HOW TO MEASURE NEGATIVE VALUE USING ADC IN NRF52832?

[fenil.patel]

HI, 

     I am using nrf52832 dk. I have a sensor that gives a negative voltage. I want to measure the value using saadc. 

    and can I use differential mode saadc for negative voltage? 

 how can I do it please tell me if u know.

[awneil]

You mean a voltage below Vss ?

You can't do that directly - you'd need either a voltage translator of some sort, or to reference your sensor to something such that it's output does not drop below the nRF52832's Vss.

It is common (universal?) that microcontroller inputs cannot go below Vss, so the sensor manufacturer must have some across this case - have you looked on their website and/or contacted them for help ... ?

[haakonsh]

Also, can you share the datasheet for your sensor? 

[fenil.patel]

thank you for reply, now it's solved.

[awneil]

For the benefit of others who may have similar questions, and find this, please share your solution.

And verify the answer