Lpc2000

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

I have tried to see what is the lowest power during sleep, and I think if
you are expecting anything near to 10uA, I doubt if you could achieve on LPC
series. Mine came down to about 300uA on 2106 but not further. Newer one I
tried on 2132, it consumes more than 2106 during sleep, may be because it
has its own internal 1.8v regulator. Probably that extra current is consumed
by that regulator.

I would be trying lowest power regulators later (3.2uA for 3.3V and 18uA for
1.8V) probably at that time I can let you know what are my consumption
levels.

Thanks
Yug

On 4/5/06, Steve Franks <stevefranks@...> wrote:
>
>  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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[Non-text portions of this message have been removed]

--- In lpc2000@yahoogroups.com, "Yugandhar Vasi" <yugandhar.vasi@...>
wrote:
>
> I have tried to see what is the lowest power during sleep, and I
think if
> you are expecting anything near to 10uA, I doubt if you could
achieve on LPC
> series. Mine came down to about 300uA on 2106 but not further.

This is generally true about most ARM7's, but the lpc2103 is a special
device. It has special circuitry to power down portions of the chip
that aren't being used, and it's sleep performance is also better.

The spec sheet was just updated recently with some current info.

Active mode (no peripherals in use), 1.8 volts
10 Mhz  = 7 ma typ
70 Mhz = 41 ma

Sleep mode = 7 ua (micro-amps)

This is incredibly good for an Arm! The new lpc2888 is also supposed
to be designed with low power consumption in mind.

If you need less current than this, you can use an MSP430, but it's
going to be slower.

Eric