ESP32-S2 with 1.8 V IO

[jean.passepartout]

Hi,

I'm considering a design where it would be nice to have the GPIO working at 1.8 V on the ESP32-S2, is it possible? How? This isn't by far my first design with the ESP32 but it's something I never fully understood.

Thanks a lot,
Luís Rosado

[ESP_LJH]

There is a strapping pin GPIO45 to control VDD_SPI voltage, if GPIO45 is high at boot-up, VDD_SPI will be 1.8 V.

[jean.passepartout]

Hi thanks,

I knew about that feature to allow operation with 1.8 V flash IC. But what if I want the other pins, not the flash ones, to operate at 1.8 ? Is there any way to do so?

Cheers!

[ESP_LJH]

Sorry but only VDD_SPI supports 1.8 V mode, other power domains could not be down to 1.8 V.
You could use these GPIO33~GPIO37 after switching power domain to VDD_SPI via software.

S2 VDD_SPI pins.png (81.06 KiB) Viewed 5047 times

[statistical_banana]

"after switching power domain to VDD_SPI via software" - how exactly do you do that? I haven't found a single example anywhere online. Everyone only talks that it's possible, but nobody has ever posted a working example of it on the internet.