Page 1 of 1
ESP32-S2 with 1.8 V IO
Posted: Tue Jul 06, 2021 12:32 pm
by 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
Re: ESP32-S2 with 1.8 V IO
Posted: Wed Jul 07, 2021 4:10 am
by 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.
Re: ESP32-S2 with 1.8 V IO
Posted: Wed Jul 07, 2021 6:35 am
by 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!
Re: ESP32-S2 with 1.8 V IO
Posted: Wed Jul 07, 2021 6:59 am
by 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 4747 times
Re: ESP32-S2 with 1.8 V IO
Posted: Thu Mar 16, 2023 2:54 pm
by 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.