You've already forked Easyduino
mirror of
https://github.com/Hanqaqa/Easyduino.git
synced 2026-09-01 19:21:51 +00:00
84 lines
2.9 KiB
Markdown
84 lines
2.9 KiB
Markdown
# ESP32
|
|
|
|
The most popular WiFi Microcontroller
|
|
|
|
<p align="center">
|
|
<img src="https://github.com/Hanqaqa/Easyduino/blob/master/ESP32/ProductionFiles/Photos/Easyduino%20ESP32%20Iso.jpg" width="60%">
|
|
</p>
|
|
|
|
## Schematic
|
|
|
|
<p align="center">
|
|
<img src="https://github.com/Hanqaqa/Easyduino/blob/master/ESP32/ProductionFiles/PDFs/Schematic_Page_1.png" width="60%">
|
|
</p>
|
|
|
|
KiCad Schematic symbols, footprints and 3D Models were obtained from their [KiCad Github repository](https://github.com/espressif/kicad-libraries)
|
|
|
|
## Gerbers
|
|
|
|
<p align="center">
|
|
<img src="https://github.com/Hanqaqa/Easyduino/blob/master/ESP32/ProductionFiles/PDFs/Gerbers.png" width="60%">
|
|
</p>
|
|
|
|
## Specs
|
|
|
|
- Input Voltage: 5V-15V(External Source 5V Pin) 5V (USB) or 3.3V (3.3V Pin). ONLY USE ONE VOLTAGE INPUT AT A TIME
|
|
- Output Current at 3.3V : 1 A (External Source) 500mA (USB)
|
|
- No Polarity Protection (External Source)
|
|
- Overcurrent Protection: None
|
|
|
|
## References
|
|
|
|
### ESP32 WROOM 32E
|
|
|
|
#### Decoupling capacitors
|
|
|
|
- ESP32 Wroom 32 E datasheet p24 -> 3.3V pin needs one 22uF and one 100nF capacitors
|
|
|
|
#### Enable pin (EN)
|
|
|
|
- ESP32 Devkit sch -> EN pin 10k resistor and 100nF capacitor
|
|
|
|
#### Thermal Pad
|
|
|
|
- ESP32 Wroom 32 E datasheet p26 -> GND Thermal needs vias between pads. Needed vias are too small for my manufacturer. I will use bigger vias
|
|
|
|
#### Automatic Bootloader
|
|
|
|
- ESP32 Devkit sch -> Automatic Bootloader.
|
|
|
|
### USB-C
|
|
|
|
#### Filtering
|
|
|
|
- USB Hardware Design Guidelines for FTDI ICs p8 -> 10nF Cap + Ferrite Bead + 100nF Cap + 4.7uF Cap
|
|
- I disregarded such heavy filtering for the easier to implement 1uF and 100nF cap given in the CP2102 datasheet
|
|
- I added a polyfuse with Ihold=500mA and Itrip=1A.
|
|
|
|
#### Differential Pair
|
|
|
|
- USB needs 90 Ohm differential traces.
|
|
- According to JLCPCB impedance calculator, with a JLC7628 prepreg and 6mil (0.15mm) space between lines
|
|
- I have to use 9 mil tracks -> 0.2 mm
|
|
- I will use a very short trace for D+ D- (around 2mm)
|
|
- I have to place vias because of the pinout of USB C and CP2102. Some other people have done it with no problems
|
|
|
|
#### CP2102
|
|
|
|
- CP2102 datasheet p15 -> VBUS will be tied to REGIN. 1uF and 100 nF will be added.
|
|
- CP2102 datasheet p15 -> ESD Supression Diode for all three inputs of USB
|
|
- CP2102 datasheet p15 and p19 -> 100nF for VDD output, 4.7 uF is optional for higher current circuits.
|
|
- CP2102 datasheet p23 -> The VDD or 3.3 output can only provide 100mA. I will not use this as a voltage provider for the ciruit. I will use the AMS1117-3.3
|
|
- CP2102 datasheet p15 -> RST pulled up via 4.7k and SUSPEND~ pulled down via 10k.
|
|
|
|
#### AMS1117-3.3V
|
|
|
|
- AMS1117 Datasheet p1 -> 3.3V/1A Output with 5-15V Input
|
|
- AMS1117 Datasheet p4 -> 22uF tantalum capacitor on input and output.
|
|
|
|
## KiCad Render
|
|
|
|
<p align="center">
|
|
<img src="https://github.com/Hanqaqa/Easyduino/blob/master/ESP32/ProductionFiles/Photos/Easyduino%20ESP32%20Render%20Iso.jpg" width="60%">
|
|
</p>
|