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TUSB1044: Placement suggestion

Antony Lin
Genius 13480 points
Part Number: TUSB1044

Hi,

Is there any different design consideration for two TUSB1044 application scenarios listed below?  What would it be?

  1. TUSB1044 is placed between  "PD controller" and "CPU(or TBT) with type-c 4:6 MUX embedded"
  2. TUSB1044 is placed between  "TYPE-C connector" and "PD controller with type-c 4:6 MUX embedded"

What is the minimum distance allowed between TUSB1044 and TYPE-C connector?  1.5 inch?  How should we judge the suggested location of TUSB1044 for 2nd scenario mentioned above?

Thanks!

Antony

  • 0
    TI__Mastermind 32881 points

    Hello Antony,

    Could you please clarify? You should not need to put a redriver between your PD controller and your CPU, because the PD controller only sits on the CC lines, and TUSB1044 is for your SSTX and SSRX lines. As far as the minimum distance between TUSB1044 and type c connector, I don't believe there is a minimum distance between the connector and the TUSB1044, as long as you can place your decoupling capacitors in between. This FAQ could also help you answer some of your placement questions about the TUSB1044.

    https://e2e.ti.com/support/interface/f/138/t/719929?tisearch=e2e-sitesearch&keymatch=faq%3Atrue


    Best,
    Gerasimos

  • 0 in reply to Gerasimos Madalvanos
    TI__Genius 13480 points

    Hi Gerasimos,

    On the type-c signal path which support DP, a type-c 4:6 MUX is a MUST, but Redriver implementation would depends on the signal trace length.  Now for my customer the type-c 4:6 MUX is embedded within the PD controller, and the signal trace length is too long that they need a redriver for both DP and USB3 signal.  So, based on your reply, there should be no different guideline if TUSB1044 is placed "between type-c connector and PD controller(with 4:6 mux embedded)" or "between type-c connector and CPU(with 4:6 mux embedded)", right?

    Thanks!

    Antony

  • 0 in reply to Antony Lin
    TI__Mastermind 32881 points

    Hello Antony,

    You are correct, redriver implementation depends on signal trace length. There is a slight difference in configuration between implementing the TUSB1044 between the type c connector and PD controller with 4:6 mux and the type c connector and CPU with 4:6 mux, as you would have to account for the loss through the PD controller or the loss through the CPU, and may have to increase your EQ based on the differences. But there are no major differences in putting the TUSB1044 between the connector and the PD controller and the connector and the CPU.

    Best,
    Gerasimos