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TUSB1046A-DCI: ac-coupling caps are needed or not to support both USB3.1(Gen2) and DIsplayport

Kazuhiko Hirano
Genius 15038 points
Part Number: TUSB1046A-DCI

Hello,

My customer would like to connect TUSB1046A-DCI to either USB3.1(Gen2) or displayport via USB typ-C cable. Depending on whether the TypC cable is connected to USB3.1(Gen2) device or displayport device, RX1P/N and RX2P/N pins would be either Tx or Rx. In this case, should RX1P/N and RX2P/N pins have ac-coupling caps like TX1P/N and TX2P/N pins in the Figure 28 of the datasheet?

Best regards,

K.Hirano

  • +1
    TI__Prodigy 560 points

    Hello,

    For connecting a DisplayPort sink over Type-C, AC coupling capacitors are not required on these pins because the DP Alt Mode over Type-C spec for cables bridging USB type-C to DP is to include coupling capacitors internally.

    But coupling capacitors can be added on the RX side optionally for ESD protection per the USB ECN - see the attached document for more information. Please note if they are included, the value must be 330nF to meet the minimum required total series capacitance.

    0726.USB 3.1 ECN Rx AC Coupling Capacitor Option.pdf

    Regards,
    Alex