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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Unrelialble 2132 start-up problem.
2006-02-03 by johnsonnenberg99
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