Has anyone had any experience using a PIC's internal A/D to monitor its own
battery supply?

My application will use one of the little PICs 12F675 or 16f676, but
information about others would be useful.

The part I'm having a hard time wrapping my noodle around is, what do I use
for a reference voltage?

This could be a high volume device, so cost is a concern. But I don't need a
high degree of precision, 4 or 5 bits would be fine. I just need an
approximation of battery health.

 Thanks
 Denny

--
http://www.piclist.com hint: To leave the PICList
mailto:piclist-unsubscribe-request@mitvma.mit.edu