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BQ25895M: BQ25895M & D+ D- & MCU

Gary Gaooo
Intellectual 775 points
Part Number: BQ25895M
Other Parts Discussed in Thread: BQ25895, BQ25898D

the BQ25895M has pin for D+ D-，the question is  the  D+ D- can also connect the MCU with connecting to BQ25895M？

  • 0
    TI__Genius 13595 points
    Hi,
    In general application, most customers will connect BQ25895 D+/D- pins with MCU D+/D- pins.
    For BQ25895 D+/D- pin will be open after it finished input power source detection.
    Thanks
  • 0 in reply to Paul Yeh
    Intellectual 775 points

    like this?

    and which control the switch？MCU or BQ25898D？

  • 0 in reply to Gary Gaooo
    TI__Genius 13595 points

    Gary,

    There are two solutions for D+/D- connection. one is directly connected together as I mentioned. the other is using external multiplexer as you posted.

    I also attached one diagram for your reference. But even BQ25895M open D+/D- pin but there still has few capacitance to impact D+/D- signal quality.

    So some customers will use external multiplexer to improve D+/D- signal quality.

    And you can use BQ25895M's DESL pin (pin24) to control this multiplexer.

    Thanks

    Connect the DSEL to a logic rail via 10-KΩ resistor. The pin is normally float and pull-up by external resistor. During Input Source Type Detection , the pin drives low to indicate the device D+/D- detection is in progress and needs to take control of D+, D- signals. When detection is completed, the pin keeps low when MaxCharge™ adapter is detected. The pin returns to float and pulls high by external resistor when other input source type is detected.