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TPS65988DK: USB4 backwards compatibility w/ USB3 - USB PD controller

Manmeet Dhaliwal
Prodigy 90 points
Part Number: TPS65988DK

Tool/software:

This may be a silly question, but the TPS65988DK datasheet says:

This PD controller is only intended for use in
USB4 device designs

Can I safely assume that USB3.1 is supported, as USB4 should be backwards compatible w/ USB 3.1?

  • 0
    TI__Genius 16445 points

    Hi Manmeet,

    Thank you for reaching out on E2E!

    This PD controller is recommended for USB4/TBT4 reference designs that use an external USB4 controller/hub for actual data.

    The PD controller negotiates and can do an enter usb mode message, but it does not actually touch any of the data, it would be up to the hub to read the status of the negotiated PDO from the PD controller.

    Thank you,

    Kevin

  • 0 in reply to Kevin Kosta
    Prodigy 90 points

    Thank you, so in this case a USB 3.1 hub should work, the USB 4 listed in the PD controller datasheet is in regards to USB4 PD capabilities, not data, correct?

  • +1 in reply to Manmeet Dhaliwal
    TI__Genius 16445 points

    Hi Manmeet,

    Correct!

    The PD controller supports the USB-PD specification messages not the data itself, so in your case a USB hub should function based on the manufactures description since none of the data lines connect to the PD controller.

    This information about the negotiated contract can be read from Data Status register (0x5F) referred to in the Host Interface Technical Reference Manual 

    Thank you,

    Kevin