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CCS/BQ40Z60: Charge FET Permanent Fail

Emma Wang_DELL EMC
Intellectual 695 points
Part Number: BQ40Z60

Tool/software: Code Composer Studio

Hi TI:

   I encountered one Charge FET Permanent Fail.This failure happened after updating FG FW. There is no other PF. In our application, CFET:OFF Threshold is 5mA and CFET:OFF Delay duration is 5s. I noticed this failure will come out when CHGR off AND CHG FET off AND Current() continuously ≥CFET:OFF Threshold for CFET:OFF Delay duration.

1, What is CHGR off? How does this IC recognize this status? Which flag or other indication?

2, How does this IC recognize CHG FET off? Which flag or action?

3, How do CHGFET, DSGFET, charger FG behave when updating FG FW or after updating FG FW?

4,Why does CHGR become off?  I think updating is a normal process and in normal case CHGR will not disable.

5,Why does CHG become off in this normal update process?

6,Could you help analyze why there is one PF in this scenario?

7, Why is default CFET:OFF Threshold  5mA?

I attached our setting.7_19_6_3 version.gg - Copy.xlsx

Thanks!