piclist 2000\11\30\132008a >
Thread: Low Battery Sensing
face BY : Dan Michaels email (remove spam text)

BillW wrote:
>I wanted to sense battery voltage, in a circuit run directly from the
>battery, by ...
>1) use IO pin(s) to run voltage doubler
>2) voltage doubler goes to zener on Vref
>This would let a pic running from (say) a Li-Ion batter (3 to 4.1V useful
>range, I'd guess) sense the battery voltage on an absolute basis, at the
>equivilent of very low dropout voltages...
>Does that sound reasonable?

Hi BillW, forget the voltage doubler, just use a 2.5v ref diode
run straight off the I/O pin.

- danM

http://www.piclist.com hint: The PICList is archived three different
ways.  See http://www.piclist.com/#archives for details.


See also: www.piclist.com/techref/power/batterys.htm?key=battery
Reply You must be a member of the piclist mailing list (not only a www.piclist.com member) to post to the piclist. This form requires JavaScript and a browser/email client that can handle form mailto: posts.
Subject (change) Low Battery Sensing

month overview.

new search...