On Sun, 6 Aug 2000 13:08:12 -0400, you wrote:

>I have a countdown timer (seconds only) with 7 segment displays (4).
>Basically, after it reaches zero and sounds the piezo, I have it go to
>sleep.
>
>I plan to power this with 3 AA cells.  The current draw in sleep mode is
>9ma.
I assume you are still running the LEDs - current draw in sleep mode
should be 5-20 microamps, depending on whether the watchdog is running
or not.
>How long will the batteries last in sleep mode??
Capacity of an AA alkaline is about 2400mAHrs, so a PCI in sleep mode
with no extra drain will last pretty much forever, or at least until
the batteries are leaking goo..=20
>What do I look for to get the sleep current as low as possible??
Make sure no inputs are floating and outputs are not sourcing current
anywhere.
Oh, yes... and TURN THE LEDs OFF!
>The PIC is 16F84
>
>John Mullan

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