Low power mode running MyNewt on nrf52832 DK

Hi,

    I'm working on putting our system into low power idle mode. We use MyNewt to build our application. In order to get to the lowest power, I disabled BLE and all our drivers except UART for console and debug messages. We have a command that can shut off a bunch of stuff and call __WFE and __SEV(). The code is tested on a nrf52DK(PCA10040 1.2.4, 2018.23). I checked the current on P22 on the board and the measurement was 270uA @ 3.8V from external power supply. This is far away from what your data sheet described. I have checked the setting everywhere and can not figure out what else I need to turn off. Can you please provide some suggestion where I should check? 

Thank you,

Min-Ching

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