piclist 2000\12\09\075558a >
Thread: Reducing shutdown power in RC Oscillator mode
picon face BY : Peter L. Peres email (remove spam text)

>other solutions

Use a FET to turn on the resistor (between +Vcc and upper end of resistor)
and a PIC pin to turn it off. The FET will need a 5M6 or so bias resistor
to give it the proper opening when the PIC pin is tristate during reset. 2
parts. If you work at 3V then it may be interesting to locate a FET with a
low enough Vp. Down to 1.2V is possible afaik. The FET bias resistor will
consume Vcc/5M6 (or 10M) A when the FET is turned off. This is probably a
fraction of the self discharge current of the battery.

hope this helps,


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