Re: LPC2188 current?

I wrote:
The closest thing I see to a spec for that is Idd with
32kHz active (which I don't need), 12MHz stopped, and DC-DC converter
supplying 1.8V. That spec is 200 uA, from which I assume that the
corresponding Ibat would be more than 400 uA at 0.9V (low end of
battery range).

linnix <me@xxxxxxxxxxxxxxxxxx> writes:
Only if the DC-DC up converter is 100%. Boosters are difficult to be
that high.

Hence my use of the phrase "more than".

Or will the RAM be kept alive by the DCDC_Vbat pin

Probably not, only the DC-DC converter is kept in standby. No power
to the processor.

Philips seems to be trying to push this part for battery-powered
applications using a single alkaline cell, but if the DC-DC converter needs
to run to keep the RAM alive, the actual standby current will be fairly
high, and it will actually be a very poor choice for such applications.

I am dealing with the same issue with an AVR (which claims 20uA at
1.8V standby). What they don't tell you is that it takes over 200uA
at 5V standby. So, I need another 1.8V AVR to turn on the 5V AVR.
Unless I measured it wrong, I am getting my butts kicked for this.
Don't assume anything without written confirmations (in datasheets)
and verifications (measured results).

Yes, I've been down that sort of path before too, which is why I'm
asking the questions now rather than jumping right in.

There's so much extraneous crap on the commercially available LPC2888
boards that I don't think I could use them to test the power consumption.

Thanks,
Eric
.