RE: nrf52832 system off design issue

haakonsh — Thu, 13 Jun 2019 11:10:28 GMT

When in System OFF mode, the device can be woken up through one of the following signals:

The DETECT signal, optionally generated by the GPIO peripheral
The ANADETECT signal, optionally generated by the LPCOMP module
The SENSE signal, optionally generated by the NFC module to “wake-on-field”
A reset

I suggest you try the LPCOMP — Low power comparator peripheral instead of the GPIO peripheral as the wake-up source.

By using an external reference you can use a pull-up of much higher resistance:

You can probably use 10M or higher resistance pull-ups, you'll have to try it out.