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TUSB542: extended distance

Kelly Wang
Intellectual 550 points
Part Number: TUSB542
Other Parts Discussed in Thread: TUSB544

If TUSB542 is used for extending USB3.0 signal distance, I am wondering whether it has problem. The application would be like

Computer USB C port --> standard USB3.1/3.2  C/C cable 2m--> USB C connector --> TUSB542 -->USB A connector--> standard USB 3.0 A/C cable 2m--> USB3.0 device.  

Also, would it be a problem to use TUSB542 this way?

Thank you.

Kelly

  • 0
    TI__Guru 64326 points

    Hi Kelly,

    This kind of application is know as an "active cable". TUSB542 can be used like this as long as there a CC controller to control the mux according to the plug orientation. To avoid additional connectors I recommend looking into TUSB544EVM which can be used for the kind of application at the end of the cable. 

     

  • 0 in reply to Malik Barton57
    Intellectual 550 points

    Malik,

    Thank you for your reply.  

    I am planning to evaluate TUSB544 demo board. I have a question regarding this demo board.  What is the maxim  length tested cable between host and upstream port P1 and cable between device and downstream port P2?

    Best Regards,

    Kelly

  • 0 in reply to Kelly Wang
    TI__Guru 64326 points

    Hi Kelly,

    Since this board has one receptacle and one plug, it is intended to work at either (or both) ends of the cable. Keep in mind Type-C cables are only have Type-C plus not receptacles. Max cable length tested is 1m with the EVM connected directly to test PC. Performance will vary with cable quality and gauge.   

  • 0 in reply to Malik Barton57
    Intellectual 550 points

    Malik,

    Most USB C cable are C male to C male.  I found one USB3.1 C male to C female cable from Digikey

     https://www.digikey.com/en/products/detail/switchcraft-inc/EHUSB31CFCM/10186806

    If I test TUSB544 demo board like below,

    Computer USB C port --> USB 3.1 C male to C female cable 1m long ( connects to USB C plug on demo board) --> TUSB544 demo board  --> USB 3.1 C male to C male cable 2m long (connects to USB C socket on demo board) --> USB device. 

    Will it be a problem?  And what is the best UEQ, DEQ, CTL, FLIP, etc GPIOs should be configured to? 

    I don't quite understand that the demo board says it run on external 5VDC only. VBUS on both C connectors are connected to the power rail. Which pin configuration can cut off the VBUS power from computer C port?  

    I am testing it to see whether TUSB544 can be USB 5Gbps cable extender.  

    Thank you very much.

    Kelly

  • 0 in reply to Kelly Wang
    TI__Guru 64326 points

    Hi Kelly,

    The setup looks good but performance will vary mainly based on cable quality/gauge and output signal quality from the PC. I recommend starting with eye diagram testing using the PC USB test pattern output of CP0 to find the best settings. To start you could simply set all EQ pins (UEQ and DEQ) to "F" or floating. As an example lets assume you are using a 28 AWG cable (both 1m and 2 m) then insertion loss will be about -2.1 dB/m*. In this case EQ settings should be UEQ[1:0] = [R,1] and DEQ[1:0] = [R,1]. 

    *Reference: Table 3-21 Differential Insertion Loss Examples for TX/RX with Twisted Pair Construction from Universal Serial Bus Type-C Cable and Connector Specification Release 2.0

    For DIR, CTL and FLIP settings refer to Table 4. INPUT to OUTPUT Mapping for the different options and pin mappings. For USB only operation the options marked below should be used.