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BQ25892: BQ25892

Redwood
Expert 1060 points
Part Number: BQ25892
Other Parts Discussed in Thread: BQ28Z610,

Hi, 

I am designing a battery management system by using bq25892(charger) and bq28z610(gauge).  

I need to set the bq25892 and bq28z610 into Constant Current mode and Constant Voltage mode. 

Question1: What are initialization set of registers and their values for these two chip sets given above?

Question 2: What are the registers needs to be updated when we switch from constant current to constant voltage or vice versa?

  • 0
    TI__Genius 10240 points

    Hi there,

    For BQ2589x charger, REG04 sets fast charging current in Constant Current mode and REG06 sets fully charged battery voltage in Constant Voltage mode. You don't need to update the register as the charger will control the CC or CV mode transition depending on the battery voltage. 

    The circuit diagram is a dual charger solution that you might not need. Dual charger solution is for higher charging current that one charger can't provide.   

  • 0 in reply to ezhao
    Expert 1060 points

    Hi, 

    I need to set the constant current and constant voltage depends on battery temperature based on battery charging profile.

    QUESTION 1: How can I program the multiple constant voltage constant current multiple setting based on temperature and charging state machine?

    QUESTION 2: Voltage and Current are measured by both charger(25892) and gauge(28z610). Which measurement of device( charger or gauge) should I use? What happens if there is an offset between them?

    Please see the flow chart below, please guide me how to implement the flow chart below by describing which value comes from which device ( charger(25892) or gauge (28z610) ) ?????

    Thanks and best regards, 

  • 0 in reply to Redwood
    TI__Guru 57441 points

    Hi,

    Please refer to https://github.com/tibms/bq2589x and https://github.com/tibms/dual-bq2589x for sample drivers on single and dual chargers.

    Thanks,

    Ning.