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Original question:

BQ40Z50-R2: Is the SMBus really required for the battery assembly and charger to function correctly?

BQ40Z50-R2: Charging Battery Assembly without SMBD and SMBC connections to Charger IC

Joseph DeWitt
Intellectual 320 points
Part Number: BQ40Z50-R2
Other Parts Discussed in Thread: BQ40Z50

Tool/software:

HI,

My understanding is that without having SMBD and SMBC connections between the BQ40Z50 IC and the Charger IC, it is the Charger IC that controls the charging of the battery assembly containing the BQ40Z50 IC. With that being the case, how does the BQ40C50 IC know to apply a voltage to the CHG terminal on the IC in order to apply voltage to the gate of  CHG MOSFET to allow current to flow through it and therefore charge the battery assembly during charging?

Best regards,

Joe DeWitt

  • 0
    TI__Mastermind 37761 points

    Hello Joe,

    Ideally, in normal operation the CHG and DSG FETs will always be on (in certain scenarios like a protection tripping can cause the CHG and/or DSG FET to turn off). The Charger IC will need to know what voltage and current to apply to the battery for charging. If there isn't a direct communication between the gauge and the charger, then an MCU will need to be used to communicate this information.

    Regards,

    Adrian

  • 0 in reply to Adrian
    Intellectual 320 points

    Hi Adrian, 

    I appreciate the response. Will the PCHG always be on as well in the event there is no communication between the BMS IC and the Charger IC?

    Can you please direct me to a resource that will explain how to step through setting up all of the parameters within the BQ40Z50 BMS IC. Ultimately the goal will be to generate a "golden file" for production but in the meantime I need to program my battery assembly that is using the BQ40Z50 IC and will need to set the trip points, number of cells in use, current trip set point, etc 

    Thanks in advance for your help.

    Best regards,

    Joe DeWitt

  • +1 in reply to Joseph DeWitt
    TI__Mastermind 37761 points

    Hello Joe,

    If the PCHG FET is configured to be always on as well then yes.

    Yes, I will link for you the learning cycle document that explains the process for completing the learning cycle and setting the basic parameters to do so.

    https://www.tij.co.jp/jp/lit/an/slua903/slua903.pdf

    Regards,

    Adrian

  • 0 in reply to Adrian
    Intellectual 320 points

    Awesome, I appreciate the feedback. It is much appreciated.

    Best regards,

    Joe Dewitt