Lpc2000

Hi,

Recently I have been testing some circuits designed around a LPC2106
processor. All of the processors are Revision C with the same date
stamp. Out of ten prototypes that have been made, seven fail for
around 3% of all start ups. One prototype was monitored for 3,500
starts for one failure.

So I tried similar testing with a development kit that had a LPC2106
revision B on board and found the same results. Since the errata
released by Philips has admitted a fault with revision B locking up, I
replaced it with a revsion C only to find that for 4% of starts that
particular development kit and processor will fail at start up.

At this point I don't have feedback Philips, so I am wondering if
anyone else has done similar testing with(out) start up failures?

Naturally, I have tried to fix the problem by making mods to my
circuit, so I can post more background information...

Thanks,

(BTW- I am new to the forum concept, so please excuse me if I make any
faux pas.)

lpc2106_user wrote:

>Hi,
>
>Recently I have been testing some circuits designed around a LPC2106
>processor. All of the processors are Revision C with the same date
>stamp. Out of ten prototypes that have been made, seven fail for
>around 3% of all start ups. One prototype was monitored for 3,500
>starts for one failure.
>
>  
>

Yes, I had some problems too with the later parts.  Tie RTCK to GND and 
DBGSEL to +3volts.  The part then boots okay.

TomW


>So I tried similar testing with a development kit that had a LPC2106
>revision B on board and found the same results. Since the errata
>released by Philips has admitted a fault with revision B locking up, I
>replaced it with a revsion C only to find that for 4% of starts that
>particular development kit and processor will fail at start up.
>
>At this point I don't have feedback Philips, so I am wondering if
>anyone else has done similar testing with(out) start up failures?
>
>Naturally, I have tried to fix the problem by making mods to my
>circuit, so I can post more background information...
>
>Thanks,
>
>(BTW- I am new to the forum concept, so please excuse me if I make any
>faux pas.)
>
>
>
>
>
>
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>
>  
>


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