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TUSB212: How to detect and compensate USB HS signals

user6425964
Prodigy 20 points
Part Number: TUSB212

Hello teams,

It was written in the data sheet that TUSB212 pins D1M and D2M, and D1P and D2P are recommended to connect as shown in Layout Example, respectively. If the metal wires are connected as in the Layout Example, I think that the USB differential signals (DP and DM) will pass through without passing through the TUSB212 IC. If possible, please tell me why this IC can detect the USB high speed(HS) signal and compensate for the HS signal.

Thanks.

  • 0
    TI__Guru 64326 points

    Hi,

    That is correct the DP and DM should be shorted underneath the device. TUSB212 uses proprietary methods to provide signal compensation in this scenario. TUSB212 will detect the USB 2 HS data and provide signal compensation accordingly. 

  • 0 in reply to Malik Barton57
    Prodigy 20 points

    Thanks for your reply.
    Is it difficult to get more information about USB 2 HS signal detection and signal compensation methods?

  • 0
    TI__Guru 64326 points

    Hi,

    I can say that the signal compensation or boosting provided by TUSB212 is activated when USB 2 HS enumeration is seen on the bus. TUSB212 has two type of compensation AC and DC boost. AC boost compensates for the capacitive losses in traces and cables while DC boost compensates for IR losses primarily found in long USB2 cables. Does this answer your question?

  • 0 in reply to Malik Barton57
    Prodigy 20 points

    Thank you for explaining AC and DC boost of the TUSB212.
    I would like to know the following two points.

    1. How does the TUSB212 detect the USB2 HS signals?

    2. What method is used to provide the signal compensation AC boost and DC boost?

    The DP and DM of the TUSB212 are shorted underneath the device. Since the signal can be passed through without passing the signal through the IC, I would like to know the principle of why the TUSB212 can perform the above two operations.

  • 0 in reply to user6425964
    TI__Guru 64326 points

    Hi,

    1. TUSB212 will detect the UB 2 HS enumeration process and once enumeration has complete will enable boosting. TUSB212 monitors the bus even though TUSB212 is in parallel to the USB 2 bus. 

    2. TUSB212 AC boost will be applied to the transition bits where most high frequency loss is concentrated. DC Boost will be applied to the non transition bit where IR losses are concentrated. 

    I cannot provide too many details here due to NDA restriction.

  • 0 in reply to Malik Barton57
    Prodigy 20 points

    Thanks for your information.
    I understand that it is difficult to get more information due to NDA restrictions.