Any available Timer running in System OFF mode

[beemavishnu]

Hello,

 

I want to check how much time device is in Deep sleep. For this, is there any timer running in System OFF mode.

 

Thanks & Regards

Vishnu Beema

[cbd]

Which processor are you referring to?

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

[beemavishnu]

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.

[cbd]

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.

[Stian Røed Hafskjold]

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

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

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

[beemavishnu]

Thank you all for your inputs.