ESP32.md
ESP32 vs ESP32-S3

The ESP32 has a higher bandwidth ADC and PWM high-speed mode for "glitch free" transition, whatever this means.
see LED Control (LEDC) <![CDATA[]]>https://docs.espressif.com/projects/esp-idf/en/stable/esp32/api-referenc...<![CDATA[]]>




  

  
ESP32
  
ESP32-S3




  
ADC SPS
  
2M
  
83.3k


  
PWM high-speed mode
  
y
  
n


  
USB phy
  
n
  
y


  
heap RAM
  

  



  

  

  





<![CDATA[]]>https://github.com/UnexpectedMaker/esp32s3/blob/main/schematics/schemati...<![CDATA[]]>


Programming /flashing over USB


need BOOT button, as when chip is in panic boot loop, unable to put it in download mode over USB



Mounting the ESP32-S3 on a small break out enables easy replacement.
We can choose another chip with a different footprint.
MCU specific interfaces (USB etc) that do not belong to the board
can be moved to that break out.

KiCad SMD 2.54mm pin headers are ordinary 90deg THT headers with the odd pins
twisted. An SMD footprint of such headers can be placed inside the ESP32-S3-WROOM
footprint.
<![CDATA[]]>SMD 2.54mmpin header<![CDATA[]]>

Pin Considerations

check the <![CDATA[]]>ESP32-S3 datasheet<![CDATA[]]>


Vcc GND
EN not normally not needed. The MCU can sleep and wake-up. The EN is just needed for programming
Some pins have start up glitches (GPIO1-17 low, GPIO18-20 high!). don't use this for pwm signals


GPIO >= 21 for outputs

ADC1 channels are useful (ADC2 conflicts with WiFi)
SPI native pins?


Rust Dev Board Kicad <![CDATA[]]>https://github.com/esp-rs/esp-rust-board/tree/master/hardware/esp-rust-b...<![CDATA[]]>
Power Supply <![CDATA[]]>https://www.espressif.com/sites/default/files/documentation/esp32-s3_dat...<![CDATA[]]>




  

  
Int. Flash
  
PSRAM
  
Ambient Temp. Max




  
ESP32-S3-WROOM-1U-N4R2
  

  

  
85


  
ESP32-S3-WROOM-1U-H4
  

  

  
105


  
ESP32-S3-WROOM-1-H4
  

  

  
105




Flash and PSRAM


PSRAM resides in the ESP-S3 chip
Flash is inside the WROOM metal enclosure, connected to the ESP32 chip with SPI
Flash has 100k erase cycles




Antenna Connector


U.FL Series connector from Hirose
MHF I connector from I-PEX
AMC connector from Amphenol
<![CDATA[]]>https://www.digikey.pt/en/products/detail/seeed-technology-co-ltd/103990...<![CDATA[]]>





  
MPN
  
Type
  
Freq
  
Gain
  
cable
  
Px
  





  
Seeed XIAO ESP32C3
  
Rod
  
2.45GHz
  
2.81dBi
  

  
2€
  
<![CDATA[]]>digikey<![CDATA[]]>


  
Ezurio MAF94045
  
PCB
  
2.4GHz
  
2dBi
  
10cm
  
1.3€
  
<![CDATA[]]>digikey<![CDATA[]]>


  
Ezurio MAF95310
  
PCB
  
2.45GHz, 5GHz
  
2.8dBi, 3.4dBi
  
18cm
  
1€
  
<![CDATA[]]>digikey<![CDATA[]]>


  
Inventek W24P-U
  
PCB
  
2.4GHz
  
3.2dBi
  
9cm
  
1.3€
  
<![CDATA[]]>digikey<![CDATA[]]>


  
Inventek W2.4-5P-U
  
PCB
  
2.4GHz, 5Ghz
  
2.6dBi, 3.3dBi
  
9cm
  
1.5€
  
<![CDATA[]]>digikey<![CDATA[]]>


  
Fanstel ANT060
  
Rod
  
2.45GHz
  
6dBi
  
10cm
  
2.9€
  
<![CDATA[]]>digikey<![CDATA[]]>




Dev Boards

<![CDATA[]]>https://www.waveshare.com/esp32-s3-zero.htm<![CDATA[]]>
<![CDATA[]]>https://github.com/femtoduino/femu-hardware/tree/master/femu/kicad/femu<![CDATA[]]>
esp32-rust