The Idle Current is Different Before and After a Debug Operation

[YFTbs]

Hello,

  I'm measuring the idle current using a PCA10040 DK, SDK v16.

  Finding that the idle current is about 3uA (which I think is correct)  after any debug operation like programming or RTT connection, but it is about 12uA when power on.

  A resetting from RESET button or NVIC_SystemReset() maintains the same current.

  Where does the current come from?

Wish you a nice day.

[YFTbs]

OK, it seems to be the Interface MCU that caused the current.

The debugger chip should be reset before measurement.