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BQ34Z100: the capacity of the power-up initialization of the fuel gauge is 0 for both FCC and RCC

Hale Tan
Expert 3770 points
Part Number: BQ34Z100
Other Parts Discussed in Thread: GPCCHEM, GPCRB

We have a new question about BQ34z100. Recently the customer use BQ34z100 to test battery. But as shown in the figure, at -20℃, the capacity of the power-up initialization of the fuel gauge is 0 for both FCC and RCC. And if they raise the temperature above -10℃，they will get a normal data. Have we ever had a similar situation? Or do you have any advice? What designs or operations do we need to focus on or check?

  • 0
    TI__Guru 57697 points

    Hello Hale,

    Cell attach must be done at room temperature. The gauge will only set parameters after it initializes. At such a low temperature, the initialization routine may return error.

  • 0 in reply to Shirish
    TI__Expert 3770 points

    Hi Shirish,

    So do yo mean that the system can't initialize in -25℃？As you say, gauge will only set parameters after it initializes, but in customer application, they have to initialize at -25℃? Do you have any advice how to solve this problem? Or after a single initialization at room temperature, can  the system no longer be initialized, and can be operated directly at -25°C? 

  • 0 in reply to Shirish
    TI__Expert 3770 points

    Does the initialization need to be repeated every time when the reboot occurs？

  • 0 in reply to Hale Tan
    TI__Guru 57697 points

    Hello Hale,

    The bq34z100 is normally used on pack side where it is always powered, so initialization is entered only once.

    Another point to note - At -25C the FCC will actually be lower and some batteries have barely enough power. Did you run the GPCRB optimization for low temperature after doing GPCCHEM?