Lpc2000

The number of despiking caps you need is affected by issues such as 
how much current you are drawing from the pins to drive things like 
led's and other low-impedance loads.  You might get away with less 
than one cap on each power pin when the I/O pins are lightly loaded, 
but for safety don't count on it.

I like empirical experimentation.  If you're interested in finding 
out what's really needed set up a proto board with the kind of loads 
you anticipate using, then start pulling off despiking caps until the 
system gets erratic.

Bill T.
http://www.kueprcontrols.com



--- In lpc2000@yahoogroups.com, "Alexandre Guimaraes" <listas@l...> 
wrote:
> Hi, Owen
> 
>     Nice layout...  Thanks..
> 
>     Is just one 0.1uf cap enough for decoupling the LPC2138 ?? 
Wouldn't it 
> be necessary to use one cap for each power pair ?
> 
> Best regards,
> Alexandre Guimaraes
> 
> 
> 
> ----- Original Message ----- 
> From: "Owen Mooney" <ojm@s...>
> To: <lpc2000@yahoogroups.com>
> Sent: Monday, July 11, 2005 6:45 PM
> Subject: [lpc2000] Re: Two layer PCB and LPC2000 and EMC
> 
> 
> > Uploaded as pdf to the files section crt diagram + images.
> >
> > Owen
> >
> >
> > Hi, Owen
> >
> >    Would it be possible to have a image of this part of the 
board ? It
> > would help a lot many of us that are starting to work with the 
LPC's.
> >
> > Best regards,
> > Alexandre Guimaraes
> >
> >
> >
> >
> > Yahoo! Groups Links
> >
> >
> >
> >
> >
> >