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TUSB320: TUSB320IRWBR – 15W Charging + USB2.0 DFP Host Mode

Tom Tsao
Expert 2340 points

Part Number: TUSB320

Tool/software:

Hello TI team,

Can TUSB320IRWBR support the following case?

Type-C port provides 15W charging (5V/3A, DRP, external adapter powers the board)

At the same time, USB2.0 D+/D- works as DFP (Host Mode) to connect a mouse/keyboard.

In this case, should CC logic be set to I2C mode or is GPIO mode sufficient?

Thanks,

  • +1
    TI__Guru 55845 points

    Hi Tom,

    The TUSB320 would be located on the motherboard, correct? In this case, would one port be expected to be both charged by the type-C connection while also providing power to the Mouse/KB, or would there be two separate ports, one for each connection? In this case, the TUSB320 would not be able to act as power a power sink and power source, unless the Mouse/KB is being powered externally.

    If the TUSB320 does not need to provide power to the Mouse/KB, and only connect the data lanes, then this connection would work with the TUSB320 configured as a UFP.

    Tom Tsao said:
    In this case, should CC logic be set to I2C mode or is GPIO mode sufficient?

    This depends on what functionality is needed. If you want the ability to control the mode of the TUSB320 or monitor the CC controller's status registers, then you can use I2C mode. Otherwise, GPIO mode also works.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Expert 2340 points

    Hi Ryan,

    Thank you for your reply. I would like to provide some clarification regarding our use case:

    The TUSB320 is located on the motherboard.

    1. We need to confirm whether the Type-C port can support 15W charging (5V/3A Power DRP), where an external 5V/3A charger provides power through VBUS to charge the motherboard. In this case, no mouse or keyboard is connected.

    2. When the motherboard is powered by the adapter, the same Type-C port’s USB2.0 D+/D- lines will be connected to a mouse or keyboard. In this scenario, the Type-C port is expected to operate in USB2.0 OTG mode (or considered DRD mode).

    Could you please confirm if the TUSB320 can support both of these use cases?

    Thanks,

    Tom

  • +1 in reply to Tom Tsao
    TI__Guru 55845 points

    Hi Tom,

    Tom Tsao said:
    We need to confirm whether the Type-C port can support 15W charging (5V/3A Power DRP), where an external 5V/3A charger provides power through VBUS to charge the motherboard. In this case, no mouse or keyboard is connected.

    The TUSB320 can support this.

    Tom Tsao said:
    When the motherboard is powered by the adapter, the same Type-C port’s USB2.0 D+/D- lines will be connected to a mouse or keyboard. In this scenario, the Type-C port is expected to operate in USB2.0 OTG mode (or considered DRD mode).

    So in this scenario, the type-C port is not being used to power the motherboard and is being powered from a different source, correct? In this case, yes, the TUSB320 would be able to configure as either a DFP or UFP when set to act as a DRP, so it would be able to support a mouse or keyboard.

    Thanks,

    Ryan