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BQ40Z50-R2: CUV and CUVC faults not clearing

Part Number: BQ40Z50-R2

Hello, I'm having trouble charging my pack and I assume is because the CUV and CUVC alarms have been tiggered but not matter what I do I can't get them to clear. The symptoms are that as soon as I enable the charger the charge current goes up for a couple of seconds then it shuts OFF and then the charging current goes up again and shuts off again, this cycle repeats until I shut down the charger, I have gone through the process of getting a CHEMID and a gg file from TI and I have program both. I have also configured the settings for my application to the best of my knowledge but I might have missed something that is creating this issue. I have attached the a short log file and a gg file with my current setting.

Thank you,

Jose Salazar

SNAPTSHOT of REGISTERS

ADDC_Bat_CUV_Fail_log.logADDC_Bat_CUV.gg.csv

  • Hi, Jose

        It is because the PCHGC and CHGC are triggered when precharge starts, you should set an appropriate prechange charge current in your gg file, currently, it is set to 88mA, which is much lower than actual precharge current.