How can a battery powered PIC turn itself off?

[sougata]

Hi,

If your circuit is not powering other blocks having higher quiescent current you may use the PICs sleep mode. Nanowatt PICs with internal or LP oscillator works great and never lets me down.
Advantage : You might end up using a single CR2032 for your circuit. Cause your circuit drops out at least 0.6 volts and PICs works from 2 volts.

[Sean_Goddard]

Had the same problem, then I looked carefully at the circuit and laughed my head off!

Like you I switched the POSITIVE side of the power....BAD MOVE..put the FET in the NEGATIVE rail so the circuit you want to power is effectively the LOAD use a pull down resistor of 10K or so and ALL will be well.

Took me a while to figure this out, but if you look at what is happening then it's obvious.

Hope this helps.