Power consumption too high with zephyr

RE: Power consumption too high with zephyr

Aurele — Sun, 14 Sep 2025 12:36:41 GMT

You’re right, that 1 mA was due to the UART. I’m now disabling RX between each serial exchange.

RE: Power consumption too high with zephyr

Aurele — Sun, 14 Sep 2025 12:35:16 GMT

[quote userid="18935" url="~/f/nordic-q-a/124140/power-consumption-too-high-with-zephyr/547674"]

UART will keep the HFINT/HFCLK running, and that yields very roughly 1mA current consumtion.

Your old code had to disable the UART somehow.

[/quote]

"Indeed, that was the case! Thank you :)

RE: Power consumption too high with zephyr

Kazi Afroza Sultana — Thu, 04 Sep 2025 13:59:10 GMT

Hello Aurelien,

Do you need to keep the UART in your project?

If you need to do that, you have to call this pm_device_action_run (uart, PM_DEVICE_SUSPEND) when system is on idle. Also, in the pincntrl.dts file, you have to use low-power-enable. You can look at this previous case (Power consumption on UART, Current optimization).

RE: Power consumption too high with zephyr

Turbo J — Wed, 03 Sep 2025 14:08:37 GMT

UART will keep the HFINT/HFCLK running, and that yields very roughly 1mA current consumtion.

Your old code had to disable the UART somehow.