Stef Mientki wrote:
>> Right.  That's why I'm using my own external 250nA wakeup timer.
>
> Wow, any change we might see the schematic ?

There's no wow or magic.  It's just a regular transistor oscillator with
large resistors.  It's also very inaccurate, but so is the watchdog and it
doesn't matter for the same reason.  This timer fires every 50-200mS
depending on voltage part variations, phase of the moon, etc.  Every 1000 or
so timer ticks I leave the internal 4MHz oscillator of the PIC running to
measure the timer.  Since that's only .1% of the time, it doesn't add much
to the power budget.  The unit's temperature and battery level don't change
that much in 50-200 seconds.


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