ncs3.1.1 peripheral_uart sample could see the current spikes while in low power state between two advertising current curve

[OPQ]

Hi,

in ncs3.1.1 peripheral_uart sample after disable the uart init and gpio_config, the nrf54l05 can achieve the low power state,but the avg Idle current was about 5uA,seens little bit higher than nrf52.

Than I double check the power cumsumption curve, I could see the current spikes while in low power state between two advertising current curve as below:

The advertise interval was 300ms,the abnormal spike interval was about 130ms(seens not a fixed value), and I check and sure that these abnormal spikes were not the RC clock's calculate event. I can found the  RC clock's calculate event interval was 8sec at other where.

[Stian Røed Hafskjold]

Hi, I wonder if you are using a revision 1 chip? Can you please read out the build code written on the chip (QFAAB0 or QFAAC0), and also the DK version if you are testing on a DK? Thanks

Chip revisions:
https://docs.nordicsemi.com/bundle/comp_matrix_nrf54l15/page/COMP/nrf54l15/nrf54l15_ic_revision_overview.html 

The reason I ask is because these spikes really look like errata-31 (even though the errata description maybe doesn't fit) which have been fixed on revision 2. You can try to apply the workaround for errata 31 manually to main(), but please make sure to remove the workaround if you are using revision 2. 

Please try this out and let me know

BTW, I ran your firmware here on a revision 2 chip, and I cannot see the same spikes. That is why I'm wondering if your chip might be rev 1.

I'm running on a DK, supplying 3V on VDD