Can we do adc reading from the external Li-Po 3.7V battery?

RE: Can we do adc reading from the external Li-Po 3.7V battery?

run_ar — Wed, 02 Sep 2020 10:31:02 GMT

Hi,

You need to use a voltage divider. e.g. https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/measuring-lithium-battery-voltage-with-nrf52

RE: Can we do adc reading from the external Li-Po 3.7V battery?

Jaehong Park — Wed, 02 Sep 2020 08:53:48 GMT

I found the absolute maximum ratings are as followings: https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.nrf52832.ps.v1.1%2Fabs_max_ratings.html&anchor=abs_max_ratings.

So, I think the the voltage of external 3.7V battery would be allowed via analog input because the voltage ranges from GND to VDD(maximum 3.9V).

I'd like to be confirmed from you about reading the adc reading directly from external battery.

RE: Can we do adc reading from the external Li-Po 3.7V battery?

run_ar — Wed, 02 Sep 2020 06:15:47 GMT

Hi,

Unfortunately you cannot do that. I.e. the product specification says: "The AIN0-AIN7 inputs cannot exceed VDD, or be lower than VSS". See Reference.