Peter Todd <pete <at> petertodd.ca> writes:

> 
> I've been tasked with making a very simple device that will turn an LED
> on for one minute every day. I'm using a 16f683 with a DS32khz for the
> timekeeping and have designed a nice circuit that seems to use about 5uA
> sleeping and keeps accurate time.
> 
> The application also needs to have a button, that when pressed starts
> the device up and starts it's led on, led off routine. Before that I
> want the device to be completely off, drawing no current from the
> battery, after pressing the button, it should apply power to the DS32khz and
> PIC. This should be a latch, so pressing the button again has no further
> effect.

Peter,
how about RS flip-flop using 74HCT logic or similar low power one? Off-current 
consumption should be very small.

Sergey Dryga


-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist