On a system using an NRF52832 with S132 softdevice (without no external LFCLK XTAL), in low power mode via sd_app_evt_wait()
- we see a nominal current of ~3uA with a periodic current blip of ~100 uA.
There are a few other peripherals on the board - but we believe the blip is due to the NRF52832.
This blip occurs every ~4s.
The only NRF peripheral that can wake the system are GPIOTE events in low-accuracy mode (there are 3).
According to the datasheet - the 4s blip could be due to calibration of the LFCLK. Is the LFCLK required by the softdevice during sd_app_evt_wait()
? - or does the GPIOTE peripheral require LFCLK?