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nRF6707 Incorrect current measurement

Hello,

I'm trying to make some current measurement using the nRF6707 and a nRF5 SDK Board(10040) (Board out of the box, shunts untouched). 

We're facing problems measuring the current consumption. Indeed, the current consumption is negative and centered around 31µA (See attached screenshots showing the phase when DUT is set to ON). Playing around with the switching points or the voltage regulator didn't changed anything.

Setup:

-My firmware (iBeacon sample code) is running OK regarding to the blinking LED on the nRF5 SDK board

-All 3 switches of the nRF6707 are set on "DK"

-Obviously the nRF6707 is stacked on the nRF5 SDK board

-The nRF5 SDK board is powered by the micro USB cable (power switch ON)

-The J-Link is connected on Debug in of the PPK (flashed with ppk_110.hex)

-The power profiler App starts correctly 

What did we do wrong ?

Thanks in advance,

Florian

Parents Reply
  • Hi,

    I suspect it might be that you have logging on. Can you check if NRF_LOG_ENABLED is enabled in sdk_config.h?

    "Charge" is current * time(µC = µA * s). So charge is basically total current over a given time. If you know the charge in for example, a BLE event, you can se 20use it to calculate the average current over different intervalls. Let's say that a BLE event use 20µC and an intervall 100ms, then we have:

    20µC / 100ms = 200µA average current over 100ms.

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