High power consumption after ADC read with 3.1.0 SDK

[Chris G]

We are seeing our nrf54l15 based device remain in a high power mode after an ADC read using the latest v3.1 SDK (tested on both rc1 and rc2). This did not occur with the v3.0.x SDK as the device correctly went back into a low power state. 

From my testing, after the adc_read() call, the device stays in a higher power state (~1.3mA). I don't see any failures or other issues and the ADC reading seems to work correctly. I can repro this with the ADC_DT sample when switching between the 3.0 and 3.1 SDKs. 

Is this a known issue or this there any config or other changes needed to use the ADC with the newer 3.1 SDK? 

Thanks,

Chris

[Edvin]

Hello Chris,

Is it possible for you to upload the application where you see this behavior? 

Best regards,

Edvin

[Chris G]

Hi Edvin,

It's the ADC_DT sample that that's part of Zephyr built as is. I can observe this on the nrf54l15dk where I see it 340uA (as measured with a PPK2 via VDDM header) when I compile and run the ADC_DT sample with v3.0.1 and then it jumps to ~1mA with the 3.1 SDK. 

adc_dt_sample.zip

Thanks,

Chris

[Chris G]

This appears to be resolved with the release version of the 3.1.0 SDK. I confirmed the power consumption returned to the expected value after perform the ADC read. 

[Edvin]

Hello,

Sorry that I didn't get back to you!

I tested your sample in NCS v3.1.0 the other day, and noticed it didn't have the increased current consumption, but I didn't get the chance to research why it behaved different in the release candidates. But I am glad that you found that it is working as expected again in the stable release of v3.1.0. 

Best regards,

Edvin