setting System ON sleep mode and wake up on RTC event

RE: setting System ON sleep mode and wake up on RTC event

Susheel Nuguru — Fri, 11 Feb 2022 13:09:18 GMT

Seems like something else is still on, do you have any peripheral like LPCOMP enabled which takes around 20uA current even in sleep?

RE: setting System ON sleep mode and wake up on RTC event

Sergio Bezz — Tue, 08 Feb 2022 11:42:32 GMT

Fine ! I removed the forever loop as you suggested and the system falls to idle sleep: the drawn current drops to 25 uA.

Nevertheless, this is 10 times the power target with System ON condition + RAM retention running from LFRC clock.

How may I improve this figure ?

regards

RE: setting System ON sleep mode and wake up on RTC event

Susheel Nuguru — Mon, 07 Feb 2022 18:49:50 GMT

You do not need to do anything to make the system go to sleep on nRf52 devices as described in this thread. The system goes to idle sleep automatically when all of your other threads are suspended or waiting for something.

If system _off is what you are seeking then i tried the example in<NCS_FOLDER>\v1.7.0\zephyr\samples\boards\nrf\system_off\src\main.c and it works ok on the nRF52840 DK board.