nrf9160 rtc sleep

RE: nrf9160 rtc sleep

helsing — Tue, 24 Nov 2020 10:19:20 GMT

Hi Josh,

A colleague is currently working on a similar case where the goal is to save power while sleeping with RTC enabled. The first reply regarding setting CONFIG_SERIAL=n in prf.conf might be relevant. Let me know what your current consumption looks like with this config disabled.

By the way, are you working on some code which is modified from the aws_iot sample?

Best regards,

Håkon

RE: nrf9160 rtc sleep

helsing — Thu, 19 Nov 2020 15:24:40 GMT

Hi Josh,

It is likely that you need to disable the serial communication, using config. I will get back to you with more details.

In the mean time, here are some relevant links regarding power consumption.

Online power profiler for LTE:

https://devzone.nordicsemi.com/nordic/power/w/opp/3/online-power-profiler-for-lte

Upcoming webinar on how to measure power consumption on nRF9160:

https://webinars.nordicsemi.com/how-to-measure-power-consumption-on-1/join

Best regards,

Håkon

RE: nrf9160 rtc sleep

josh123 — Mon, 16 Nov 2020 00:59:14 GMT

Hi Håkon,

I have tried `k_sleep` function call and it seemed to reduce power consumption from 15mA running to 1mA but that's still much higher than the quoted 2.2uA in IMCUON1 (MCU on IDLE, modem off, RTC on). Are you able to find an example of RTC sleep and wake? On STM32 I would call `HAL_PWR_EnterSTANDBYMode` which puts it into very low current standby until the RTC goes off and wakes the system.

Thanks,

Josh

RE: nrf9160 rtc sleep

helsing — Mon, 09 Nov 2020 15:16:53 GMT

Hi Josh,

In stead of powering off completely, please try using k_sleep()at the end of each of your threads.

Documentation on threads(NCS v1.4.0): https://developer.nordicsemi.com/nRF_Connect_SDK/doc/latest/zephyr/reference/kernel/threads/index.html?highlight=k_sleep#c.k_sleep

Best regards,

Håkon

RE: nrf9160 rtc sleep

helsing — Mon, 09 Nov 2020 10:23:10 GMT

Hi Josh,

I will get back to you with a couple of examples shortly.

Best regards,

Håkon