Does the circuit need to be pwered up all the time? I am currently working
on a circuit that uses a DS11305 RTC to wake up the power based on a
schedule. The RTC interrupt output turns on the power to the micro, which
does its thing and then shuts down the power until the next wake up event
occurs. We are expecting to get something like 10 years of operation out of
our Li batteries by doing this...

Douglas Wood
Software Engineer
dbwood@kc.rr.com

Home of the EPICIS Development System for the PIC and SX
http://epicis.piclist.com

> > -----Original Message-----
> > From: pic microcontroller discussion list
> > [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of John Waters
> > Sent: Sunday, July 22, 2001 12:18
> > To: PICLIST@MITVMA.MIT.EDU
> > Subject: [OT]: How to reduce power consumption for battery operated
> > circuits?
> >
> >
> > Hi All,
> >
> > For a battery operated circuit, we want the power consumption to be as
low
> > as possible, but if the circuit involves a microcontroller, we will need
a
> > voltage regulator like the 78L05 or 7805 to keep the 5V stable. Since
the
> > supply voltage is at least 2V higher than the 5V, part of the current
will
> > be bypassed through the regulator, in other words, the regulator
> > "consumes"
> > some power even when there is no or little current demanding by the
> > microcontroller circuit itself.
> >
> > Is using the regulator unavoidable? What is the usual methods to reduce
> > power consumption for a battery operated microcontroller circuit?
> >
> > Thanks in advance!
> >
> > John
> >
> >
> >
> >
> >
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