Any available Timer running in System OFF mode

RE: Any available Timer running in System OFF mode

beemavishnu — Tue, 11 Jun 2019 12:32:22 GMT

Thank you all for your inputs.

RE: Any available Timer running in System OFF mode

Stian Røed Hafskjold — Tue, 11 Jun 2019 11:29:18 GMT

No timers are running in system OFF mode. Everything is powered down and the chip can only be woken up by an external signal:

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

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=3_1_0_17_1#unique_1707892264

RE: Any available Timer running in System OFF mode

cbd — Mon, 10 Jun 2019 12:13:12 GMT

I don't think so.

The Timers use the external clock crystal and so that has to remain powered for it to function.

You could try the RTC as that uses the Low Frequency Clock and crystal, using less power, but again in system OFF mode it is disabled. It has a lower resolution than the Timers, so you have to handle that and overruns.

RE: Any available Timer running in System OFF mode

beemavishnu — Mon, 10 Jun 2019 09:10:18 GMT

I am using nRF52832, SDK_15.3.0, S132 SoftDevice.

Similar to RAM retention even in System OFF mode, is there any option where at-least one timer kept enabled.

Apart from Timer, is there any other option to measure the duration of deep sleep.

RE: Any available Timer running in System OFF mode

cbd — Mon, 10 Jun 2019 09:06:29 GMT

Which processor are you referring to?

As a general rule, if a processor is in it's lowest powered state internal timers are disabled.