>
> Hello Bob,
>
> One other thing I was wondering about. You mention the LPC2138 uses
> an internal DC/DC converter. Is this shown anywhere in the
> datasheet or user guide. I may have just missed it.
>
> Can you tell me is this a charge pump DC/DC converter or an inductor
> based. If its inductor based, is there a requirement for an
> external inductor? Or maybe its a linear regulator?
>
> Sorry if this is already shown in the documentation somewhere and I
> missed it. I was just wondering why philips did away with bringing
> a 1.8V core voltage out on the pins. I kind of wished they had left
> it like the 210x, my battery powered app could use the lower core
> voltage to advantage.
>
> Thanks again,
> Jeff
>
>
>
> --- In lpc2000@yahoogroups.com, "wittrockjeff" <jwittrock@m...>
> wrote:
> >
> > Hello Bob,
> >
> > Very helpful information.
> >
> > Thanks so much
> > -Jeff
> >
> >
> > --- In lpc2000@yahoogroups.com, "lpc2100_fan" <lpc2100_fan@y...>
> > wrote:
> > >
> > > Hi Jeff,
> > >
> > > some measurement from our team:
> > > Running at 60 MHz with peripherals enabled from Flash approx. 45
> > mAs,
> > > running from RAM 52/53 mAs, external 12 MHZ PLL *5 to 60 MHz. All
> > > preipehrals were anabled.
> > >
> > > The core still uses 1.8V but the 1.8V are generated by a DC/DC
> > > converter inside the chip.
> > >
> > > Specification is 3V for function, reducing the voltage lower
> than
> > that
> > > is OK but we want to use the Brown Out Detect which hit somewhere
> > > around 2.9V. Absolute no problem until the BOD hits. We even
> tried
> > to
> > > just generate an interrupt with BOD at 2.9 and the device worked
> > down
> > > to approx. 2.6V where the lower threshold BOD hit us with a
> Reset.
> > > As far as our tests can tell, the LPC2138 works actually down to
> > 2.6V
> > > but we won't try that. The upper level BOD will be used in our
> > design
> > > to save a few critical parameters into the Flash and then we go
> to
> > > Power Down.
> > >
> > > hth Bob
> > >
> > >
> > > --- In lpc2000@yahoogroups.com, "wittrockjeff" <jwittrock@m...>
> > wrote:
> > > >
> > > > Does anyone have some rough estimates of supply current for
> the
> > > > LPC213x family running at 60MHz with peripherals enabled. In
> > > > particular I want to use the LPC2138 device.
> > > >
> > > > Active mode supply current is still <TBD> in the datasheet.
> > > >
> > > > Since this device uses 3.3V for both the core and I/O, I'm
> > wondering
> > > > how close it will be to the LPC210x family. Does the LPC213x
> > still
> > > > use 1.8V for the core, and just an internal regulator?
> > > >
> > > > As an aside, I'm also wondering if the part will remain
> > functional
> > > > (reliable?) if the supply voltage drops to 2.85V?
> > > >
> > > > I would measure one myself, but don't have a board yet, just
> some
> > > > sample parts.
> > > >
> > > > Thanks,
> > > > Jeff W