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TUSB211A: TUSB211A Schematic and Layout

CHANG FUCHIEH
Prodigy 10 points

Part Number: TUSB211A
Other Parts Discussed in Thread: TUSB211

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Hello Support Team,

We are currently reviewing the schematic design using this device and would like to confirm a few implementation details.

  1. D1 / D2 Net Connection
    In our design, pins D1 and D2 are connected together by shorting the net names.
    Could you please confirm whether shorting D1 and D2 together is the correct and recommended implementation?

  2. Reserved Pin External Capacitor
    For the reserved pin, is it recommended to connect an external capacitor?
    If so, could you please advise the suggested capacitance value and any additional guidelines (e.g., placement or connection requirements)?

  3. Layout of D1 / D2 Short Underneath the IC
    Regarding PCB layout, we followed the layout example shown in the datasheet (Figure 8‑15, DP and DM Routing Underneath Device Package).
    In our design, D1 and D2 are shorted together and routed directly underneath the IC package, as illustrated in the reference figure.

    Could you please confirm whether this routing approach is correct

  • 0
    TI__Guru 51975 points

    Hello,

    CHANG FUCHIEH said:
    D1 / D2 Net Connection
    In our design, pins D1 and D2 are connected together by shorting the net names.
    Could you please confirm whether shorting D1 and D2 together is the correct and recommended implementation?

    Correct, DP/DM must be shorted beneath the redriver through DP 1/2 and DM 1/2. Giving these pins the same net names helps to indicate that.

    CHANG FUCHIEH said:
    Reserved Pin External Capacitor
    For the reserved pin, is it recommended to connect an external capacitor?
    If so, could you please advise the suggested capacitance value and any additional guidelines (e.g., placement or connection requirements)?

    An external capacitor is only required if being used to replace the TUSB211 in a design. If P2P functionality with the TUSB211 is not a concern, this pin can be left floating.

    CHANG FUCHIEH said:
    Layout of D1 / D2 Short Underneath the IC
    Regarding PCB layout, we followed the layout example shown in the datasheet (Figure 8‑15, DP and DM Routing Underneath Device Package).
    In our design, D1 and D2 are shorted together and routed directly underneath the IC package, as illustrated in the reference figure.

    Sounds good, DP/DM should be routed as figure 8-15 indicates.

    Thanks,

    Ryan