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BQ25798: Connecting USB D+/- to device and using for data on another endpoint device

Daniel Day
Prodigy 30 points
Part Number: BQ25798
Other Parts Discussed in Thread: TPS25730, , TS5USBC41

Tool/software:

My design incorporates a BQ25798 for charging a 2S lithium battery and a sink-only PD controller TPS25730 connected to a USB-C receptacle. 

First question, are the D+/- pins of the BQ25798 required to be connected to the USB-C data lines? Can I simply leave the pins on the BQ25798 disconnected and connect D+/D- pins of the USB-C straight to another device in my design that is a USB data endpoint or would I need a 2:1 USB mux device such as a TS5USBC41 so that both endpoints can be connected to the same data lines?

Second question, when the PD controller negotiates any higher voltage than 5V VBUS with charger connected to the USB-C receptacle, will the data on D+/D- still operate normally while the battery is charging with the higher voltages on VBUS?

  • +1
    TI__Guru**** 158961 points

    Hi Daniel,

    You can leave the BQ25798 D+/D- pins floating or short them together but not connected to USB-C port.

    The PD controller uses CCx lines to negotiate current and voltage not D+/D-.

    Regards,

    Jeff