Power management nrf9160

[shahab_]

Hello,

I am trying to achieve a few uA current in nrf9160 but with even all conf off and empty while loop or even without the while loop the controller is consuming 5mA which is too much. The CONFIG_PM does not work in nrf-sdk 2.5.0 and as I am currently for testing not using any device so the CONFIG_PM_DEVICE is also of no use.
What exactly do I need to do to put the nrf9160 in SYSTEM_ON (sleep) mode so it takes around 5uA.
This is a custom board and I am using the power profiler. I have tried different cables , power profilers and boards, the results are same.
I have tried even all configs specifically =n. the pm_state_force and other pm function are also not working.
I am using norfic zephyr fork 3.6.99 ncs1 rc2 and also tried 3.4.99-ncs1-2, zephyr sdk 0.16.8.

[Vidar Berg]

Hello,

An empty while loop will prevent the CPU from entering idle. Have you tried adding k_msleep() to this loop instead (e.g. k_msleep(1000))? This will allow the program to enter the idle thread where the chip will enter System ON (sleep) mode. Please also make sure that CONFIG_SERIAL is set to '=n' in your project configuration so that the UART driver is disabled.

- Power optimization

PM device is only needed if you need to power down peripherals at runtime.

Best regards,

Vidar

[shahab_]

Yes I tried k_msleep as well it did not worked but thank you for the suggestion, the problem is solved.  NRF9160DK & System OFF
this thread solved the issue.

[Vidar Berg]

Thanks for the update. However, please note that the chip is powered down in System OFF mode. If you need the chip to continue to operate and wake-up on application interrupts, you need to use System ON mode.

https://docs.nordicsemi.com/bundle/ps_nrf9151/page/chapters/pmu/doc/operationmodes/frontpage.html 

[shahab_]

Thanks for the information, I will also look into it.