Lpc2000

Landrum Haddix wrote:

>Update:
>
>The other day I reported it seemed my LPC2138 was hanging with the
>clock stopped and the internal watchdog not working.
>
>Turns out the processor was running so the watchdog was being stroked
>hence not firing.
>
>What was happening were I/O lines were changing state after an ESD hit.
>In my case this turned off most of my board making it look dead.
>
>Only some I/O lines were flipping, so it's not an easy state to detect.
>
>I've seen this before, I guess it means I need to keep internal copies
>of the ports and periodically refresh them. Of course this will only
>work for logic that can handle a pin toggling as long as it returns to
>the correct state. Something edge triggered would hate this.
>
>Anyhow we solved the ESD problem by metallizing the plastic lid
>enclosing the board.
>
>  
>
I was going to offer the Faraday Shield as a solution.... heh

TomW


-- 
Tom Walsh - WN3L - Embedded Systems Consultant
http://openhardware.net, http://cyberiansoftware.com
"Windows? No thanks, I have work to do..."
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