Hello,
We use msp430f6779 for a 3-phase meter application, based on application note SLAA577.
For some time we identified a critical problem, which is a showstopper on our side - the circuit resets without any reason.
We tried to isolate the problem, and it is related to temperature. We've conducted the following experiment using a temperature chamber:
3 different units powered with only Vcc (no AC inputs, Vcc directly connected from DC power supply) and placed in the temperature chamber showed resets above a certain temperature (45-55 C), getting worse as temperature climbed.
1. Someone suggested that maybe the temperature safeguards going off too soon. Could it be the case? Is someone familiar with such an issue?
2. We found an Errata (PMM18) which refers to over-voltage protection – which causes software resets – going off too soon, and it gets worse at higher temperatures. How can I test if this is indeed my case? And if it is my case - how can I workaround it? Does it have a fix in some version of the silicon (different mask / HW revision)?
Thanks,
Lior.