I'm starting to think about a low consumption embedded application which will have a nominal 7.4V battery supply plus a 5V low quesicent regulator at an ATMega32xxxx.
If I want to measure the battery voltage can I feed the raw 7.4V into the ARef level? Is that allowed - ie. > Vdd? I couldn't see any specific min/max in the spec sheet.
The other option that I can think of is a dividing resistor and sense from there - but that is constant load which I would like to avoid.
Thanks in advance,
PS: Been a while since I posted here - the 'big project' is now flying - huge buzz.. http://www.youtube.com/zkvii :D