BQ40Z50-R2: PFStatus(TS1)

Part Number: BQ40Z50-R2

Hello guys,

I use many bq40z50R2 and sometimes i get after assembling an permanent failure which disables CHG and DSG Fets.

Question:

1. At which condition the PFStatus(TS1) trips? I don't mean PFAlter(TS1)! I can't find any correlation in the TRM.

2. At different boards i get different values: Data Memory(bqStudio) > PF Status > Device Temperature Data > External 1 Temperature: For example -53.8°C or -75.9°C or -32.6°C.
When and how are this values written? Internal and External Thermistor 1 in usage.

Thanks vor help.