Coin cell powered thermometer (please help)

[lawalan]

Hello all,

I want to built a coin cell powered thermometer with NTC thermistor.

May I know if I need to regulate the voltage from the coin cell or i can power the nrf52832 and the thermistor directly by the coin cell to give accurate reading?

Many thanks!

[haakonsh]

Hey alan,

You can use VDD as a reference voltage to the SAADC, that way you do not need to regulate the voltage over the NTC voltage divider.

 

Cheers, 
Håkon