nrf52832 vdd 3.3v battery saadc measure

[vea45]

Hi,

I saw in the infocenter that the SAADC can measure the VDD directly. So in my case I want to check the voltage of a 3.3v coin cell regularly, I could do this without any external elements? I'm meaning without external resistances or capacitors...

Thank you!

[Wojtek]

If you are supplying power from that coincell directly, you don't even have to waste analog pin for that. Just set SAADC sorce as NRF_SAADC_INPUT_VDD and set the proper gain according to your reference...