ESP32 Forum

Hi,

I am trying to findout internal flash module voltage for my esp32 chip:

esptool.py --chip esp32 --port /dev/cu.usbserial-0001 chip_id
esptool.py v4.8.dev5
Serial port /dev/cu.usbserial-0001
Connecting...
Chip is ESP32-D0WD-V3 (revision v3.1)
Features: WiFi, BT, Dual Core, 240MHz, VRef calibration in efuse, Coding Scheme None
Crystal is 40MHz
MAC: fc:b4:67:ce:03:5c
Stub is already running. No upload is necessary.
WARNING: Failed to communicate with the flash chip, read/write operations will fail. Try checking the chip connections or removing any other hardware connected to IOs.
Warning: ESP32 has no Chip ID. Reading MAC instead.
MAC: fc:b4:67:ce:03:5c
Hard resetting via RTS pin...


As you can see, flash is not available anymore (it was working for two months), my current board is setting 3.3V (pin 12 low on boot). I am afraid that flash was burned due to high voltage...

I have tried to get info regarding correct internal voltage using latest version of datasheet, but there is no info there. https://www.espressif.com/sites/default ... eet_en.pdf


Where can I get this info ?

Thanks,

Chip is ESP32-D0WD-V3 (revision v3.1)

That chip does not have internal flash. Are you looking for the flash internal to the *module* rather than the chip?

You are right, we are using ESP32-WROVER-E-N16R8 module. Link to datasheet was link to this module.

We still cannot find proper/expected voltage for flash inside.

You are correct, I think that information accidentally was dropped from the datasheet because all those modules use the same voltage. I'll poke the docs team to fix that. For reference, from what I know all those modules run the flash/psram on 3.3V so putting zero volt on GPIO12 should not have damaged anything.

Great, if you can just confirm that 3.3 is expected voltage for ESP32-WROVER-E-N16R8 so I can close internal case. We will then assume that flash damage was from external cause or just bad module and continue with production of new devices.

Thank you for help/support!