voltage nrf9160

[liuyanfeng]

How to calculate the voltage and battery percentage of nrf9160, such as 4.2V, 3.0V, 3.3V, etc

thank you very much!

[Håkon Alseth]

Hi,

 

The range of SAADC is up to 3.6V (0.6V ref, 1/6 gain), provided that VDD_IO is 3.3V.

The input range has to be within VDD_IO + 0.3V.

 

Since you have a voltage higher than VDD_IO, you have to use an external voltage divider (two resistors) to get it within VDD_IO+0.3V.

 

There's an older adc example here, but it might need some porting if you're on ncs v1.3.0:

https://github.com/Rallare/fw-nrfconnect-nrf/blob/nrf9160_samples/samples/nrf9160/adc/src/main.c

 

Kind regards,

Håkon