nRF54L15 power consumption in sleep

[Marcel Graber]

Hi,

I've received the nRF54L15 DevKit and tested the power consumption during sleep
Testproject in GIT: https://github.com/marcel-cd/nrf54l15dk-powertest

The result was 960uA, the nRF52DK needed with the same settings 7uA. Are there any new settings or peripheral settings needed to get a proper sleep with the nRF54L?

[BrynMorgan]

I had this same issue. With Dev kits, their Devicetree is configured by default to enable most/all peripherals (ADC, GPIO, UART etc).

This is done within the ncs/zephyr/boards configuration .dtsi file by assigning status = "okay" to those peripherals.

What you want to do is create an overlay of the dev kit and disable those peripherals by assigning status = "disabled"

This should reduce your current consumption in sleep state.

Zephyr should automatically be putting the peripherals to sleep however needs additional sleep configuration in the devicetree/configuration files which the Dev kit files do not contain by default.

[Marcel Graber]

Hi Bryn, 

when you look at the project, you see that I already disabled UART and ADC in an overlay. ;-)

[BrynMorgan]

Sorry, I see that in the boards folder now. Are you certain it's actually applied to the build? In my build config I had to manually point it to the overlay file, it didn't seem to automatically detect it.

I achieved ~3-4uA sleep current by using the cpuapp build configuration. Perhaps try that?

Also I used the Board Configurator App to disable the UART/SWD/GPIO switches on the dev kit. According to the dev kit data sheet, leaving these active leaks current.

[Marcel Graber]

thanks for your tips, yes I also used the Board Configurator to set the switches. BTW, After I did turn off the SWD, I did not get the DK back to work ;-(

Which project in the NCS did you use for your tests?

[BrynMorgan]

I had the same issue with bricking the dev kit after disabling the SWD switches. I had to revert back to Board Configurator 0.3.7 to get it working again. See my post here:  nRF54L15-PDK cannot connect after attempt to change Board Configurator settings

I used a custom project, which is essentially just a BLE advertising beacon every 1s, sleeping in between.

Also, one other config option to enable in your prj.conf would be:

CONFIG_PM=y

I have this enabled in mine.

[Marcel Graber]

When I enable the CONFIG_PM, I get a configuration warning. Seems something with my Out of Tree build setup is not correct