I'm revisiting a design I made.
The circuit is powered by 24V with polarity protection.
I placed a power loss detection before the polarity protection:
In case the power pins were replaced, the 3v3 zener diode will have forward voltage of ~1V.
will this pin go through R32 to the "unpowered microcontroller" and destroy its IO pin?
The absolute maximum is -0.3V in the mcu:
It's only 100uA limited by R32, but I can't be sure.
Is there such detailed information about the IO pin?