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nRF9151-DK not running from external power when USB is disconnected

Oleg-AgamControl

I’m using the nRF9151-DK Evaluation Board. Normally, I connect the board to PC via USB — for programming/debugging 

However, since I’m preparing for production testing, I need to check how the controller behaves without the USB cable connected.
So, I connected an external power supply to the board (instead of powering it from USB), and in the beginning everything functioned properly with this setup

But when I disconnect the USB cable, the controller stops working.

Question 1:
How can I configure the nRF9151-DK so that it keeps running from an external power supply only, without needing the USB cable connected?

During operation, I also connect external components via GPIO pins.

Question 2:
When the board is powered externally and the USB connection is not used, how are the GPIOs powered?
Do I need to supply VDD_GPIO separately in this case?

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  • 0

    Hi,

    How can I configure the nRF9151-DK so that it keeps running from an external power supply only, without needing the USB cable connected?

    You have to put 5V to the "VIN 5V" pin (P20 pin 9) and it should work. Here is the power supply documentation for the nrf9151dk.

    When the board is powered externally and the USB connection is not used, how are the GPIOs powered?
    Do I need to supply VDD_GPIO separately in this case?

    No, you don't need to power it separately. When you are powering the DK via the "VIN 5V" pin, it powers the whole DK (including the GPIOS). 

    Best regards,

    Simon D-M

  • 0 in reply to Simon D-M

    I understand your explanation, but this solution does not suit my needs.
    The issue is that I want to test the modem’s power consumption under conditions as close as possible to real-world operation.
    On the actual board, the supply voltage I will have is 3.5 V.
    This is exactly the voltage I am currently applying to the nRF’s VDD, and this is how I measure the real power consumption.
    On the actual board, there will be no 5 V supply, only the 3.5 V I am using now.

    Therefore, I return to my original question:
    How can I make the processor and GPIO run under these conditions without connecting USB and without using a 5 V supply (use only 3.5V supply)?

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  • 0 in reply to Simon D-M

    I understand your explanation, but this solution does not suit my needs.
    The issue is that I want to test the modem’s power consumption under conditions as close as possible to real-world operation.
    On the actual board, the supply voltage I will have is 3.5 V.
    This is exactly the voltage I am currently applying to the nRF’s VDD, and this is how I measure the real power consumption.
    On the actual board, there will be no 5 V supply, only the 3.5 V I am using now.

    Therefore, I return to my original question:
    How can I make the processor and GPIO run under these conditions without connecting USB and without using a 5 V supply (use only 3.5V supply)?

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