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TUSB213: TUSB213 EQ and BOOST setting

Henry Wang
Intellectual 700 points
Part Number: TUSB213

Hi Sirs,

I saw the user guide of TUSB213 Evaluation Module and confused the EQ and Boost Setting on document.

There used same setting value on long cable for 1~2m and 2~3m, is it correct?

Regards,

Henry.

  • 0
    TI__Mastermind 36085 points
    Hi Henry,

    That is correct, since the adjustment should be enough to compensate the loss. but please notice that the table is an example and guideline to compensate the cable loss and the customer must perform an electrical test in order to find the right settings for the implementation, this is mainly because each cable/Boards varies on its loss profile, also the USB interfaces (Host or device) may have different TX and RX characteristics which have to be taken into account.

    Regards,
    Diego.
  • 0 in reply to Diego Cortes
    Intellectual 700 points
    Hi Diego,

    Thank you for your detailed and clear explanation.


    Regards,

    Henry.
  • 0 in reply to Henry Wang
    Prodigy 40 points

    Hi,

    we have some question about the application of TUSB213.
    The below is our schematic

    1. DC boost voltage


    We choose RDC1=47kohm and RDC2=24.3kohm.
    but the voltage of DCboost is 40mV, not 3.3V.
    If we remove RDC1 and RDC2, let it float,
    the voltage will be 3.3V.
    the result let us feel confuse.

    2. EQ


    we choose 3.9kohm for REQ.
    How to verify if we get the correct setting?
    by measuring voltage of current?

    In spec, we can see that.
    " Auto selects maximum AC boost level when left floating"

    If we need longer USB cable (2M-3M), we should give a fixed value or let it floating?

    Thanks.

    Best regards,

  • 0 in reply to CHE HAO CHANG
    Prodigy 40 points

    add reference photo.

    schematic

    DC boost

    EQ