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TUSB8040A1 unused pin

kyt
Expert 2355 points


I try to use USB port 0 and Port1 of downstreem port.

Unused terminal of USB Port2 and Port3  is need correct process.

So I have a question about  follow pin B20 and A22 .

B20: PWRON2z_BATEN2

A22:PWRON3z_BATEN3

Shuld it be pulled down or pulled down?

In D/S Table 2-4. USB Downstream Signals (continued),There is no description in case of unused pin.

http://www.ti.com/product/tusb8040a1

  • 0
    TI__Expert 4055 points

    Hello Kyt,

    You can leave does terminals unconnected since they have internal pull-down resistors. Just keep in my mind that those terminals are sampled at power on reset, so if the 3.3V power rail is not at an acceptable level there is a risk that the internal pull-down won't be active at that moment. However to assure acceptable values on power rails before power on reset is required per the datasheet.

    Best Regards,

    Alexis Cortes.