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Short to VBUS protection for USB Type C TX/RX pins

Kei Kuwahara
Expert 5350 points
Other Parts Discussed in Thread: TPD6S300A

Hello Team,

There are some short to VBUS protection devices for CC and SBU pins such as TPD6S300A.

However, I am confused why there is no OVP protection devices for TX/RX pins although they are placed next to VBUS pins.

I believe it is because the IO capacitance is going to be too big for such high speed communication line, but what would happen if VBUS is shorted to TX/RX pins?

Best Regards,

Kei Kuwahara

  • +1
    TI__Genius 14300 points

    Hi Kei,

    You are corerct, the short to Vbus devices don't have low enough capcaitance to support the high data rate of the Tx/Rx pins.

    If Vbus was shorted to one of the Tx/Rx pins the USB controller downstream could be damaged. You must determine if the downstream USB IC can handle this short. 

    You could use external esd protection on the Tx/Rx pins to clamp during the short to vbus, however this will only work for overvoltages with a duration below a few ms. Otherwise the diode would burn up since they're designed to clamp ESD/Surge events with pulse widths in the us range. 

    Regards,

    Sebastian