ESP32 Forum

Hey, does anyone know what VDET1 (pin 10) and VDET2 (pin 11) do?
Their function is not in the datasheet and they are left floating on the ESP-WROOM-32

They are general RTC-domain inputs. You can use them as GPIO (well, they're input only, so GPI) or connect them to an ADC.

And what are general RTC domain inputs?

Well, they belong to the RTC power domain, which means that the devices that fall under the RTC can control them. It means e.g. that they can be used as ADC pins and that the ULP coprocessor can read them. Apart from that, they can also be used as normal GPIOs and when the CPU is on, they can be routed as inputs to most peripherals over the GPIO mux. They can't be outputs though, input only.

Please can you explain in more detail?

Does this mean that VDET_1 and VDET_2 can be used as ADC inputs or digital inputs by the ULP co-processor, but all the other RTC_GPIO can only be used as digital inputs by the ULP co-processor.

Thanks,
Will