When the PPK is used with an nRF5 DK, it is recommended to use the Power select (SW4) switch in the DK position.
It is not recommended to use the PPK onboard regulator as the power source (the Power select switch (
SW4) in the
Reg. position) as this may lead to erroneous current readings.
Note: If you want to improve the USB noise filtering, you need to use the PPK onboard regulator as the power source. Make sure that the PPK regulator voltage exactly matches the nRF5 DK voltage. Otherwise, current leakage may occur and lead to erroneous current readings.