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BQ76PL455A-Q1: How to check fault source when STACK_FAULT and STACK_FAULT_DET are read "1"

Miles Li1
Intellectual 1640 points
Part Number: BQ76PL455A-Q1

Hi Taylor,

In customer application, STACK_FAULT and STACK_FAULT_DET are read "1". How do I check the fault source? 

As described in datasheet, "Under-frequency conditions will set the STATUS[STACK_FAULT_DET] and STATUS[STACK_FAULT] flags.", what does under-frequency conditions mean?

Wish to get your reply as soon as possible.