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TUSB3410: Two questions

Shu-Cheng LIN
Guru 11785 points

Part Number: TUSB3410

Hi Sirs,

Sorry to bother you.

After study Ref board, we have two question.

1. Why need to add R and C on D+ and D-? what is the R and C function?

2. On power Pin, are there any suggested placement and recommended Cap value for Layout design?

 

  • 0
    TI__Mastermind 33723 points

    Hello,

    First, R4 and R5 serve to help with ESD, and dissipate enough power for the internal ESD diodes in the 3410 to take care of the rest. The capacitors are used for edge rate control.

    Section 6.2.2.4 in the datasheet gives you recommended capacitor values of TUSB3410. The placement, as with most capacitances on power should be as close as possible to the power pins of the device.

    Best,
    Gerasimos