Lpc2000

Hi Michel,

for the RTC running the current draw from Vbat is between 15 and 20
uAs for the LPC2138, don't have numbers for the LPC2148 yet but should
eb very similar. 

In sleep mode (power down mode) with buffering the entire memory of
the LPC2138, we saw around 50 uAs from Vdd. Be aware that the status
of the port pins is retained and some ports have a pull-up build in.
If you drive a "0" to a port pin with pull-up, your power down current
goes up a lot!

Another thing we saw, when the LPC2138 get's hot (e.g. dark box in
plain sunlight, guess 70-90C) the power down current can go up to a
couple hundred microamps, but I heard this is true for all the new ARM
devices because of the small processes they are built with.

I guess that is why the max power down current is specified so much
higher than what we measure, because it has to cover the whole
temperature range to 85C

Cheers, Bob

--- In lpc2000@yahoogroups.com, "Gazelle" <michel.heuts@t...> wrote:
> Dear Philips people, 
> Dear Forum,
>                                 Has someone experience with the
standby current of the LPC213x and LPC214x derivates
> and can tell me what to expect what to expect when the core is in
sleep mode with and without the RTC running.
> Is there also possibility to wake up the core with a timer running
in the background and what would be the expected
> stand-by current in that "sleep mode" ? Are there graphs available ?
> The aim is to build a small POS printer on ZigBee and power
management with a portable device is always an issue.
> 
> Thanks for all technical input !
> 
> Have a nice weekend
> 
> :-)
> 
> Michel
> 
> [Non-text portions of this message have been removed]