On Mon, 21 Oct 2002, Mike Harrison wrote:

*>..and most of that is the Watchdog..... I'd say an external micropower
*>brownout chip would be more useful than the WDT in this sort of
*>application.

My datasheet says up to 1/3 of the power is the watchdog. I am not using
external reset or brownout, the wdt is the only thing that recovers the
cpu from la-la land.

At 30uA a 250mAh lithium battery will keep it running for over a year. A
supercap will run it for a week (with Vstart = 5V, Vend = 2.5V, 0.22F I
think).

Having very low power mcus probably would make a lot more sense if smaller
batteries were available and inexpensive ...

Peter

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