ESP32-S3-WROOM-2 | PSRAM GPIOs Confusion

[bsikar]

I'm working on integrating the ESP32-S3-WROOM-2 into my design, but I am confused. Reading the datasheet, I see that some pins, such as IO9-IO14, are used internally. However, the development kits I see for sale have these pins exposed. Should I use these pins? I thought they weren't supposed to be used since they are for the internal PSRAM.

Can I use pins IO9-IO14 on the ESP32-S3-WROOM-2-N32R16V, or are they reserved for PSRAM and shouldn't be used as GPIOs? This is my understanding from the datasheet, but seeing development kits with these pins exposed makes me very confused about whether it's safe to use them as GPIOs.

[ahsrabrifat]

IO9–IO14 (GPIO9–GPIO14) are not the PSRAM/flash pins on the S3 module and are generally available as GPIOs.
The pins that are actually used for in-package PSRAM/flash are the higher GPIO numbers (GPIO33–GPIO42 and related SPI signals), so those are the ones you must treat as reserved/“do not use” if your module has on-package PSRAM/flash. https://www.espressif.com/sites/default ... eet_en.pdf

[bsikar]

I see, thank you so much.