Slightly excessive current consumption after programming with J-Link

[CurtisHx]

I have the nRF52 dev board and a stand-alone Segger J-Link (not the one that's on the dev board) connected to the nRF52 through the Debug In header.

The firmware that gets downloaded puts the nRF52 into low-power sleep. All peripherals disabled with the RTC going. Interrupt is set to fire after 0x10000000 RTC ticks (a long time).

After programming and power cycling the board, I read 1.74uA average on a Tektronix 4050 DMM, which is expected. I'm powering the board with a bench supply set to 3.1v

However, if I just program the nRF52 without power cycling, the average current bumps up to 2.25uA.

Is this expected behavior?

[Stian Røed Hafskjold]

You should always power cycle the board after programming. In debug mode it consumes in the mA range, so I'm not really sure what the extra 0.5uA are. It could be some leakage current going through the SWD lines. Try to disconnect the debugger to see if the current drops back down.

[CurtisHx]

Debugger attached / detached doesn't make a difference. It takes a power cycle to drop the current consumption down 0.5uA