Powering ESP32-S2 SMD Module Via GPIO 3.3V pins

[rohanrehman]

We have a smart city project here in Tokyo and went with the S2's SMD module.

successfully flashed the ESP32-S2 Module thanks to this tutorial https://www.14core.com/wiring-and-flash ... -uart/amp/.

I used this particular TTL module
https://www.alibaba.com/product-detail/ ... 92159.html

Using the EN pin to reset while D0 was grounded got me booted with the SMD module in "waiting to download" (ready to flash).

Running the basic wifi server script I get a BROWN OUT RST.....
I believe am not using the correct pins to actually power the ESP32-S2 module, reading the ESP32-S2 data sheet https://www.espressif.com/sites/default ... eet_en.pdf
It's a little confusing exactly what pins need to be connect to 3.3V.... GND + 3.3V seems not be enough.

I do have multiply 3.3v power that work well and power other devices to test... I hope this forum has reader with experience on powering the SMD module!


Looking forward to have this figured out as we are using these for a smart city project here in Tokyo.

[ESP_Minatel]

Hi,

This is due to the 3V3 power being provided by the FTDI IC and not by an external LDO or similar. I think the 3v3 pin from the FTDI only provides ~50mA. You need at least 500mA to be in a safe zone.

[rohanrehman]

I have used other external power supplies with issues.
Confirmation on the pins would be useful.

834E116B-0F15-4B2B-9635-14ED72EDB0C6.jpeg (506.37 KiB) Viewed 3117 times

[ESP_Minatel]

Hi,

The module datasheet shows you this information. See the Peripheral Schematics chapter of this datasheet.

[ESP_Minatel]

Any news?