Soft power ON with nRF51822

[Herve]

I am currently designing a board using the nRF51822 chip and I would like to implement a soft power ON circuit using the low power comparator (LPCOMP).

I understand that the LPCOMP uses the analog input AIN0 to 7 as input, but I would like to know what pin is used as the LPCOMP output in the default nRF51822 config (out of factory).

Best,

[Janek Mann]

It won't be connected to any output pin out of factory (and neither is the input pin). You can to hook up the UP, DOWN, or CROSS event to an output pin using the PPI & GPIOTE peripherals in order to generate a result on a pin.