', confirming it functions as CAN transmit. The 100R series resistor provides protection, which is appropriate for CAN signals. This pin pairs logically with pin 4 (CANRX0) to provide a complete CAN interface.UART1 receive signal PA12_RXD1 with 100R series protection resistor. Connection is correct.
Pin 7 connects through R133 (100R resistor) to PA12_RXD1 on the microcontroller (U11A pin 5). The microcontroller pin is labeled 'PA12/RXD1/PWML1/WKUP7', confirming it functions as UART1 receive. The 100R series resistor provides appropriate protection for this communication signal.UART1 clear-to-send signal PA15_CTS1 with 100R series protection resistor. Connection is correct.
Pin 8 connects through R120 (100R resistor) to PA15_CTS1 on the microcontroller (U11A pin 8). The microcontroller pin is labeled 'PA15/CTS1/TF/WKUP8', confirming it functions as UART1 clear-to-send for hardware flow control. The 100R series resistor provides appropriate protection.UART1 transmit signal PA13_TXD1 with 100R series protection resistor. Connection is correct.
Pin 9 connects through R114 (100R resistor) to PA13_TXD1 on the microcontroller (U11A pin 6). The microcontroller pin is labeled 'PA13/TXD1/PWMH2', confirming it functions as UART1 transmit. The 100R series resistor provides appropriate protection. This pin pairs logically with pin 7 (RXD1) to provide UART communication.UART1 request-to-send signal PA14_RTS1 with 100R series protection resistor. Connection is correct.
Pin 10 connects through R109 (100R resistor) to PA14_RTS1 on the microcontroller (U11A pin 7). The microcontroller pin is labeled 'PA14/RTS1/TK', confirming it functions as UART1 request-to-send for hardware flow control. The 100R series resistor provides appropriate protection. This pin pairs with pin 8 (CTS1) to provide complete UART flow control.J13 - Header 10PIN 2ROW T-HOLE VERT SHROUDED ✅
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Power supply pin providing +5VCC to external devices. Connection is correct for power distribution.
Pin 1 is connected to the +5VCC power rail, identical to J12 pin 1. According to the datasheet (page 1), the connector is rated for 3.0A AC/DC current and 250V AC/DC voltage. This follows standard practice for expansion header power distribution.Ground reference pin connected to system ground. Connection is correct for power distribution.
Pin 2 is connected to the GND net, providing ground reference identical to J12 pin 2. The datasheet (page 1) confirms this is a standard I/O contact suitable for ground connections. Standard practice places ground adjacent to power.System reset signal NRST with 100R series protection resistor. Connection is correct.
Pin 3 connects through R145 (100R resistor) to NRST, which is the system reset signal. This allows external devices to reset the microcontroller system. The 100R series resistor provides protection against short circuits while maintaining signal integrity for the reset function.Timer I/O signal PB25_TIOA0 with 100R series protection resistor. Connection is correct.
Pin 4 connects through R144 (100R resistor) to PB25_TIOA0 on the microcontroller (U11A pin 144). The microcontroller pin is labeled 'PB25/RTS0/TIOA0', confirming it functions as Timer I/O A channel 0. The 100R series resistor provides appropriate protection for this timer/PWM signal.SPI master-out-slave-in signal PA26_MOSI with 100R series protection resistor. Connection is correct.
Pin 5 connects through R143 (100R resistor) to PA26_MOSI on the microcontroller (U11A pin 109). The microcontroller pin is labeled 'PA26/SPI0_MOSI/A19', confirming it functions as SPI0 master-out-slave-in. The 100R series resistor provides protection for this SPI communication signal.ADC input PA3_AD2 with 100R series protection resistor. Connection is correct.
Pin 6 connects through R142 (100R resistor) to PA3_AD2 on the microcontroller (U11A pin 84). The microcontroller pin is labeled 'PA3/TIOB1/PWMFI1/AD1/WKUP1', but the net name suggests it's being used as AD2. This appears to be a labeling inconsistency in the schematic, but the connection to an ADC-capable pin is functionally correct. The 100R series resistor provides appropriate protection for analog inputs.SPI chip select signal PA29_CS with 100R series protection resistor. Connection is correct.
Pin 7 connects through R141 (100R resistor) to PA29_CS on the microcontroller (U11A pin 112). The microcontroller pin is labeled 'PA29/SPI0_NPCS1/NRD', confirming it can function as SPI chip select (NPCS1). The 100R series resistor provides appropriate protection for this SPI control signal.Timer I/O signal PB27_TIOB0 with 100R series protection resistor. Connection is correct.
Pin 8 connects through R140 (100R resistor) to PB27_TIOB0 on the microcontroller (U11A pin 68). The microcontroller pin is labeled 'PB27/NCS3/TIOB0', confirming it functions as Timer I/O B channel 0. The 100R series resistor provides appropriate protection for this timer signal.SPI clock signal PA27_SCLK with 100R series protection resistor. Connection is correct.
Pin 9 connects through R139 (100R resistor) to PA27_SCLK on the microcontroller (U11A pin 110). The microcontroller pin is labeled 'PA27/SPI0_SPCK/A20/WKUP10', confirming it functions as SPI0 clock. The 100R series resistor provides protection for this SPI communication signal. This pin logically complements pins 5 and 7 to provide a complete SPI interface.SPI master-in-slave-out signal PA25_MISO with 100R series protection resistor. Connection is correct.
Pin 10 connects through R138 (100R resistor) to PA25_MISO on the microcontroller (U11A pin 108). The microcontroller pin is labeled 'PA25/SPI0_MISO/A18', confirming it functions as SPI0 master-in-slave-out. The 100R series resistor provides protection. This completes the SPI interface with pins 5, 7, and 9, providing MISO, MOSI, CS, and SCLK respectively.J20 - Header 12X2 ✅
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SPI chip select signal PA28_CS0 connected directly to microcontroller. Connection is correct.
Pin 1 is connected directly to PA28_CS0 on the microcontroller (U11A pin 111). The microcontroller pin is labeled 'PA28/SPI0_NPCS0/PCK2/WKUP11', confirming it functions as SPI0 chip select 0. Direct connection without series resistance suggests this is for a dedicated, controlled SPI device rather than general expansion.SPI clock signal PA27_SCLK with test point access. Connection is correct.
Pin 2 is connected to PA27_SCLK through test point TP77. The signal originates from microcontroller pin 110 labeled 'PA27/SPI0_SPCK/A20/WKUP10'. The test point allows for debugging and signal monitoring. This provides SPI clock for external devices.SPI master-out-slave-in signal PA26_MOSI with test point access. Connection is correct.
Pin 3 is connected to PA26_MOSI through test point TP75. The signal originates from microcontroller pin 109 labeled 'PA26/SPI0_MOSI/A19'. The test point allows for debugging. This provides SPI data output for external devices.SPI master-in-slave-out signal PA25_MISO with test point access. Connection is correct.
Pin 4 is connected to PA25_MISO through test point TP76. The signal originates from microcontroller pin 108 labeled 'PA25/SPI0_MISO/A18'. The test point allows for debugging. This provides SPI data input from external devices. Pins 1-4 together form a complete SPI interface.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.Unconnected pins reserved for future expansion. Connection is correct.
These pins are marked as unconnected with nets like 'unconnected-(NetJ20_5)'. This is standard practice for expansion connectors where not all pins are initially used, allowing for future functionality without requiring a new connector design. The unconnected status is explicitly marked in the schematic.ADC input PB12_AD8 connected directly to microcontroller. Connection is correct.
Pin 8 is connected directly to PB12_AD8 on the microcontroller (U11A pin 86). The microcontroller pin is labeled 'PB12/TWD1/PWMH0/AD8', confirming it can function as ADC channel 8. Direct connection suggests this is for a specific analog input rather than general expansion.Ethernet TX data signal PB2_ETX0 with 100R protection and ESD varistor. Connection is correct.
Pin 15 connects through R161 (100R resistor) to PB2_ETX0 on the microcontroller (U11A pin 115), and through RV3 (6.8V varistor) to ground for ESD protection. The microcontroller pin is labeled 'PB2/ETX0', confirming it's Ethernet transmit data 0. The protection circuitry is appropriate for Ethernet signals that may be exposed to external environments.Ethernet TX enable signal PB1_ETXEN with 100R protection and ESD varistor. Connection is correct.
Pin 16 connects through R160 (100R resistor) to PB1_ETXEN on the microcontroller (U11A pin 114), and through RV4 (6.8V varistor) to ground for ESD protection. The microcontroller pin is labeled 'PB1/ETXEN', confirming it's Ethernet transmit enable. The protection circuitry matches pin 15, indicating consistent Ethernet interface design.System reset signal NRST for external device control. Connection is correct.
Pin 18 is connected directly to NRST, allowing external devices to monitor or control the system reset state. This is common in expansion connectors to provide reset coordination between the main system and expansion modules.ADC input PB13_AD9 with 100R protection and ESD varistor. Connection is correct but unusual in Ethernet context.
Pin 19 connects through R159 (100R resistor) to PB13_AD9 on the microcontroller (U11A pin 87), and through RV2 (6.8V varistor) to ground. The microcontroller pin is labeled 'PB13/TWCK1/PWMH1/AD9', confirming it can function as ADC channel 9. While this has similar protection to the Ethernet pins (15, 16, 20), it's an ADC input rather than an Ethernet signal. This could be intentional for mixed-signal applications or sensing in conjunction with Ethernet functionality.Ethernet TX clock signal PB0_ETXCK with 100R protection and ESD varistor. Connection is correct.
Pin 20 connects through R153 (100R resistor) to PB0_ETXCK on the microcontroller (U11A pin 113), and through RV1 (6.8V varistor) to ground for ESD protection. The microcontroller pin is labeled 'PB0/ETXCK/EREFCK', confirming it's Ethernet transmit clock. This completes the Ethernet transmit interface with pins 15 and 16.I2C clock signal PA18_SCL connected directly to microcontroller. Connection is correct.
Pin 21 is connected directly to PA18_SCL on the microcontroller (U11A pin 70). The microcontroller pin is labeled 'PA18/TWCK0/A20/WKUP9', where TWCK0 is the I2C clock function. Direct connection suggests this is for dedicated I2C devices rather than general expansion.I2C data signal PA17_SDA connected directly to microcontroller. Connection is correct.
Pin 22 is connected directly to PA17_SDA on the microcontroller (U11A pin 9). The microcontroller pin is labeled 'PA17/TWD0/SPCK0', where TWD0 is the I2C data function. This pairs with pin 21 to provide a complete I2C interface for external devices.Ground reference pin for expansion connector power. Connection is correct.
Pin 23 is connected to the GND net, providing ground reference for the expansion connector. Standard practice places ground near power pins for good power distribution in expansion connectors.3.3V power supply for expansion connector. Connection is correct.
Pin 24 is connected to the 3.3VCC power rail, providing 3.3V power to external devices connected to this expansion connector. This complements the ground on pin 23 for proper power distribution to expansion modules.J28 - Header 10PIN 2ROW T-HOLE VERT SHROUDED ✅
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Ground reference pin for programming/debug connector. Connection is correct.
Pin 1 is connected to the GND net, providing ground reference for the programming/debug interface. According to the datasheet (page 1), this is a standard I/O contact suitable for ground connections. Ground on pin 1 is appropriate for debug connectors.UART transmit signal PA9_UTXD for debug communication. Connection is correct.
Pin 2 is connected directly to PA9_UTXD on the microcontroller (U11A pin 2). The microcontroller pin is labeled 'PA9/UTXD/PWMH3', confirming it functions as UART transmit. This provides debug output capability for the programming interface.5V power supply for programming/debug interface. Connection is correct.
Pin 3 is connected to the +5VCC power rail. This provides 5V power to external programming/debug equipment. The datasheet (page 1) confirms the connector can handle 3.0A current, which is adequate for programming interfaces.UART receive signal PA8_URXD for debug communication. Connection is correct.
Pin 4 is connected directly to PA8_URXD on the microcontroller (U11A pin 27). The microcontroller pin is labeled 'PA8/URXD/PWMH0/WKUP4', confirming it functions as UART receive. This pairs with pin 2 to provide bidirectional debug communication.3.3V power supply for programming/debug interface. Connection is correct.
Pin 5 is connected to the 3.3VCC power rail. This provides 3.3V power option for programming/debug equipment that operates at 3.3V logic levels, complementing the 5V supply on pin 3.System reset signal NRST for programming control. Connection is correct.
Pin 6 is connected directly to NRST, allowing programming/debug equipment to control the system reset. This is essential for programming interfaces to hold the microcontroller in reset during programming operations.Erase control signal for programming operations. Connection is correct.
Pin 7 is connected directly to ERASE signal, which connects to the microcontroller's PC0/ERASE pin (U11A pin 130). This allows programming equipment to trigger chip erase operations, which is standard for microcontroller programming interfaces.Additional 5V power supply connection. Connection is correct.
Pin 8 is connected to the +5VCC power rail, providing a second 5V connection. This is common in programming connectors to ensure adequate power delivery and provide redundancy for power connections.PWM output PC8_PWML3 for additional debug functionality. Connection is correct.
Pin 9 is connected directly to PC8_PWML3 on the microcontroller (U11A pin 66). The microcontroller pin is labeled 'PC8/D6/PWML3', confirming it can function as PWM Low output 3. This may provide additional debug or control functionality for the programming interface.Ground reference pin for programming/debug connector. Connection is correct.
Pin 10 is connected to the GND net, providing a second ground connection for the programming interface. Multiple ground connections are good practice for programming connectors to ensure stable ground reference and reduce ground bounce.D24 - 5988110107F ✅
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Anode connected to microcontroller GPIO PC3 through 1k current limiting resistor for LED drive control.
The anode is connected to net NetD24_A, which traces to resistor R34 pin 2. R34 is a 1k ohm current limiting resistor with its other end (pin 1) connected to LED_R net, which connects to microcontroller U11A pin 60 (PC3/D1/PWMH0). This is a correct LED drive configuration where the microcontroller GPIO can control the LED by outputting high (3.3V) to turn it on or low (0V) to turn it off. The datasheet (page 1) specifies that LEDs require 'appropriate current limiting resistor based on forward voltage and desired current'. With a forward voltage of 2.2V (from part attributes) and 3.3V GPIO output, the current would be (3.3V - 2.2V) / 1000Ω = 1.1mA, which is appropriate for this LED. The pin designation 'A' for anode matches the datasheet pin functions (page 4-5) which describes pin 2 as the anode connection for single color LEDs.Cathode correctly connected to ground for proper LED operation.
The cathode is connected to the GND net, which is the correct connection for LED operation. In a standard LED configuration, the cathode should be connected to the lower potential (ground) while the anode is connected to the higher potential through a current limiting resistor. This allows current to flow from anode to cathode when the controlling GPIO is high, illuminating the LED. The pin designation 'C' for cathode matches the datasheet pin functions (page 4-5) which describes pin 1 as the cathode connection for single color LEDs.D25 - 5988140107F ✅
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Anode connected to microcontroller GPIO PC1 through 1k current limiting resistor for LED drive control.
The anode is connected to net NetD25_A, which traces to resistor R36 pin 2. R36 is a 1k ohm current limiting resistor with its other end (pin 1) connected to LED_Y net, which connects to microcontroller U11A pin 55 (PC1). This is a correct LED drive configuration where the microcontroller GPIO can control the LED by outputting high (3.3V) to turn it on or low (0V) to turn it off. The datasheet (page 1) specifies that LEDs require 'appropriate current limiting resistor based on forward voltage and desired current'. With a forward voltage of 2.0V (from part attributes) and 3.3V GPIO output, the current would be (3.3V - 2.0V) / 1000Ω = 1.3mA, which is appropriate for this LED. The pin designation 'A' for anode matches the datasheet pin functions (page 4-5) which describes pin 2 as the anode connection for single color LEDs.Cathode correctly connected to ground for proper LED operation.
The cathode is connected to the GND net, which is the correct connection for LED operation. In a standard LED configuration, the cathode should be connected to the lower potential (ground) while the anode is connected to the higher potential through a current limiting resistor. This allows current to flow from anode to cathode when the controlling GPIO is high, illuminating the LED. The pin designation 'C' for cathode matches the datasheet pin functions (page 4-5) which describes pin 1 as the cathode connection for single color LEDs.D5 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS4. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS4 (U11A pin 85, PA2/TIOA1/NANDRDY/AD0). This follows the correct diode OR-gate pattern where the bus signal (CS_TCBUS) can pull the individual chip select (TC_nCS4) low when active, while the diode blocks reverse current when the bus is inactive. The BAT54WX datasheet (page 1) shows this is a Schottky diode with anode and cathode pins, and its low forward voltage drop (0.24V-0.80V depending on current) and fast switching (5ns recovery time) make it suitable for digital logic applications. The 10K pull-up resistor R95 on CS_TCBUS ensures proper logic levels. This configuration prevents SPI bus conflicts by allowing only the thermocouple bus to control TC_nCS4 when CS_TCBUS is asserted low.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS4. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS4 (U11A pin 85, PA2/TIOA1/NANDRDY/AD0). This follows the correct diode OR-gate pattern where the bus signal (CS_TCBUS) can pull the individual chip select (TC_nCS4) low when active, while the diode blocks reverse current when the bus is inactive. The BAT54WX datasheet (page 1) shows this is a Schottky diode with anode and cathode pins, and its low forward voltage drop (0.24V-0.80V depending on current) and fast switching (5ns recovery time) make it suitable for digital logic applications. The 10K pull-up resistor R95 on CS_TCBUS ensures proper logic levels. This configuration prevents SPI bus conflicts by allowing only the thermocouple bus to control TC_nCS4 when CS_TCBUS is asserted low.D30 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS2. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS2 (U11A pin 127, PB9/EMDIO). This follows the same correct diode OR-gate pattern as other thermocouple bus chip selects. The BAT54WX specifications from the datasheet (page 1) show it can handle the logic level voltages and currents in this application. The diode allows CS_TCBUS to pull TC_nCS2 low when the thermocouple bus is active, while preventing reverse current flow that could cause bus conflicts. The pull-up resistor R95 on CS_TCBUS maintains proper inactive logic levels.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS2. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS2 (U11A pin 127, PB9/EMDIO). This follows the same correct diode OR-gate pattern as other thermocouple bus chip selects. The BAT54WX specifications from the datasheet (page 1) show it can handle the logic level voltages and currents in this application. The diode allows CS_TCBUS to pull TC_nCS2 low when the thermocouple bus is active, while preventing reverse current flow that could cause bus conflicts. The pull-up resistor R95 on CS_TCBUS maintains proper inactive logic levels.D31 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS3. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS3 (U11A pin 82, PA6/TIOB2/NCS0/AD3). This maintains the consistent diode OR-gate implementation for the thermocouple bus. The BAT54WX datasheet (page 1) specifications confirm this diode is appropriate for the application with its 30V maximum reverse voltage and low forward drop. The connection allows proper SPI bus arbitration where CS_TCBUS can control TC_nCS3 while preventing conflicts with other buses through the diode's unidirectional current flow.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS3. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS3 (U11A pin 82, PA6/TIOB2/NCS0/AD3). This maintains the consistent diode OR-gate implementation for the thermocouple bus. The BAT54WX datasheet (page 1) specifications confirm this diode is appropriate for the application with its 30V maximum reverse voltage and low forward drop. The connection allows proper SPI bus arbitration where CS_TCBUS can control TC_nCS3 while preventing conflicts with other buses through the diode's unidirectional current flow.D40 - BAT54WX ✅
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📄 DRCY referred to this Datasheet for this component.
Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS6. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS6 (U11A pin 119, PB4/ECRSDV/ERXDV). This implements the same OR-gate logic for the motor 2 bus as seen in the thermocouple bus diodes. The BAT54WX datasheet (page 1) shows suitable characteristics for this digital switching application. The 10K pull-up resistor R97 on CS_M2BUS ensures proper logic levels. This configuration allows the motor 2 bus to control M_nCS6 when CS_M2BUS is asserted, while the diode prevents reverse current that could cause SPI bus conflicts with other buses.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS6. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS6 (U11A pin 119, PB4/ECRSDV/ERXDV). This implements the same OR-gate logic for the motor 2 bus as seen in the thermocouple bus diodes. The BAT54WX datasheet (page 1) shows suitable characteristics for this digital switching application. The 10K pull-up resistor R97 on CS_M2BUS ensures proper logic levels. This configuration allows the motor 2 bus to control M_nCS6 when CS_M2BUS is asserted, while the diode prevents reverse current that could cause SPI bus conflicts with other buses.D41 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS7. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS7 (U11A pin 13, PD0/A10/MCDA4). This follows the established pattern for motor 2 bus chip select management. The BAT54WX specifications from the datasheet (page 1) are appropriate for this logic level application with fast switching and low forward voltage drop. The diode allows CS_M2BUS to pull M_nCS7 low when the motor 2 bus is active, while blocking reverse current to prevent interference with other SPI buses.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS7. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS7 (U11A pin 13, PD0/A10/MCDA4). This follows the established pattern for motor 2 bus chip select management. The BAT54WX specifications from the datasheet (page 1) are appropriate for this logic level application with fast switching and low forward voltage drop. The diode allows CS_M2BUS to pull M_nCS7 low when the motor 2 bus is active, while blocking reverse current to prevent interference with other SPI buses.D60 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS5. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS5 (U11A pin 120, PB5/ERX0). This maintains consistency with the motor 2 bus OR-gate implementation. The BAT54WX datasheet (page 1) confirms the diode can handle the required voltages and switching speeds for this digital application. The connection properly allows CS_M2BUS control over M_nCS5 while preventing bus conflicts through unidirectional current flow.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS5. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS5 (U11A pin 120, PB5/ERX0). This maintains consistency with the motor 2 bus OR-gate implementation. The BAT54WX datasheet (page 1) confirms the diode can handle the required voltages and switching speeds for this digital application. The connection properly allows CS_M2BUS control over M_nCS5 while preventing bus conflicts through unidirectional current flow.D61 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS1. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS1 (U11A pin 138, PC27/A6/TCLK6). This follows the correct thermocouple bus OR-gate pattern established by the other TC bus diodes. The BAT54WX specifications from the datasheet (page 1) are suitable for this logic switching application. The diode allows CS_TCBUS to control TC_nCS1 when the thermocouple bus is active, while preventing reverse current flow that could cause SPI bus conflicts.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS1. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS1 (U11A pin 138, PC27/A6/TCLK6). This follows the correct thermocouple bus OR-gate pattern established by the other TC bus diodes. The BAT54WX specifications from the datasheet (page 1) are suitable for this logic switching application. The diode allows CS_TCBUS to control TC_nCS1 when the thermocouple bus is active, while preventing reverse current flow that could cause SPI bus conflicts.D62 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS5. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS5 (U11A pin 88, PB17/RF/PWML1/AD10). This completes the thermocouple bus OR-gate implementation with the same correct pattern as other TC bus diodes. The BAT54WX datasheet (page 1) shows appropriate characteristics for digital switching with low forward voltage and fast recovery time. The connection allows proper SPI bus arbitration where CS_TCBUS can control TC_nCS5 while the diode prevents conflicts with other buses.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_TCBUS to TC_nCS5. The connection is correct for preventing bus conflicts.
The anode connects to CS_TCBUS and cathode connects to TC_nCS5 (U11A pin 88, PB17/RF/PWML1/AD10). This completes the thermocouple bus OR-gate implementation with the same correct pattern as other TC bus diodes. The BAT54WX datasheet (page 1) shows appropriate characteristics for digital switching with low forward voltage and fast recovery time. The connection allows proper SPI bus arbitration where CS_TCBUS can control TC_nCS5 while the diode prevents conflicts with other buses.D63 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS8. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS8 (U11A pin 15, PD2/A12/MCDA6). This completes the motor 2 bus OR-gate implementation following the established pattern. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital logic application. The diode allows CS_M2BUS to control M_nCS8 when the motor 2 bus is active, while preventing reverse current that could interfere with other SPI buses.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M2BUS to M_nCS8. The connection is correct for preventing bus conflicts.
The anode connects to CS_M2BUS and cathode connects to M_nCS8 (U11A pin 15, PD2/A12/MCDA6). This completes the motor 2 bus OR-gate implementation following the established pattern. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital logic application. The diode allows CS_M2BUS to control M_nCS8 when the motor 2 bus is active, while preventing reverse current that could interfere with other SPI buses.D70 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS1. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS1 (U11A pin 83, PA4/TCLK1/NWAIT/AD2). This implements the OR-gate logic for the motor 1 bus, following the same pattern as the thermocouple and motor 2 buses. The BAT54WX datasheet (page 1) shows suitable characteristics for this application. The 10K pull-up resistor R100 on CS_M1BUS ensures proper logic levels. The diode allows CS_M1BUS to control M_nCS1 while preventing reverse current flow that could cause SPI bus conflicts.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS1. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS1 (U11A pin 83, PA4/TCLK1/NWAIT/AD2). This implements the OR-gate logic for the motor 1 bus, following the same pattern as the thermocouple and motor 2 buses. The BAT54WX datasheet (page 1) shows suitable characteristics for this application. The 10K pull-up resistor R100 on CS_M1BUS ensures proper logic levels. The diode allows CS_M1BUS to control M_nCS1 while preventing reverse current flow that could cause SPI bus conflicts.D74 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS2. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS2 (U11A pin 96, PC14/D12/ERXCK). This continues the motor 1 bus OR-gate implementation with the correct diode orientation. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital switching application with fast switching and low forward voltage drop. The connection allows CS_M1BUS to control M_nCS2 when the motor 1 bus is active, while the diode blocks reverse current to prevent bus conflicts.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS2. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS2 (U11A pin 96, PC14/D12/ERXCK). This continues the motor 1 bus OR-gate implementation with the correct diode orientation. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital switching application with fast switching and low forward voltage drop. The connection allows CS_M1BUS to control M_nCS2 when the motor 1 bus is active, while the diode blocks reverse current to prevent bus conflicts.D75 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS3. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS3 (U11A pin 100, PC18/NWR0/NWE/PWMH6). This maintains the established motor 1 bus OR-gate pattern. The BAT54WX datasheet (page 1) confirms the diode specifications are suitable for this logic level application. The connection properly allows CS_M1BUS control over M_nCS3 while preventing reverse current flow that could cause SPI bus interference.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS3. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS3 (U11A pin 100, PC18/NWR0/NWE/PWMH6). This maintains the established motor 1 bus OR-gate pattern. The BAT54WX datasheet (page 1) confirms the diode specifications are suitable for this logic level application. The connection properly allows CS_M1BUS control over M_nCS3 while preventing reverse current flow that could cause SPI bus interference.D76 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS4. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS4 (U11A pin 128, PB10/UOTGVBOF/A18). This follows the correct motor 1 bus OR-gate implementation pattern. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital switching application. The diode allows CS_M1BUS to control M_nCS4 when the motor 1 bus is active, while blocking reverse current to prevent conflicts with other SPI buses. Note that M_nCS4 connects to a different microcontroller pin than TC_nCS4, avoiding any net conflicts.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to M_nCS4. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to M_nCS4 (U11A pin 128, PB10/UOTGVBOF/A18). This follows the correct motor 1 bus OR-gate implementation pattern. The BAT54WX specifications from the datasheet (page 1) are appropriate for this digital switching application. The diode allows CS_M1BUS to control M_nCS4 when the motor 1 bus is active, while blocking reverse current to prevent conflicts with other SPI buses. Note that M_nCS4 connects to a different microcontroller pin than TC_nCS4, avoiding any net conflicts.D77 - BAT54WX ✅
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Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to SPIFLASH_CS. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to SPIFLASH_CS (U11A pin 92, PB21/RXD2/SPI0_NPCS2/AD14/WKUP13). This allows the motor 1 bus to control the SPI flash chip select, which makes sense as the SPI flash (U12) is part of the motor 1 bus infrastructure. The BAT54WX datasheet (page 1) shows appropriate characteristics for this application. The diode allows CS_M1BUS to control the SPI flash while preventing reverse current that could interfere with other buses. This connection enables the SPI flash to be accessed through the motor 1 bus arbitration system.Schottky diode implementing OR-gate logic for SPI bus chip select management, connecting CS_M1BUS to SPIFLASH_CS. The connection is correct for preventing bus conflicts.
The anode connects to CS_M1BUS and cathode connects to SPIFLASH_CS (U11A pin 92, PB21/RXD2/SPI0_NPCS2/AD14/WKUP13). This allows the motor 1 bus to control the SPI flash chip select, which makes sense as the SPI flash (U12) is part of the motor 1 bus infrastructure. The BAT54WX datasheet (page 1) shows appropriate characteristics for this application. The diode allows CS_M1BUS to control the SPI flash while preventing reverse current that could interfere with other buses. This connection enables the SPI flash to be accessed through the motor 1 bus arbitration system.D1 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of ERASE signal.
The anode is connected to GND while the cathode (C pin) is connected to the ERASE signal line. This is the correct configuration for an ESD protection diode - during normal operation, the diode is reverse biased and does not conduct. During an ESD event, the diode will conduct to shunt the ESD current to ground, protecting the ERASE signal line and any downstream circuitry. Without the component datasheet, I'm relying on standard ESD protection diode practices, but this configuration matches typical implementations.Cathode connected to ERASE signal line for ESD protection.
The cathode is connected to the ERASE signal line while the anode (A pin) is connected to GND. This creates the proper ESD protection configuration where the diode is normally reverse biased during operation but will conduct during ESD events to protect the signal line. The ERASE signal appears to be a control signal that could be exposed to external connections, making ESD protection appropriate.D42 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SDCD signal.
The anode is connected to GND while the cathode (C pin) is connected to the SDCD (SD card detect) signal. This is the correct configuration for ESD protection of the SD card detect signal. The SD card interface is exposed to external connections through the SD card connector, making it susceptible to ESD events. The diode will remain reverse biased during normal operation and conduct during ESD events to protect the signal line.Cathode connected to SDCD signal line for ESD protection.
The cathode is connected to the SDCD signal line while the anode is connected to GND. This provides ESD protection for the SD card detect signal, which is appropriate since this signal comes from the external SD card connector (J18) and could be exposed to ESD events during card insertion/removal. The configuration is correct for standard ESD protection.D44 - ESD9X3.3ST5G ✅
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Anode connected to GND for power rail ESD protection.
The anode is connected to GND while the cathode (K pin) is connected to the 3.3VCC power rail. This configuration provides ESD protection for the 3.3V power supply rail. During normal operation, the diode is reverse biased. During positive ESD events on the power rail, the diode will conduct to shunt excess current to ground, protecting downstream circuitry. This is a standard power rail ESD protection configuration.Cathode connected to 3.3VCC power rail for ESD protection.
The cathode is connected to the 3.3VCC power rail while the anode is connected to GND. This provides ESD protection for the 3.3V supply rail, which is appropriate since power rails can be exposed to ESD events through external connections. The diode will clamp positive ESD transients on the power rail to protect sensitive downstream components. This is a correct implementation of power rail ESD protection.D45 - DF2S6.8FS,L3M ✅
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Anode connected to GND for 5V power rail ESD protection using 6.8V Zener diode.
The anode is connected to GND while the cathode (K pin) is connected to the +5VCC power rail. According to the datasheet (page 1), this is a 6.8V Zener diode with a working peak reverse voltage (VRWM) of 5V max and Zener voltage (VZ) of 6.8V typical. This configuration is correct for protecting a 5V power rail - the 6.8V Zener voltage is appropriately higher than the 5V operating voltage, allowing normal operation while providing ESD protection. During ESD events exceeding 6.8V, the diode will conduct to clamp the voltage and protect downstream circuitry.Cathode connected to +5VCC power rail for ESD protection using 6.8V Zener diode.
The cathode is connected to the +5VCC power rail while the anode is connected to GND. Based on the datasheet (page 1), this DF2S6.8FS device has a Zener voltage of 6.8V typical with a working peak reverse voltage of 5V max. This makes it suitable for protecting a 5V power rail - the device will remain non-conducting during normal 5V operation but will clamp voltages above 6.8V during ESD events. The pin configuration matches the datasheet (page 1) which shows pin 1 as cathode and pin 2 as anode.D64 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card data line MCDA1.
The anode is connected to GND while the cathode (C pin) is connected to the MCDA1 signal. This provides ESD protection for the SD card data line 1, which is exposed through the SD card connector (J18). SD card interfaces are particularly susceptible to ESD events during card insertion and removal. The diode configuration is correct for standard ESD protection.Cathode connected to MCDA1 signal line for ESD protection.
The cathode is connected to the MCDA1 (SD card data line 1) signal while the anode is connected to GND. This signal connects to pin 8 of the SD card connector (J18) and then to pin 107 of the microcontroller (U11A). The ESD protection is appropriate for this external interface signal that could experience ESD events during SD card handling.D65 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card data line MCDA0.
The anode is connected to GND while the cathode (C pin) is connected to the MCDA0 signal. This provides ESD protection for the SD card data line 0, which is exposed through the SD card connector (J18). The configuration follows standard ESD protection practices for external interface signals.Cathode connected to MCDA0 signal line for ESD protection.
The cathode is connected to the MCDA0 (SD card data line 0) signal while the anode is connected to GND. This signal connects to pin 7 of the SD card connector (J18) and then to pin 107 of the microcontroller (U11A). The ESD protection is necessary for this external interface that could be exposed to ESD events during SD card insertion/removal.D66 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card command line MCCDA.
The anode is connected to GND while the cathode (C pin) is connected to the MCCDA signal. This provides ESD protection for the SD card command line, which is exposed through the SD card connector (J18). The command line is critical for SD card communication and requires protection from ESD events.Cathode connected to MCCDA signal line for ESD protection.
The cathode is connected to the MCCDA (SD card command line) signal while the anode is connected to GND. This signal connects to pin 3 of the SD card connector (J18) and then to pin 72 of the microcontroller (U11A). ESD protection on the command line is essential since it's part of the external SD card interface.D67 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card clock line MCCK.
The anode is connected to GND while the cathode (C pin) is connected to the MCCK signal. This provides ESD protection for the SD card clock line, which is exposed through the SD card connector (J18). Clock lines are particularly sensitive and benefit from ESD protection.Cathode connected to MCCK signal line for ESD protection.
The cathode is connected to the MCCK (SD card clock line) signal while the anode is connected to GND. This signal connects to pin 5 of the SD card connector (J18) and then to pin 71 of the microcontroller (U11A). ESD protection on the clock line is important since clock signals are sensitive to noise and disturbances that could be caused by ESD events.D68 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card data line MCDA3.
The anode is connected to GND while the cathode (C pin) is connected to the MCDA3 signal. This provides ESD protection for the SD card data line 3, which is exposed through the SD card connector (J18). This completes the ESD protection for all SD card data lines.Cathode connected to MCDA3 signal line for ESD protection.
The cathode is connected to the MCDA3 (SD card data line 3) signal while the anode is connected to GND. This signal connects to pin 2 of the SD card connector (J18) and then to pin 79 of the microcontroller (U11A). ESD protection is appropriate for this external interface signal.D69 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of SD card data line MCDA2.
The anode is connected to GND while the cathode (C pin) is connected to the MCDA2 signal. This provides ESD protection for the SD card data line 2, which is exposed through the SD card connector (J18). This is part of the comprehensive ESD protection for the SD card interface.Cathode connected to MCDA2 signal line for ESD protection.
The cathode is connected to the MCDA2 (SD card data line 2) signal while the anode is connected to GND. This signal connects to pin 1 of the SD card connector (J18) and then to pin 80 of the microcontroller (U11A). ESD protection is necessary for this external interface signal that could experience ESD events during SD card handling.D71 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of reset signal NRST.
The anode is connected to GND while the cathode (C pin) is connected to the NRST signal. This provides ESD protection for the reset signal, which is exposed through external connectors (J4 pin 10 and J28 pin 6). Reset signals are critical for system operation and require protection from ESD events that could cause unwanted resets or damage.Cathode connected to NRST signal line for ESD protection.
The cathode is connected to the NRST (reset) signal while the anode is connected to GND. This signal is exposed through multiple external connectors including the JTAG header (J4) and programming header (J28), making it susceptible to ESD events. The reset signal is critical for proper system operation, so ESD protection is essential to prevent unwanted resets or damage to the reset circuitry.D72 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of UART transmit signal PA9_UTXD.
The anode is connected to GND while the cathode (C pin) is connected to the PA9_UTXD signal. This provides ESD protection for the UART transmit line, which is exposed through external connector J28 pin 2. UART signals are commonly exposed to external connections and require ESD protection.Cathode connected to PA9_UTXD signal line for ESD protection.
The cathode is connected to the PA9_UTXD (UART transmit) signal while the anode is connected to GND. This signal connects from pin 2 of the microcontroller (U11A) to pin 2 of external connector J28. Since this is a communication interface that could be connected to external devices, ESD protection is appropriate to prevent damage from electrostatic discharge events.D73 - ESD9X3.3ST5G ✅
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Anode connected to GND for ESD protection of UART receive signal PA8_URXD.
The anode is connected to GND while the cathode (C pin) is connected to the PA8_URXD signal. This provides ESD protection for the UART receive line, which is exposed through external connector J28 pin 4. Input signals like UART receive are particularly vulnerable to ESD damage and benefit from protection.Cathode connected to PA8_URXD signal line for ESD protection.
The cathode is connected to the PA8_URXD (UART receive) signal while the anode is connected to GND. This signal connects from pin 27 of the microcontroller (U11A) to pin 4 of external connector J28. As a receive signal on an external communication interface, this line is susceptible to ESD events from connected devices, making the ESD protection necessary and correctly implemented.RV1 - AVRM0603C6R8NT101N ✅
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Varistor connected between PB0_ETXCK signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_20, which traces through J20 pin 20 and R153 to the PB0_ETXCK signal (U11A pin 113, PB0/ETXCK/EREFCK - Ethernet transmit clock). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the device is bidirectional, equivalent to '2 serial connected zener diodes without polarity'. The application info (page 3) states to 'Insert varistor between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly provides ESD protection for the Ethernet transmit clock signal, which is an I/O signal that could be exposed to external connections. The 6.8V varistor rating is appropriate for 3.3V logic levels, providing protection without interfering with normal operation.Varistor connected between PB0_ETXCK signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_20, which traces through J20 pin 20 and R153 to the PB0_ETXCK signal (U11A pin 113, PB0/ETXCK/EREFCK - Ethernet transmit clock). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the device is bidirectional, equivalent to '2 serial connected zener diodes without polarity'. The application info (page 3) states to 'Insert varistor between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly provides ESD protection for the Ethernet transmit clock signal, which is an I/O signal that could be exposed to external connections. The 6.8V varistor rating is appropriate for 3.3V logic levels, providing protection without interfering with normal operation.RV2 - AVRM0603C6R8NT101N ✅
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Varistor connected between PB13_AD9 signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_19, which traces through J20 pin 19 and R159 to the PB13_AD9 signal (U11A pin 87, PB13/TWCK1/PWMH1/AD9 - ADC input 9 with TWI clock and PWM functionality). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the device is bidirectional. The application info (page 3) recommends connecting varistors 'between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly provides ESD protection for the ADC input signal, which could be exposed to external analog inputs and benefit from surge protection. The 6.8V varistor rating is suitable for protecting 3.3V analog inputs.Varistor connected between PB13_AD9 signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_19, which traces through J20 pin 19 and R159 to the PB13_AD9 signal (U11A pin 87, PB13/TWCK1/PWMH1/AD9 - ADC input 9 with TWI clock and PWM functionality). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the device is bidirectional. The application info (page 3) recommends connecting varistors 'between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly provides ESD protection for the ADC input signal, which could be exposed to external analog inputs and benefit from surge protection. The 6.8V varistor rating is suitable for protecting 3.3V analog inputs.RV3 - AVRM0603C6R8NT101N ✅
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📄 DRCY referred to this Datasheet for this component.
Varistor connected between PB2_ETX0 signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_15, which traces through J20 pin 15 and R161 to the PB2_ETX0 signal (U11A pin 115, PB2/ETX0 - Ethernet transmit data 0). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the component is bidirectional, functioning as 'equivalent to 2 serial connected zener diodes without polarity'. The application guidance (page 3) specifies to 'Insert varistor between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This implementation correctly provides ESD protection for the Ethernet transmit data signal, which is an I/O signal that could be exposed to external Ethernet connections and requires protection from transients. The 6.8V varistor specification is appropriate for 3.3V logic signal protection.Varistor connected between PB2_ETX0 signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_15, which traces through J20 pin 15 and R161 to the PB2_ETX0 signal (U11A pin 115, PB2/ETX0 - Ethernet transmit data 0). Pin 2 connects to GND. According to the datasheet (page 3), both pins are 'Varistor terminal electrode' and the component is bidirectional, functioning as 'equivalent to 2 serial connected zener diodes without polarity'. The application guidance (page 3) specifies to 'Insert varistor between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This implementation correctly provides ESD protection for the Ethernet transmit data signal, which is an I/O signal that could be exposed to external Ethernet connections and requires protection from transients. The 6.8V varistor specification is appropriate for 3.3V logic signal protection.RV4 - AVRM0603C6R8NT101N ✅
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📄 DRCY referred to this Datasheet for this component.
Varistor connected between PB1_ETXEN signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_16, which traces through J20 pin 16 and R160 to the PB1_ETXEN signal (U11A pin 114, PB1/ETXEN - Ethernet transmit enable). Pin 2 connects to GND. According to the datasheet (page 3), both terminals are 'Varistor terminal electrode' and the device operates bidirectionally without polarity requirements. The application information (page 3) recommends connecting varistors 'between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly implements ESD protection for the Ethernet transmit enable signal, which is an I/O signal that interfaces with external Ethernet circuitry and requires protection from electrical transients. The 6.8V varistor rating provides appropriate clamping for 3.3V logic signals without affecting normal operation.Varistor connected between PB1_ETXEN signal and ground for ESD protection. Connection is correct as varistors are bidirectional.
Pin 1 connects to NetJ20_16, which traces through J20 pin 16 and R160 to the PB1_ETXEN signal (U11A pin 114, PB1/ETXEN - Ethernet transmit enable). Pin 2 connects to GND. According to the datasheet (page 3), both terminals are 'Varistor terminal electrode' and the device operates bidirectionally without polarity requirements. The application information (page 3) recommends connecting varistors 'between signal/power line and ground to suppress abnormal voltage and protect electronic equipment from ESD, surge voltage'. This configuration correctly implements ESD protection for the Ethernet transmit enable signal, which is an I/O signal that interfaces with external Ethernet circuitry and requires protection from electrical transients. The 6.8V varistor rating provides appropriate clamping for 3.3V logic signals without affecting normal operation.Q12A - NCV8402AD ✅
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Source pin correctly connected to ground for low-side switching operation.
Pin 1 (S) is connected to the GND net. For a low-side MOSFET driver configuration, the source should be connected to ground, which allows the MOSFET to switch the load between the drain and ground when the gate is driven high. This connection is correct for the intended low-side switching application.Gate pin correctly connected to gate drive resistor R98 for proper MOSFET control.
Pin 2 (G) connects to NetQ12_2, which connects to R98 pin 2. R98 pin 1 connects to NetR98_1, which traces to U2D pin 11 (4Y output). This creates a proper gate drive path from the buffer output through a 100Ω gate resistor to the MOSFET gate. The 100Ω resistor provides appropriate gate drive current limiting and EMI reduction. This connection is correct.Drain pin correctly connected to switched load including LED1 cathode and fan connector.
Pin 7 (D) connects to NetC154_2, which connects to LED1 cathode (pin C), test point TP8, fan connector J29 pin 1, and capacitor C154 pin 2. This configuration allows Q12A to control LED1 and the fan connected to J29 by switching the cathode/negative terminal to ground when the MOSFET turns on. The LED anode connects through current limiting resistor R96 to VFAN, creating a proper LED drive circuit. This connection is correct for low-side switching.Q12B - NCV8402AD ✅
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Source pin correctly connected to ground for low-side switching operation.
Pin 3 (S) is connected to the GND net. For a low-side MOSFET driver configuration, the source should be connected to ground, which allows the MOSFET to switch the load between the drain and ground when the gate is driven high. This connection is correct for the intended low-side switching application.Gate pin correctly connected to gate drive resistor R99 for proper MOSFET control.
Pin 4 (G) connects to NetQ12_4, which connects to R99 pin 2. R99 pin 1 connects to NetR99_1, which traces to U2C pin 8 (3Y output). This creates a proper gate drive path from the buffer output through a 100Ω gate resistor to the MOSFET gate. The 100Ω resistor provides appropriate gate drive current limiting and EMI reduction. This connection is correct.Drain pin correctly connected to switched load including LED2 cathode and fan connector.
Pin 5 (D) connects to NetC153_2, which connects to LED2 cathode (pin C), test point TP2, fan connector J22 pin 1, and capacitor C153 pin 2. This configuration allows Q12B to control LED2 and the fan connected to J22 by switching the cathode/negative terminal to ground when the MOSFET turns on. The LED anode connects through current limiting resistor R12 to VFAN, creating a proper LED drive circuit. This connection is correct for low-side switching.Q13A - NCV8402AD ✅
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Source pin correctly connected to ground for low-side switching operation.
Pin 1 (S) is connected to the GND net. For a low-side MOSFET driver configuration, the source should be connected to ground, which allows the MOSFET to switch the load between the drain and ground when the gate is driven high. This connection is correct for the intended low-side switching application.Gate pin correctly connected to gate drive resistor R180 for proper MOSFET control.
Pin 2 (G) connects to NetQ13_2, which connects to R180 pin 2. R180 pin 1 connects to NetR180_1, which traces to U2B pin 6 (2Y output). This creates a proper gate drive path from the buffer output through a 100Ω gate resistor to the MOSFET gate. The 100Ω resistor provides appropriate gate drive current limiting and EMI reduction. This connection is correct.Drain pin correctly connected to switched load including LED3 cathode and fan connector.
Pin 7 (D) connects to NetC211_2, which connects to LED3 cathode (pin C), test point TP18, fan connector J31 pin 1, and capacitor C211 pin 2. This configuration allows Q13A to control LED3 and the fan connected to J31 by switching the cathode/negative terminal to ground when the MOSFET turns on. The LED anode connects through current limiting resistor R15 to VFAN, creating a proper LED drive circuit. This connection is correct for low-side switching.Q13B - NCV8402AD ❌
DRCY flagged 1 potential issues in this component.
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Drain pin incorrectly connected to VFAN power supply, which would create a short circuit when the MOSFET turns on.
Source pin correctly connected to ground for low-side switching operation.
Pin 3 (S) is connected to the GND net. For a low-side MOSFET driver configuration, the source should be connected to ground, which allows the MOSFET to switch the load between the drain and ground when the gate is driven high. This connection is correct for the intended low-side switching application.Gate pin correctly connected to gate drive resistor R181 for proper MOSFET control.
Pin 4 (G) connects to NetQ13_4, which connects to R181 pin 2. R181 pin 1 connects to NetR181_1, which traces to U2A pin 3 (1Y output). This creates a proper gate drive path from the buffer output through a 100Ω gate resistor to the MOSFET gate. The 100Ω resistor provides appropriate gate drive current limiting and EMI reduction. This connection is correct.U2A - SN74AHCT125 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Output enable pin connected to GND to permanently enable the buffer output.
Pin 1 (1OE) is connected to GND net. The SN74AHCT125 has active-low output enable inputs, so connecting OE to ground permanently enables the buffer output. This allows the input signal on pin 2 to pass through to the output on pin 3. This is a correct connection for a buffer that needs to be always enabled.Input pin correctly connected to Fan4 control signal from microcontroller.
Pin 2 (1A) is connected to the Fan4 net, which carries the fan control signal from the microcontroller. This is the correct connection for the buffer input, allowing the microcontroller signal to be conditioned and amplified before driving the MOSFET gate.Output pin correctly connected through current-limiting resistor to MOSFET gate.
Pin 3 (1Y) is connected to NetR181_1, which connects to R181 pin 1. R181 (100Ω) pin 2 connects to NetQ13_4, which drives Q13B pin 4 (gate). This creates a proper signal path from the buffer output through a current-limiting resistor to the MOSFET gate, providing appropriate drive capability and protection.U2B - SN74AHCT125 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Output enable pin connected to GND to permanently enable the buffer output.
Pin 4 (2OE) is connected to GND net. This permanently enables the second buffer channel by asserting the active-low output enable signal. This is correct for a buffer that needs to be always active.Input pin correctly connected to Fan3 control signal from microcontroller.
Pin 5 (2A) is connected to the Fan3 net, which carries the fan control signal from the microcontroller. This is the proper input connection for the second buffer channel.Output pin correctly connected through current-limiting resistor to MOSFET gate.
Pin 6 (2Y) is connected to NetR180_1, which connects to R180 pin 1. R180 (100Ω) pin 2 connects to NetQ13_2, which drives Q13A pin 2 (gate). This provides the buffered output signal through appropriate current limiting to the MOSFET gate.U2C - SN74AHCT125 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Output pin correctly connected through current-limiting resistor to MOSFET gate.
Pin 8 (3Y) is connected to NetR99_1, which connects to R99 pin 1. R99 (100Ω) pin 2 connects to NetQ12_4, which drives Q12B pin 4 (gate). This follows the same correct pattern as the other buffer outputs, providing proper drive through current limiting.Input pin correctly connected to FAN2 control signal from microcontroller.
Pin 9 (3A) is connected to the FAN2 net, which carries the fan control signal from the microcontroller. This is the correct input connection for the third buffer channel.Output enable pin connected to GND to permanently enable the buffer output.
Pin 10 (3OE) is connected to GND net. This permanently enables the third buffer channel by asserting the active-low output enable signal. This is correct for continuous buffer operation.U2D - SN74AHCT125 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Output pin correctly connected through current-limiting resistor to MOSFET gate.
Pin 11 (4Y) is connected to NetR98_1, which connects to R98 pin 1. R98 (100Ω) pin 2 connects to NetQ12_2, which drives Q12A pin 2 (gate). This maintains the consistent design pattern of buffered output through current limiting to MOSFET gates.Input pin correctly connected to FAN1 control signal from microcontroller.
Pin 12 (4A) is connected to the FAN1 net, which carries the fan control signal from the microcontroller. This is the proper input connection for the fourth buffer channel.Output enable pin connected to GND to permanently enable the buffer output.
Pin 13 (4OE) is connected to GND net. This permanently enables the fourth buffer channel by asserting the active-low output enable signal. This is correct for always-on buffer operation.U2E - SN74AHCT125 ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Ground pin correctly connected to system ground.
Pin 7 (GND) is connected to the GND net, providing the ground reference for the IC. This is the correct power connection for proper IC operation.Power supply pin correctly connected to +5VCC.
Pin 14 (VCC) is connected to +5VCC net. The SN74AHCT125 is designed to operate with a 5V supply, so this connection provides the correct operating voltage for the IC.Thermal pad connected to SNTP1 net, likely for thermal monitoring or testing.
Pin 15 (PAD) is connected to SNTP1 net. For QFN packages, the thermal pad is typically connected to ground for heat dissipation, but this connection to a separate net suggests it may be used for thermal monitoring or as a test point. Without the datasheet, this appears to be an intentional design choice rather than an error.D50 - BAT54WX ✅
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Anode connected to NetD50_A for upper voltage clamping of TACH_1 signal conditioning circuit.
The anode is connected to NetD50_A, which is the intermediate node in the TACH_1 signal conditioning circuit. This node connects to R175 (1K resistor to connector), R174 (1K resistor to TACH_1 signal), and D52 cathode (lower clamp diode). According to the datasheet (page 1), pin 1 is the anode (positive terminal). This configuration creates an upper voltage clamp where the diode conducts when the signal voltage exceeds 3.3V + Vf (approximately 3.6-3.7V based on the forward voltage characteristics in the datasheet). This protects downstream circuitry from overvoltage conditions on the tachometer input.Cathode correctly connected to 3.3VCC for upper voltage clamping function.
The cathode is connected to 3.3VCC, which is the positive supply rail. According to the datasheet (page 1), pin 2 is the cathode (negative terminal, marked with cathode band). For proper upper voltage clamping, the cathode must be connected to the positive rail so the diode conducts when the signal exceeds the supply voltage plus the forward drop. This connection is correct for the intended clamping function and matches standard Schottky diode clamping circuit topology.D51 - BAT54WX ✅
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Anode connected to NetD51_A for upper voltage clamping of TACH_2 signal conditioning circuit.
The anode is connected to NetD51_A, which serves as the intermediate node in the TACH_2 signal conditioning circuit. This node connects to R177 (1K resistor to connector), R176 (1K resistor to TACH_2 signal), and D53 cathode. According to the datasheet (page 1), pin 1 is the anode (positive terminal). This creates an upper voltage clamp that conducts when the signal voltage exceeds 3.3V + Vf, protecting the TACH_2 input from overvoltage conditions. The connection is correct for the upper clamping function.Cathode correctly connected to 3.3VCC for upper voltage clamping function.
The cathode is connected to 3.3VCC, the positive supply rail. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). This connection enables proper upper voltage clamping where the diode conducts when the signal exceeds the supply voltage plus forward drop. The connection follows standard Schottky diode clamping circuit design and is correct.D52 - BAT54WX ✅
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Anode correctly connected to GND for lower voltage clamping of TACH_1 signal.
The anode is connected to GND (ground/negative rail). According to the datasheet (page 1), pin 1 is the anode (positive terminal). For proper lower voltage clamping, the anode must be connected to the negative rail so the diode conducts when the signal goes below ground minus the forward drop (approximately -0.3V to -0.4V based on datasheet forward voltage characteristics). This protects the circuit from negative voltage excursions on the TACH_1 input. The connection is correct for lower clamping function.Cathode correctly connected to NetD50_A for lower voltage clamping function.
The cathode is connected to NetD50_A, which is the signal node being protected. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). This configuration allows the diode to conduct when the signal voltage drops below ground minus the forward voltage drop, providing protection against negative voltage transients. This is the correct connection for a lower voltage clamp in the TACH_1 signal conditioning circuit.D53 - BAT54WX ❌
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Anode incorrectly left unconnected, should be connected to GND for proper lower voltage clamping of TACH_2 signal.
Cathode correctly connected to NetD51_A signal node, but circuit is incomplete due to unconnected anode.
D54 - BAT54WX ✅
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Anode connected to NetD54_A for upper voltage clamping of TACH_3 signal conditioning circuit.
The anode is connected to NetD54_A, which is the intermediate node in the TACH_3 signal conditioning circuit. This node connects to R187 (1K resistor to connector), R186 (1K resistor to TACH_3 signal), and D56 cathode (lower clamp diode). According to the datasheet (page 1), pin 1 is the anode (positive terminal). This configuration creates an upper voltage clamp where the diode conducts when the signal voltage exceeds 3.3V + Vf, protecting downstream circuitry from overvoltage conditions on the TACH_3 input. The connection is correct for the upper clamping function.Cathode correctly connected to 3.3VCC for upper voltage clamping function.
The cathode is connected to 3.3VCC, which is the positive supply rail. According to the datasheet (page 1), pin 2 is the cathode (negative terminal, marked with cathode band). For proper upper voltage clamping, the cathode must be connected to the positive rail so the diode conducts when the signal exceeds the supply voltage plus the forward drop. This connection is correct for the intended clamping function and matches the topology used in the other upper clamp diodes (D50, D51, D55).D55 - BAT54WX ✅
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Anode connected to NetD55_A for upper voltage clamping of TACH_4 signal conditioning circuit.
The anode is connected to NetD55_A, which serves as the intermediate node in the TACH_4 signal conditioning circuit. This node connects to R189 (1K resistor to connector), R188 (1K resistor to TACH_4 signal), and D57 cathode (lower clamp diode). According to the datasheet (page 1), pin 1 is the anode (positive terminal). This creates an upper voltage clamp that conducts when the signal voltage exceeds 3.3V + Vf, protecting the TACH_4 input from overvoltage conditions. The connection is correct for the upper clamping function.Cathode correctly connected to 3.3VCC for upper voltage clamping function.
The cathode is connected to 3.3VCC, the positive supply rail. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). This connection enables proper upper voltage clamping where the diode conducts when the signal exceeds the supply voltage plus forward drop. The connection follows the same correct topology as the other upper clamp diodes (D50, D51, D54) and is appropriate for the clamping function.D56 - BAT54WX ✅
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Anode correctly connected to GND for lower voltage clamping of TACH_3 signal.
The anode is connected to GND (ground/negative rail). According to the datasheet (page 1), pin 1 is the anode (positive terminal). For proper lower voltage clamping, the anode must be connected to the negative rail so the diode conducts when the signal goes below ground minus the forward drop. This protects the TACH_3 circuit from negative voltage excursions. The connection matches the topology used in D52 and D57 for the other tachometer channels and is correct for lower clamping function.Cathode correctly connected to NetD54_A for lower voltage clamping function.
The cathode is connected to NetD54_A, which is the signal node being protected in the TACH_3 circuit. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). This configuration allows the diode to conduct when the signal voltage drops below ground minus the forward voltage drop, providing protection against negative voltage transients. This is the correct connection for a lower voltage clamp and matches the topology used in the other functional lower clamp circuits.D57 - BAT54WX ✅
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📄 DRCY referred to this Datasheet for this component.
Anode correctly connected to GND for lower voltage clamping of TACH_4 signal.
The anode is connected to GND (ground/negative rail). According to the datasheet (page 1), pin 1 is the anode (positive terminal). For proper lower voltage clamping, the anode must be connected to the negative rail so the diode conducts when the signal goes below ground minus the forward drop (approximately -0.3V to -0.4V based on datasheet forward voltage characteristics). This protects the TACH_4 circuit from negative voltage excursions. The connection is correct for lower clamping function and matches the working topology used in D52 and D56.Cathode correctly connected to NetD55_A for lower voltage clamping function.
The cathode is connected to NetD55_A, which is the signal node being protected in the TACH_4 circuit. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). This configuration allows the diode to conduct when the signal voltage drops below ground minus the forward voltage drop, providing protection against negative voltage transients. This is the correct connection for a lower voltage clamp in the TACH_4 signal conditioning circuit.J22 - CONN 3POS VERT 0.1" SHRD LOCKING PIP ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Pin 1 is connected to a switched MOSFET output (NetC153_2) instead of ground. This provides switched ground control but is non-standard for typical fan connectors.
Pin 1 connects to NetC153_2, which traces to Q12B pin 5 (drain), C153 pin 2, LED2 cathode, and test point TP2. Q12B is an NCV8402AD low-side driver with its source connected to GND and gate driven by NetQ12_4. When Q12B is enabled, it provides a ground path through the MOSFET. This creates a switched ground configuration for fan control rather than the typical constant ground connection. While this can work for fan speed control, it's non-standard compared to typical PC fan connectors which expect pin 1 to be constant ground and use PWM on the power pin for speed control. The circuit appears intentionally designed this way for low-side switching control.Pin 2 is correctly connected to VFAN for fan power supply.
Pin 2 connects to the VFAN net, which provides power to the fan. This is the correct connection for a fan power pin. VFAN appears throughout the circuit as the main fan supply voltage, connecting to multiple fan-related components including other connector power pins, LED current limiting resistors, and capacitors.Pin 3 is correctly connected to a tachometer signal conditioning circuit.
Pin 3 connects to NetJ22_3, which connects to a voltage divider formed by R173 (1.8K to 3.3VCC) and R177 (1K). R177 connects to NetD51_A, which has clamping diodes D51 (to 3.3VCC) and D53 (to NetD51_A), and connects through R176 (1K) to TACH_2. This forms a proper tachometer input conditioning circuit with pull-up resistor, voltage divider, and clamping protection. The circuit conditions the fan tachometer signal to appropriate logic levels for the receiving circuit.J29 - CONN 3POS VERT 0.1" SHRD LOCKING PIP ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Pin 1 is connected to a switched MOSFET output (NetC154_2) instead of ground. This provides switched ground control but is non-standard for typical fan connectors.
Pin 1 connects to NetC154_2, which traces to Q12A pin 7 (drain), C154 pin 2, LED1 cathode, and test point TP8. Q12A is an NCV8402AD low-side driver with its source connected to GND and gate driven by NetQ12_2. When Q12A is enabled, it provides a ground path through the MOSFET. This creates a switched ground configuration for fan control rather than the typical constant ground connection. While this can work for fan speed control, it's non-standard compared to typical PC fan connectors which expect pin 1 to be constant ground and use PWM on the power pin for speed control. The circuit appears intentionally designed this way for low-side switching control.Pin 2 is correctly connected to VFAN for fan power supply.
Pin 2 connects to the VFAN net, which provides power to the fan. This is the correct connection for a fan power pin. VFAN appears throughout the circuit as the main fan supply voltage, connecting to multiple fan-related components including other connector power pins, LED current limiting resistors, and capacitors.Pin 3 is correctly connected to a tachometer signal conditioning circuit.
Pin 3 connects to NetJ29_3, which connects to a voltage divider formed by R172 (1.8K to 3.3VCC) and R175 (1K). R175 connects to NetD50_A, which has clamping diodes D50 (to 3.3VCC) and D52 (to GND), and connects through R174 (1K) to TACH_1. This forms a proper tachometer input conditioning circuit with pull-up resistor, voltage divider, and clamping protection. The circuit conditions the fan tachometer signal to appropriate logic levels for the receiving circuit.J30 - CONN 3POS VERT 0.1" SHRD LOCKING PIP ❌
DRCY flagged 1 potential issues in this component.
⚠️ DRCY couldn't retrieve a Datasheet for this component.
Both pins 1 and 2 are connected to VFAN, providing no ground reference for the fan. This prevents proper fan operation as there is no return current path.
Both pins 1 and 2 are connected to VFAN, providing no ground reference for the fan. This prevents proper fan operation as there is no return current path.
Pin 3 is correctly connected to a tachometer signal conditioning circuit.
Pin 3 connects to NetJ30_3, which connects to a voltage divider formed by R185 (1.8K to 3.3VCC) and R189 (1K). R189 connects to NetD55_A, which has clamping diodes D55 (to 3.3VCC) and D57 (to GND), and connects through R188 (1K) to TACH_4. This forms a proper tachometer input conditioning circuit with pull-up resistor, voltage divider, and clamping protection. The circuit conditions the fan tachometer signal to appropriate logic levels for the receiving circuit.J31 - CONN 3POS VERT 0.1" SHRD LOCKING PIP ✅
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⚠️ DRCY couldn't retrieve a Datasheet for this component.
Pin 1 is connected to a switched MOSFET output (NetC211_2) instead of ground. This provides switched ground control but is non-standard for typical fan connectors.
Pin 1 connects to NetC211_2, which traces to Q13A pin 7 (drain), C211 pin 2, LED3 cathode, and test point TP18. Q13A is an NCV8402AD low-side driver with its source connected to GND and gate driven by NetQ13_2. When Q13A is enabled, it provides a ground path through the MOSFET. This creates a switched ground configuration for fan control rather than the typical constant ground connection. While this can work for fan speed control, it's non-standard compared to typical PC fan connectors which expect pin 1 to be constant ground and use PWM on the power pin for speed control. The circuit appears intentionally designed this way for low-side switching control.Pin 2 is correctly connected to VFAN for fan power supply.
Pin 2 connects to the VFAN net, which provides power to the fan. This is the correct connection for a fan power pin. VFAN appears throughout the circuit as the main fan supply voltage, connecting to multiple fan-related components including other connector power pins, LED current limiting resistors, and capacitors.Pin 3 is correctly connected to a tachometer signal conditioning circuit.
Pin 3 connects to NetJ31_3, which connects to a voltage divider formed by R184 (1.8K to 3.3VCC) and R187 (1K). R187 connects to NetD54_A, which has clamping diodes D54 (to 3.3VCC) and D56 (to GND), and connects through R186 (1K) to TACH_3. This forms a proper tachometer input conditioning circuit with pull-up resistor, voltage divider, and clamping protection. The circuit conditions the fan tachometer signal to appropriate logic levels for the receiving circuit.LED1 - 5988110107F ✅
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Anode correctly connected to current limiting resistor R96 which connects to VFAN supply.
The anode pin connects to NetLED1_A, which connects to R96 pin 1. R96 pin 2 connects to VFAN supply. This forms a proper current limiting circuit for the LED. According to the datasheet (page 4-5), pin 2 is the Anode for 0402 package LEDs, and it should connect to positive voltage through a current limiting resistor. The 4.7K resistor value provides appropriate current limiting for a 2.2V LED from VFAN supply.Cathode correctly connected to MOSFET drain Q12A pin 7 for switching control.
The cathode pin connects to NetC154_2, which also connects to Q12A pin 7 (drain), C154 pin 2, J29 pin 1, and test point TP8. This configuration allows the LED to be controlled by switching the MOSFET Q12A. When Q12A is turned on, its drain-source resistance drops low, effectively connecting the LED cathode to ground through the MOSFET, completing the circuit and illuminating the LED. According to the datasheet (page 4-5), pin 1 is the Cathode for 0402 package LEDs. This is a standard LED switching configuration.LED2 - 5988110107F ✅
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📄 DRCY referred to this Datasheet for this component.
Anode correctly connected to current limiting resistor R12 which connects to VFAN supply.
The anode pin connects to NetLED2_A, which connects to R12 pin 1. R12 pin 2 connects to VFAN supply. This forms a proper current limiting circuit for the LED. According to the datasheet (page 4-5), pin 2 is the Anode for 0402 package LEDs, and it should connect to positive voltage through a current limiting resistor. The 4.7K resistor value provides appropriate current limiting for a 2.2V LED from VFAN supply.Cathode correctly connected to MOSFET drain Q12B pin 5 for switching control.
The cathode pin connects to NetC153_2, which also connects to Q12B pin 5 (drain), C153 pin 2, J22 pin 1, and test point TP2. This configuration allows the LED to be controlled by switching the MOSFET Q12B. When Q12B is turned on, its drain-source resistance drops low, effectively connecting the LED cathode to ground through the MOSFET, completing the circuit and illuminating the LED. According to the datasheet (page 4-5), pin 1 is the Cathode for 0402 package LEDs. This is a standard LED switching configuration.LED3 - 5988110107F ✅
DRCY found no issues in this component 🎉
📄 DRCY referred to this Datasheet for this component.
Anode correctly connected to current limiting resistor R15 which connects to VFAN supply.
The anode pin connects to NetLED3_A, which connects to R15 pin 1. R15 pin 2 connects to VFAN supply. This forms a proper current limiting circuit for the LED. According to the datasheet (page 4-5), pin 2 is the Anode for 0402 package LEDs, and it should connect to positive voltage through a current limiting resistor. The 4.7K resistor value provides appropriate current limiting for a 2.2V LED from VFAN supply.Cathode correctly connected to MOSFET drain Q13A pin 7 for switching control.
The cathode pin connects to NetC211_2, which also connects to Q13A pin 7 (drain), C211 pin 2, J31 pin 1, and test point TP18. This configuration allows the LED to be controlled by switching the MOSFET Q13A. When Q13A is turned on, its drain-source resistance drops low, effectively connecting the LED cathode to ground through the MOSFET, completing the circuit and illuminating the LED. According to the datasheet (page 4-5), pin 1 is the Cathode for 0402 package LEDs. This is a standard LED switching configuration.LED4 - 5988110107F ❌
DRCY flagged 1 potential issues in this component.
📄 DRCY referred to this Datasheet for this component.
Cathode incorrectly connected directly to VFAN supply, preventing the LED from ever turning on.
Anode correctly connected to current limiting resistor R14 which connects to VFAN supply.
The anode pin connects to NetLED4_A, which connects to R14 pin 1. R14 pin 2 connects to VFAN supply. This forms a proper current limiting circuit for the LED. According to the datasheet (page 4-5), pin 2 is the Anode for 0402 package LEDs, and it should connect to positive voltage through a current limiting resistor. The 4.7K resistor value provides appropriate current limiting for a 2.2V LED from VFAN supply.Note: DRCY uses AI. Please verify the outputs.
Component
Q13B, pin5: Drain pin incorrectly connected to VFAN power supply, which would create a short circuit when the MOSFET turns on.Pin 5 (D) is connected directly to the VFAN net, which is the positive power supply for the fans. This is incorrect for a low-side MOSFET driver. When Q13B turns on, it would create a direct short circuit from VFAN to ground through the MOSFET's drain-source path. Additionally, LED4 cathode is also connected to VFAN while its anode connects through R14 to VFAN, meaning LED4 cannot function as both terminals are at the same potential. The drain should instead be connected to the load that needs to be switched (likely LED4 cathode), allowing the MOSFET to control current flow by switching the load's negative terminal to ground. The correct connection would be to connect Q13B drain to LED4 cathode and disconnect LED4 cathode from VFAN.
Component
D53, pinA: Anode incorrectly left unconnected, should be connected to GND for proper lower voltage clamping of TACH_2 signal.The anode is connected to 'unconnected-(NetD53_A)', indicating it is not connected to any net. According to the datasheet (page 1), pin 1 is the anode (positive terminal). For proper lower voltage clamping function, this pin should be connected to GND to match the topology used in the other three tachometer channels (D52, D56, D57). Without the anode connected to ground, D53 cannot provide lower voltage clamping protection for the TACH_2 signal, leaving it vulnerable to negative voltage transients that could damage downstream circuitry. The anode should be connected to GND to complete the lower clamp circuit.
Component
D53, pinK: Cathode correctly connected to NetD51_A signal node, but circuit is incomplete due to unconnected anode.The cathode is connected to NetD51_A, which is the signal node for the TACH_2 conditioning circuit. According to the datasheet (page 1), pin 2 is the cathode (negative terminal). While this connection is topologically correct for a lower clamp diode, the circuit is non-functional because the anode (pin A) is unconnected. For the lower clamp to work, current must be able to flow from the signal node through the diode to ground when the signal goes negative. The cathode connection is correct but the overall circuit is incomplete.
Component
J30, pins1, 2: Both pins 1 and 2 are connected to VFAN, providing no ground reference for the fan. This prevents proper fan operation as there is no return current path.Both pin 1 and pin 2 connect to the VFAN net, which means both pins provide the same positive supply voltage to the fan. Standard fan operation requires a power supply pin and a ground return path. Without a ground connection, the fan cannot complete its electrical circuit and will not operate. This appears to be a design error. Pin 1 should either be connected to ground (for a standard fan) or to a switched ground through a MOSFET (like the other fan connectors J22, J29, and J31). The lack of any ground reference makes this connector non-functional for fan operation.
Component
LED4, pinC: Cathode incorrectly connected directly to VFAN supply, preventing the LED from ever turning on.The cathode pin connects directly to the VFAN net. This creates a circuit where both the anode and cathode are at the same potential (VFAN), since the anode connects to VFAN through R14. With no voltage difference across the LED, no current will flow and the LED will never illuminate. According to the datasheet (page 4-5), pin 1 is the Cathode for 0402 package LEDs. Comparing to the other LEDs (LED1, LED2, LED3), their cathodes are properly connected to MOSFET drains for switching control. LED4's cathode should be connected to a switching element (likely another MOSFET drain) rather than directly to VFAN to allow proper LED operation.
Component
U11A, pins29, 30: PB29 and PB30 pins have swapped TDI and TDO connections, preventing proper JTAG functionality.Pin 29 is PB29/TDI according to the datasheet (page 8-12) but connects to net TDO/SWO, while Pin 30 is PB30/TDO/TRACESWO and connects to net TDI. This is incorrect - TDI (Test Data In) should connect to the TDI signal, and TDO (Test Data Out) should connect to the TDO/SWO signal. The datasheet clearly shows PB29 as TDI and PB30 as TDO/TRACESWO. This swap would prevent proper JTAG debugging functionality. The connections should be: Pin 29 (PB29) to TDI signal, and Pin 30 (PB30) to TDO/SWO signal.
Component
J18, pins7, 8: DAT1 and DAT0 data lines are swapped - pin 7 should connect to DAT0 but connects to MCDA0, while pin 8 should connect to DAT1 but connects to MCDA1.According to the SD card specification, pin 7 should be DAT0 and pin 8 should be DAT1. However, in this schematic: Pin 7 (labeled DAT1) connects to net MCDA0 which routes to microcontroller U11A pin 107 (PA21/MCDA0/PWML0), and Pin 8 (labeled DAT0) connects to net MCDA1 which routes to microcontroller U11A pin 81 (PA22/MCDA1/TCLK3/AD4). The microcontroller pin names indicate MCDA0 should connect to DAT0 and MCDA1 should connect to DAT1, but the schematic has them reversed. This swap would cause data communication errors with SD cards. The correct connections should be: Pin 7 (DAT0) -> MCDA0, Pin 8 (DAT1) -> MCDA1. Both connections have appropriate 10K pullup resistors and ESD protection, but the pin assignments are incorrect.
📄 DRCY referred to this Datasheet for this component.
Component
D21, pinsA, K: TVS diode has anode connected to VMOTE and cathode to GND, which is reverse orientation compared to other TVS diodes. This connection appears incorrect and should likely be reversed.D21 has its anode connected to VMOTE and cathode connected to GND, which is the opposite orientation from the other three TVS diodes (D22, D43, D78) that all have anode to GND and cathode to their respective power rails. For a unidirectional TVS diode like SMAJ24A protecting a positive voltage rail, the standard configuration is anode to ground and cathode to the rail being protected. D21's current configuration would provide protection against negative voltages on VMOTE rather than positive overvoltages. Given that VMOTE appears to be another motor power rail (similar to VMOTA which uses standard protection with D43), there is no apparent reason why it would require different protection polarity. The inconsistency with the other three identical TVS diodes strongly suggests this is a connection error. The diode should likely be reversed to match the standard protection configuration: anode to GND, cathode to VMOTE.
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