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  • Case ID: 336998
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NRF54L15-DK sleep current problem

secondbest

Hello Nordic team,

I bought newly announced NRF54L15-DK board. Its version is v0.9.1. I am using NCS v2.8.0. I tried to test sleep current via nrf52840-dk and nrf54l15-dk. When I compile my sleep_test project for nrf52840-dk, I am getting following result with 3V supply voltage.

The result seems okay to me for nrf52840-dk. However, if I use 3V supply voltage for nrf54l15-dk, I am getting following strange sleep average current.

After that, I tried to use 2.5V supply voltage with nrf54l15-dk and I got following idle current results. Strangely, I am seeing current spikes at every 4 seconds. 

I watched Nordic's demo on YouTube and I feel there is no this type of ticks on this demo. I wanna learn that how can I use 3V supply voltage and How can I solve this sleep issue?

Thanks. 

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    Hi

    How do these every 4 second spikes look if you zoom in on them, and what project are you using for testing here? Every 4 seconds is oddly familiar to the default clock calibration period that's used by default on the nRF54L15, and is required even when LFRC is not used.  This is already discussed in this case where my colleague Vidar discusses a similar issue with a DevZone user and has some suggestions to how to disable calibration.

    This is described in this erratum by the way. As long as you're working at room temperatures, it should be fine increasing the time between each calibration in your use case. This was not yet discovered when we did and uploaded the demo on Youtube, but you should see the same if you remove this calibration altogether.

    Best regards,

    Simon

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  • 0

    Hi

    How do these every 4 second spikes look if you zoom in on them, and what project are you using for testing here? Every 4 seconds is oddly familiar to the default clock calibration period that's used by default on the nRF54L15, and is required even when LFRC is not used.  This is already discussed in this case where my colleague Vidar discusses a similar issue with a DevZone user and has some suggestions to how to disable calibration.

    This is described in this erratum by the way. As long as you're working at room temperatures, it should be fine increasing the time between each calibration in your use case. This was not yet discovered when we did and uploaded the demo on Youtube, but you should see the same if you remove this calibration altogether.

    Best regards,

    Simon

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