Xiao ble sense power off

[msfujino]

Please also refer to the following link regarding current consumption of the battery voltage reading circuit.

XIAO nRF52840 Battery voltage reading circuit increases sleep current

The XIAO nRF52840 is equipped with a battery charging circuit and a battery voltage reading circuit. To read the battery voltage while charging or discharging, set P0.14 (VBAT_ENABLE) LOW to divide the voltage by about 1/3 and connect it to P0.31 (PIN_VBAT) on the ADC input. The voltage divider circuit consumes about 2.3 uA, so in applications where I want to minimize the sleep current, set P0.14 HIGH after reading the battery voltage to reduce the current. [SleepCurrent] SleepCurrent_VbatEna…