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TUSB1142: Review about TUSB1142

Alex-Cosmin Anghelina
Prodigy 30 points
Part Number: TUSB1142
Other Parts Discussed in Thread: TUSB321

Hello,

I used a TUSB1142 to redrive USB 3.2 signals that are coming from another board from a board-to-board connector to a USB Type-C connector.

There are no series capacitors on TX/RX lines on the other board.

TX from another board is connected to TX of TUSB1142, RX signals too.

All layout constrains are extracted from DS and are written on the bottom left corner.

Please take into consideration series capacitors, decoupling power supply capacitors, TX/RX connections, if the IC requires a reset circuitry, configuration pins recommendations, FLIP logic, layout constrains or any other things that I may not be taken into consideration.

 

Thank you!

Have a great day!

Alex

  • +1
    TI__Mastermind 30220 points

    Hi Alex,

    Your series capacitors look ok.

    I see you are pulling down the SLP_S0# pin

    This would disable RX detect functionality, and may prevent the 1142 from entering active mode. I would pull SLP_S0# up instead. Here is a better explanation for what SLP_S0# does from the datasheet:

    Since you have the PORT pin floating on the TUSB321 you are using DRP mode and would want to be sure something is controlling the USB VBUS. 

    This is generally done using the ID pin on the 321, combined with a VBUS switch. When the 321 is a DFP the switch would apply VBUS, and when acting as a UFP, the switch would not apply VBUS.

    From your schematic, the ID pin seems to connect with an MCU. I assume your MCU will control whether VBUS is applied or not, which is ok. If this is your implementation then it looks good.

    Best,

    Shane

  • +1
    TI__Mastermind 30220 points

    Another suggestion I have is to change the size of your series capacitors from 402 to 201. A size 402 capacitor may cause signal reflections in the TX/RX traces as it would be much larger than the trace it is placed on.

    In general it is better to fit the size of the capacitor to the size of the trace it is placed on.

    Best,

    Shane