I/O in deep sleep mode

LPWAN Modules / EVBs RAK3172
1

Dear forum,

I am curious about some details regarding entering sleep mode via RUI3 arduino code.

What happens to the I/Os when the RAK3172 module enters deep sleep?
Are pull-ups/downs still active?
Do outputs set to high still keep the high state? Is sink/source capability changing?

Should unused inputs be configured as outputs and set to low before entering deep sleep?

Thanks for the input and best regards
Thorsten

2

Answers below are for RUI3, if you are using STM32CubeIDE, I don’t know.

I/O’s will keep their state when the RAK3172 goes into sleep.

No need to configure unused I?O’s, just keep them uninitialized.