nrF 52832 Coin Cell Battery Monitoring Circuit

[Zachary16]

Hi all,

Currently working on a project using the nRF52DK and nRF52832 that will be powered by a CR2032 coin cell battery.

I want to measure the battery level from the coin cell battery using the ADC.

I have read up this thread in the nordic devZone https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf52

however my project supervisor did not like the idea of using voltage divider to measure the battery voltage as in the long run, the voltage divider will drain the battery. 

my question would be, is there another method for me to measure the battery level from the coin cell battery?

thanks!

[Vidar Berg]

Hi,

The blog post you linked to is about how you can measure the voltage for batteries that have peak voltage above 3.9 V (see Absolute maximum ratings). As the coin cell only has a nominal voltage of 3 volts you can use it to supply the chip directly.

I uploaded a demo sample in this post showing how one can sample the supply voltage on VDD (i.e. battery voltage if you don't have an additional regulator between your battery and chip): https://devzone.nordicsemi.com/f/nordic-q-a/71940/low-power-mode-using-saadc-with-ble_app_beacon

Best regards,

Vidar

[Zachary16]

HI Vidar,

Appreciate your reply! 

I'll read up on the demo sample that you have uploaded, if there any questions i would rise it up on your post.

thank you so much for your time! Have a good week ahead!

regards,

Zachary