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BQ25611D: whether USB switch is needed when using BT MCU connect to BQ25611D?

GW
Intellectual 2370 points
Part Number: BQ25611D

Hi, Team

customer want to using our BQ25611D for the charger, they needs the BC1.2 so D+ and D- is need in SCH. And in their system, it also have a BT MCU, that is also needs the USB D+/-. Pls check the attach file. they want to check to us that, whether they can connect all the D+ and D- directly？ or it needs using a USB switch to separate the D+ D- lines?

Thanks.

  • 0
    TI__Guru 57781 points

    Hi,

    D+/D- pins are used for USB input current limit detection when VBUS power is plugged in. During the charger input current limit detection process, the host must be able to HIZ D+/D- pins so that D+/D- pins are driven by the charger. If the host is unable to HIZ D+/D- pins, a USB switch is needed to isolate the host and the charger.

    Thanks,

    Ning.