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TS3USB3000: Load capacitance

Jim CHEN
Expert 4795 points
Part Number: TS3USB3000

Dear Team,

I have some questions about load capacitance in circuit design, could you please check with internal to clarify my doubts.

  1. As shown in the below figure, the D + / D- signal line should also have a load capacitance.

Can you provide us the breakdown value of load capacitance (CLD+/-, CLUSB+/-, and CLMHL+/- )in the following four modes?

 

2. Could you let me know how did you get these capacitance value in above parameter table?

Thank you.

  • 0
    TI__Mastermind 36085 points

    Hello Jim,

       The TS3USB3000 load capacitance was characterized on the USB/MHL side, as you can see in the image below.

    Regards,

    Diego.

  • 0 in reply to Diego Cortes
    TI__Expert 4795 points
    Hi Diego,

    Because the customer showed me competitor's solution. They have the load capacitance on USB/MHL and D+/-.
    So they want to know if we have this parameter on D+/- as well.

    Another question about the parameter table is, compare between switch on/off on MHL side, Con= 1.6 pF is larger than Coff=1.4 pF.
    But why the result is opposite to USB side? On USB side, Con=1.4 pF is smaller than C off= 1.6 pF.
    Could you help to clarify it?

    Thank you.
    Regards,
    Jim
  • 0 in reply to Jim CHEN
    TI__Expert 3655 points

    Each Con and Coff are measured at the corresponding pin.

    Typically Con is higher than Coff as they will be more parasitic but not always. We will need to go back and check why usb side coff is higher.