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Measure current of nRF52840-DK with a connected secure element via I2C

Hi,

I use the nRF52840-DK together with a secure element (Infineon Trust X) and want to measure current/powerconsumption of this whole setup during certain operations.

At the moment my setup looks like this:

  • OPTIGA Trust X connected to the nRF52840-DK via Arduino-Pin headers
  • Poweranalyzer connectet to P21
  • SW9 -> VDD
  • SW6 -> nRF only
  • J2 not plugged in

But I am not sure about SW10 if I want to use Arduino-headers for powering and communication with the Trust X.
Can someone give me some input on this on how to setup up those switches correctly for this measurement?

With best regards,
Marc

Parents Reply
  • Yes, the USB cable has to be plugged in to power the VDD domain on the DK, this includes the debugger MCU, the IC switches, etc. If they are not powered they will be floating and you get unpredictable behavior, and you will get leakage through the SWD pins.

    I tried a Zephyr example now, just putting the k_sleep(1000) in the main loop, and not initializing anything more and I get a current draw of 3 uA on the external supply header. With the same setup as I described below. Without the SE.

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