ESP32-S3 RTC IO input current

[Baoshi]

In a low power design I'm putting esp32-s3 in deep sleep and use ext1 io to wake up.

Since the wakeup source is a rotary encoder without dent I can't assume it will stop at open position, so I'd prefer a large pull-up resistor to save power if the wiper stops at close position.

The ESP32-S3 datasheet said high-level input current is maximum 50nA. But I use 3.3V source and feed into IO pin through a 1MEG resistor I get 3.0V at the IO pin, meaning 0.3V across 1MEG resistor that works to be 300nA.

Is there a different input current w.r.t RTC IO?

TIA

[mgsecord62]

If your input impedance on the meter you are using to measure the 3 volts is 10 MEG that is what the current draw calculates to be (3.3/11Meg). 10 Meg is pretty typical input impedance for DMMs.

[Baoshi]

Thanks you're right. I need to manually set my DMM input impedance to 10Gohm to get correct result.