According to the datasheet and this post, for single ended input, the maximum voltage reference is AVDD which is internally generated to ~1.8V
My problem is that I want to measure the battery voltage, so how do I do this?
I was going to use the battery voltage as reference and an internal value as the input of the ADC, but since now I read that the reference isn't dependent of the battery, I'm not sure what to do.
I'm trying to see if the differential input can be done for this since it has a wider range, is this the way to go?