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Lpc2000

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Message

power & sleep

2006-04-05 by Steve Franks

Hi all,

I'm beginning to get curious about power-consumption on 2103 and 2148
series.  It's unclear to me from the UM if the watchdog runs in both
idle and power down modes.  It looks like it initialtes a 'real'
reset, so it must be able to wake the part out of power down, but
obviously only if it's clock is running.  I've got some mote-stuff on
AVR I'd like to try moving to LPC, but you really need to get the
sleep down to 10uA for it to be effective, and be able to wake up
without power-hungry external devices.  The AVR uses the watchdog to
wake up from 10uA sleep.  Also, the datasheet I have from novermber is
filled with "tbd"'s for all the power consumption specs, so if anyone
has hard data, that would be appreciated.  Can the 2148 come out of
power-down from the rtc?  It doesn't appear to do a 'hard' reset like
the watchdog, so probably not?  I see that the rtc on the 2103 will,
in fact, wake from power-down, so maybe I'm worng about the 2148.

Anyone else implemented a battery powered system that mostly sleeps in
an LPC?  Pitfalls?

Thanks,
Steve

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