Simple way to move to power saving mode - NCS3.02/nRf52840

RE: Simple way to move to power saving mode - NCS3.02/nRf52840

Simonr — Fri, 22 Aug 2025 11:03:33 GMT

Can you export and upload the .ppk file here so we can review it on our end? The noise floor looks very high here, and maybe that will help us getting somewhere? A floor current of ~1mA and lots of noise there seems to point to something keeping it awake, quite possibly the shell/UART isn't going into idle mode, but I don't have any obvious suggestions as of now, as it will be pretty generic suggestions unless we can narrow it down. Maybe you can try disabling one and one peripheral and see which of them reduces the current.

Best regards,

Simon

RE: Simple way to move to power saving mode - NCS3.02/nRf52840

eyalasko — Wed, 20 Aug 2025 17:25:33 GMT

one more thing -

It seems as there's a missing dependency and CONFIG_PM is not activated (see squiggly line and pop up message)...

RE: Simple way to move to power saving mode - NCS3.02/nRf52840

eyalasko — Wed, 20 Aug 2025 17:12:21 GMT

Hello Simonr, thanks for your prompt reply

I followed your advice and managed to reduce consumption to ~2mA.
Using PPK2 I see a current spike every ~60msec. Nothing I can think of on the app side.
Can it be some idle/shell/logging thread waking up periodically?

RE: Simple way to move to power saving mode - NCS3.02/nRf52840

Simonr — Wed, 20 Aug 2025 12:21:56 GMT

For starters, can you confirm you've followed the https://docs.nordicsemi.com/bundle/ncs-3.0.2/page/nrf/test_and_optimize/optimizing/power_general.html guide in our documentation pages?

Additionally, as of NCS 3.1.0 we added a config for async device runtime power management with CONFIG_PM_DEVICE_RUNTIME_ASYNC which might be useful in your use case.

Best regards,

Simon