Lpc2000

At 10:23 19.04.2006 -0400, you wrote:
>lpc2100_fan wrote:
>
> >i Herbert,
> >
> >did that with a resonator from Murata and the LPC2138.

Great.

>Works just fine
> >but for USB (and the RTC ;-) you need something more accurate than a
> >resonator.
> >If you use the 2148 for other features but the USB, than there should
> >be no problem.
> >

 From my experiance, if a ceramic resonator is reliable running, it works 
with USB as well. Ceramic resonators usually have 0.5% accurance, which is 
good enough for USB.

> >
> >
>Yeah!  Who cares if the osc wanders a few hundred PPM ? heh

No, this is not a problem, but I recently used it on a STM 8051 derivate 
with USB and I had to add a 4M7 resistor on the XTAL input to ground to 
avoid jitter I had without this resistor causing USB and serial port 
communication not to run properly.

So my question should have been rather "does it reliable swing without 
jitter" which was answered partially, thank you very much.

Herbert


>
>----------

----------------------------------------------------------
demmel products
Radnitzkygasse 43
A-1100 Vienna / Austria / Europe
Voice: +43-1-6894700-0
Fax: +43-1-6894700-40
Email: dh@...
WWW: http://www.demmel.com


[Non-text portions of this message have been removed]