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TUSB2046B: TUSB2046BIRHBR reset pin

Lucas Uecker
Prodigy 110 points

Part Number: TUSB2046B

Hello-

I've added a TUSB2046BIRHBR to a SoC design, but tied the reset pin to 3.3v. We have not been able to communicate with devices attached downstream and this seems to be the most likely culprit as it is the only significant deviation from the reference design. I've modified the prototype with a pullup resistor and manual switch to toggle the reset signal, but is there a better way to improvise the correct reset delay for testing? Would a supervisor/reset timer be recommended in the future? 

Thanks

  • 0
    TI__Guru 60870 points

    Hi Lucas,

    You can use a reset timer, but it may be easier and cheaper to just to use a RC circuit, with a pullup resistor and a cap to ground.  15K pullup / 0.1uF capacitor.  You may need to adjust the pullup value if you have a very slow or very fast 3.3V rise time, but that's a good starting value.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 110 points

    Hi JMMN. Looks like that did the trick with the reset, but that my problem seems to lay elsewhere...

    Thanks!