0
mirror of https://github.com/Hanqaqa/Easyduino.git synced 2026-08-29 02:26:31 +00:00
Files
Easyduino/ESP32S3
..
2026-04-13 10:40:09 +02:00
2026-05-27 20:07:24 +02:00
2026-05-27 20:07:24 +02:00
2026-05-27 20:07:24 +02:00
2026-05-27 20:07:24 +02:00
2026-04-13 10:40:09 +02:00
2026-04-13 10:40:09 +02:00
2026-04-21 20:44:26 +02:00
2026-04-13 10:40:09 +02:00

ESP32S3

The new and powerful microcontroller from Espressif

Schematic

KiCad Schematic symbols, footprints and 3D Models were obtained from their KiCad Github repository

Gerbers

Specs

  • Input Voltage: 5V-15V(External Source 5V) 5V (USB UART OR USB ESP32) or 3.3V. 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 S3 WROOM 1

Decoupling Capacitors:

  • ESP32 S3 WROOM 1 datasheet p25 -> 3.3V pin needs a 22uF and a 100nF capacitors. The 22uF doesn't have to be a tantalum capacitor. But I will use a tantalum to reuse components

Automatic Bootloader

  • ESPS3 Sch -> Automatic Bootloader.
  • ESPS3 Sch / ESP32 S3 WROOM 1 datasheet p25 -> EN pin 10k resistor and 100nF capacitor

Thermal vias

  • ESP32 S3 WROOM 1 datasheet p27 -> GND Thermal needs vias between pads

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.
  • Using JLCPCB's JLC04161H-7628 stackup.
  • Which with Signal Layer (Layer 1) and a GND layer (L2) below. And with 0.2mm tracks and separated 0.15mm gives a differential pair impedance of approximately 90 Ohms.
  • For USB1 will use a very short trace for D+ D- (around 2mm)
  • For USB2 (tracks that go to the internal ESP32 S3 pins and the pinout) the traces are long ~60mm for D+ D-, and have vias
  • The Development board from ESP32S3 has no problem with these differential pairs with vias and is a 2 board layer
  • I also have to place vias because of the pinout of USB C and CP2102. Some other people have placed vias without problems for signal integrity

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