Lpc2000

At 11:04 AM 5/5/04 -0700, you wrote:
>I don't know if this is useful or not, but when building our flash
>cable for our device, we were advised to not hook a cable directly
>from the pc to the lpc because of the higher voltage (5v). Our
>designer was concerned that we'd fry the part, even though (I think)
>the docs say the lpc is tolerant to 5v (at least some pins).

You definitely should not hook up the serial port directly to the micro. 
+/-12V on those pins is well within the expected range from serial 
ports.  I would not expect the micro to be very happy with those voltages.

>All the board designs we looked at with the lpc all had
>the max3232 transceiver in between the cable and the lpc. Instead of
>putting this in our board, we put it in a makeshift cable. It's been
>working fine.

I'm just finishing up testing on a board that provides that link to a 
standard 8 pin header (there was an earlier discussion on the header see 
http://www.open-research.org.uk/ARMuC/index.cgi?Standard_ISP_Header for a 
description) as well as a few other niceties.  Should be inexpensive and 
more reliable than a one-off.

Robert

" 'Freedom' has no meaning of itself.  There are always restrictions,
be they legal, genetic, or physical.  If you don't believe me, try to
chew a radio signal. "

                         Kelvin Throop, III