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BQ78350-R1: Start (automatically) a charge cycle

jan stappers
Prodigy 160 points
Part Number: BQ78350-R1
Other Parts Discussed in Thread: BQ78350, BQ76200, BQ76930

Dear,

We are using the BQ78350 in combination with the BQ76930 and BQ76200. We can controll the Charge and Discharge fet with the test commands, but we do not understand how to let charging algorithm do it. How do we say that it can start charging when we hookup a charger with it, is there somewhere a command to initiate a charge cycle? We use a dumb charger which has no (smbus-)communication. That's why we have implemented a charge fet and precharge fet. It doesn't seem to be a hardware issue, but rather a config issue.

Best regards,

Jan

  • +1
    TI__Guru* 81035 points

    Hi Jan,

    There is a command (0x0022 FET Control ) that toggles the FET_EN bit. Alternatively, you can set the FET_EN bit in the Mfg Status Init data flash register so that the FETs are enabled automatically. 

    The FET Options data flash registers has different options you can review and configure for the desired behavior (behavior during Sleep, behavior at charge termination, etc).

    Best regards,

    Matt

  • 0 in reply to Matt Sunna
    Prodigy 160 points

    Hi Matt,

    This indeed solved the issue for us. We do have a follow up question on this. If we set FET_EN bit, is there then a way to controll the fets externally over smbus, without changing the status of FET_EN? 

  • 0 in reply to jan stappers
    TI__Guru* 81035 points

    Yes, there is a HostFETControl feature described in the TRM. It is a little tricky to use though.

    Best regards,

    Matt