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  • Case ID: 316014
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nRF52DK nRF52832 system off not working

zazas321

I am studying about nordic MCU's and learning about zephyr rtos in general.

I am especially interested in low power applications hence I am trying to put the nRF52DK into the lowest power consumption mode possible (system off).

I have built and flashed sample system_off project (zephyr/samples/boards/nrf/system_off). And I am running power consumption tests using Power Profiler Kit II.

I have ran the device for 60 seconds, and I can see that the average current consumption is 13.56mA:

 

I would like to understand what is the cause of this and how to put this development board into proper system off mode.  I am expecting the average current consumption to be a few uA only.

Additionally, I have noticed that the LED2 is barely lit even though I havent configured it. Why would that be the case? Do I need to manually put all the GPIOs to OFF state?

I have even tried to capture the logs and according to the logs it enters the sleep mode properly:

*** Booting Zephyr OS build v3.3.99-ncs1 ***

nrf52dk_nrf52832 system off demo
Retained data not supported
Busy-wait 2 s
Busy-wait 2 s with UART off
Sleep 2 s
Sleep 2 s with UART off
Entering system off; press BUTTON1 to restart

I have also tried to flash the "Hello world" sample project and the average current consumption is about 14mA so something is definately not right. The power consumption should be way lower, right?

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  • 0

    Hi

    The way you have connected the Power Profiler kit to the nRF52 DK here will power and show the current consumption of the entire DK instead of just the nRF52832 SoC on the board. If you connect the VOUT cable from the PPK to the topmost pin on pin header P22 and power the DK with a USB cable as normal you should be able to see the current consumption of just the nRF52832.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Could you please provide full information about measuring the SoC current consumption using your suggested method? Do I need to cut the SB9 if I want to measure this, as it is currently shorted? Additionally, do I use ampere or source mode  to measure current consumption using your suggested method?

    Additionally, Can you help me understand the following:

    1. What other circuitry draws so much current (apart from the SoC?) when I power the board using External Supply?Because still, 12mA seems like a lot and there is not that much going on on the board.

    2. Why does the LED2 stay barely lit? What kind of issue could that be?

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  • 0 in reply to Simonr

    Could you please provide full information about measuring the SoC current consumption using your suggested method? Do I need to cut the SB9 if I want to measure this, as it is currently shorted? Additionally, do I use ampere or source mode  to measure current consumption using your suggested method?

    Additionally, Can you help me understand the following:

    1. What other circuitry draws so much current (apart from the SoC?) when I power the board using External Supply?Because still, 12mA seems like a lot and there is not that much going on on the board.

    2. Why does the LED2 stay barely lit? What kind of issue could that be?

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