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TPS65982: TPS65982 for two ports application questions:

John Liu59
Intellectual 2735 points
Part Number: TPS65982
Other Parts Discussed in Thread: TPS65981, TPS25820, TPS25810

Dear,

 

My customer  is evaluating a project for  notebook, they want to use 2*TPS65982 in their two type-C ports.

Two ports have different functions, one can support Thunderbolt, DP, Audio while the other don’t have those function.

 

Here are some questions  want to clarify:

  1. Since ROM is required in this application, for those two TPS65982, different functions are implemented, can they share one ROM? Besides, do we have any reference design for the two ports TPS65982?

  2. For the USB D+/- MUX, does it have redriver or conditioner function? Since the long line trace on the PCB, they are worried about the signal attenuation of D+/D-; Any suggestion for the long trace of D+/D-?

  3. For GPIO5~8， if not used, datasheet suggested connect to ground with 1Mohm resistor, can those resistors removed?

 

Thanks.

  • 0
    TI__Expert 4415 points

    Hi John,

    Here are my answers for the three questions:

    1. Do you mean SPI-flash instead of ROM? If you have two TPS65982 on the same PCB, they can share the SPI Flash, just connect the UART lines from the Primary ’82 to the secondary. (The Primary is the one connected to the SPI Flash). Unfortunately, we do not have a two port reference design, only single port reference designs. I recommend taking a look at the user’s guide for reference.

    2. Unfortunately, the TPS65981/2/6  doesn’t have redriver or conditioner function circuit. If the customer is worried about the signal attenuation, I would recommend to add a redriver device.

    3. Unfortunately no, resistors cannot be removed. We suggest ground with a 1Mohm resistor.

    I hope this helps and If this answers your question, PLEASE select  This resolved my issue 

     

    Best Regards,

    Hao

  • 0 in reply to Hao Wang14
    TI__Intellectual 2735 points
    Hi Hao,

    Thanks for your reply.
    I wonder do we have reference design for the type C application without considering the power delivery, they just want to use the data transition function. Could you please share with me?

    Thanks.
  • 0 in reply to John Liu59
    TI__Expert 4415 points

    Hi John,

     

    For Type-C controllers, I would recommend the TPS25810 for 3A and TPS25820 for 1.5A application. If the customer would like to use alternate mode (display port/thunderbolt), they would need a PD controller.  

    You can refer the EVM user’s guides for both type-c controllers mentioned, and/or the TI design using TPS25810 below:

    CISPR 25 Class 5 USB Type-C™ Port Reference Design with USB 3.0 Data Support

    If you have any questions about the TPS25810 or TPS25820 devices, please start a new post using these part numbers.  

     

    I hope this helps and If this answers your question, PLEASE select  This resolved my issue 

    Hao