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BQ20Z655-R1: BQ20Z655-R1 unchangable register values

Mett
Intellectual 340 points
Part Number: BQ20Z655-R1

Hi,

I've designed 2 series battery pack with bq20z655 r1. I connected the cells in order to 1N /1P / (2P-3P-4P short) to my pcb of my battery pack. Then I charged it a few seconds. But I couldn't change any value on bq EVSW after I connect battery pack to my pc on SMBUS. Bq20z655 set its CUV flag because of 2S connection. The boxes became red when I change the values. It didnt let me to change anything even CUV time or design voltage.

I was able to change one of my battery packs register values by trying Full Access Mode, sealed mode, calibration section. I've tried same path for other battery packs even SS and FAS are clear but it didn't work.


How can I to be allowed to change the values of bq20z655- R1?


Thank you.

  • 0
    TI__Expert 6575 points
    Hi,
    Most likely the issue is that the Voltage is below your "Flash Update OK Voltage" in your data flash settings.
    The easiest way to be able to write to this dataflash will be to put the gauge in Calibration mode using ManufacturerAccess() (0x00) command 0x0040 (Calibration Mode)
    The first value to change would be the "Flash Update OK Voltage" and it can be set as low as 4500mV.
    Regards,
    Swami