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TPS65981: Handling USB Data Lines for USB 3.0

David Perez56
Prodigy 70 points
Part Number: TPS65981
Other Parts Discussed in Thread: HD3SS460,

Some questions on handling the USB data lines. In the TPS6598x documentation, the USB data lines (D+ and D-) are routed through the chip and if USB 3.0 is needed then the two additional high speed diff pair lanes are routed through the HD3SS460 mux.

In some competing chips, the D+ and D- lines are not routed through the chip and it lets the connector handle the swap because of the way it got pinned out.

Do the TPS6598x chips need to have the D+ and D- lines routed through the chip? Is this so that the chip can interrogate the device\cable plugged in?

Similar question for the HD3SS460 mux, why can't the connector handle the connection swap?

I don't need the Display port, is there a smaller mux available to handle a non-display application?

  • 0
    TI__Genius 10370 points

    Hi David,

    Welcome to e2e! The short answer to your question is no, but it's NOT recommended. The connector does not handle the connection swap, but one could create a stub at the D+/- lines (instead of muxing) but the signal integrity might decrease, the layout routing will be trickier (in order to keep it as a diff pair), and the BC 1.2 detection feature will be neglected. For this reason, we create our devices so that you can route all four USB2.0 lines into our PD controller so that it can mux those signals properly without signal loss. 

    If using the superspeed lines (USB3.1), one will need to use a superspeed mux (active or passive). This is needed in order to create the flipibility functionality of the Type-C cable. For any further questions on the HD3SS460, could you create a different thread with that part number? Let me know if you have any other questions about the TPS65981/2/6 family of parts. I hope this helps :-)

  • 0 in reply to Aramis P. Alvarez
    Prodigy 70 points

    Is there another mux part number you can recommend to partner with the TPS65981? I don't need the display port, just need the high speed data lines, therefore I believe I can use something smaller.

  • 0 in reply to David Perez56
    TI__Genius 10370 points

    Hi David,

    I believe the HD3SS460 mux is the cheapest USB 3.1 mux we have, and it's used for USB 3.1 Data even if alternate mode isn't used. Feel free to post any questions to the HDS3SS460 forum so that one of our engineering experts on that team can help you further. I hope this helps :-)