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Lpc2000

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Message

Unrelialble 2132 start-up problem.

2006-02-03 by johnsonnenberg99

My LPC2132 fails to start running about 1/100 power-ups. 99 out of 
100, everything is OK.  
The Symptoms when if fails:
 a) Crystal does not oscillate. No voltage on either crystal osc 
pin. 
 b) No firmware appears to ever run or initialize anythign in my 
hardware.
 c)I/O pins are still inputs. 
 d)P0.14 is pulled low by CPU (I have a 10K P/U on it).  This 
symptom baffles me.  

When it is broke, I tried asserting reset low manually.  It does not 
clear the condition.   P0.14 stays stuck low, even with a manual 
reset. (power stays on through the reset. )

 I have checked the usual issues (P0.31 is pulled-up w/10K, P0.14 is 
pulled up w/10K, P1.20 is pulled up w/4.7K, PU on all JTAG lines 
except 10K PD on TCK)  

I've got a number of boaords doing this.  Power on, reset was 
assered properly, but XTAL does not start.  CPU appears to be 
dead.    Any ideas would be much appreciated.  

Some I/O pins go to circuits that have zigh-z (>1Mohm) paths to 5V, 
and the 5V does come up before the 3.3.  Could this be it?  

Thanks in advance for any comments.
John

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