Lpc2000

At 11:56 AM 12/23/03 -0500, you wrote:
>Is anyone using anything but linear regulation?

If you have a good low voltage supply (like 5V) already I can't see why you 
would use anything other than a linear (other than running off of a 
battery).  Less noise, fewer components, lower cost in small qtys, no 
magnetics.  Of course if you already have a switcher a few extra winding on 
the transformer may not be an issue (other than sourcing the transformer)


>I don't remember seeing them, but there have to be power
>supply sequencing requirements.  Does anyone know what
>they are?  (page numbers in the manual where I failed to
>read them)

Apparently there are none. I asked the question on Philips forum, their answer

"                 The only thing you have to take care is to keep RST low 
until power supply reaches level specified by the data sheet, X1 signal is 
present and stable, and requested 10 ms expire. 10 ms window is chosen 
based on measurements
                  when even in the worst case, LPC2106/05/04's oscillator 
using external crystal would start to operate properly (measured from the 
moment when specified power supply is applied, till stable signal on X1 is 
detected). "

http://forums.semiconductors.philips.com/forums/viewtopic.php?t=3576

That's the most complete answer I've managed to get out of them so far.

Robert