Thanks Jinx. Just the info i needed ;) Do you know how
to get data into the memory chip that the mcu could
play a song from? The worst case senario is that I use
a SPI setup to get the data into the memory
chip........

Regards,
John

--- Jinx <joecolquitt@clear.net.nz> wrote:

> > 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
> 
> -- 
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