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Thread: 16F84A power savings....
www.piclist.com/techref/power.htm?key=power
face picon face BY : Jinx email (remove spam text)



> It is possible to run 16F84a in low power for a door
> bell solution?

Hi John. The simplest way would be to put the PIC to SLEEP
and use INT0 to wake it up

> How long would it run on batteries ?

Power-down (SLEEP) current should be around 400uA (I think)

An average 1.5V AA alkaline would be rated at about 800mAh,
which should give 800mAh/0.400mA = 2,000 hours. A PIC that
can run at lower voltages would keep going for some time more

> Is there any pic with PDIP that can run longer ?

New nanoWatt part have significantly lower SLEEP current. As
low as a few nA, about 1/40,000th that of the F84. This would
give you 800,000,000nAh/10nA = 80,000,000 hours (batteries
would start running out sometime around 11,000AD). The 16F88
is 0.3uA

Reduce operating current when out of SLEEP by having a low
frequency and/or Vdd

<01a701c5ad15$4fc73160$0100a8c0@ivp2000> 7bit

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