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TUSB320: ID Pin fumction

Shu-Cheng LIN
Guru 11785 points
Part Number: TUSB320

Hi Sirs,

Sorry to bother you 

1. We saw ID are pull high in reference design, the state should be on Device mode. We  hope there are on Host mode when power on,

So how could we connect ID?  

2. The CPU USB ID only have 3.3v, have any risk if ID PU to 3.3v?

  • 0
    TI__Guru 64326 points
    Hi,

    1. ID does not configure TUSB320 in device mode (UFP) or host mode (DFP). The pin that controls this is the PORT pin. For DFP pull PORT to VDD. NOTE: ID is an output that indicates when a DFP or DRP has been connected.

    2. Since ID is open drain pull up to 3.3V should be okay.
  • 0
    TI__Guru**** 166351 points
    Shu-Cheng

    The ID pin is open drain output and requires an external pullup resistor. Depends on CC1/2 connection, it will be driven low.

    Since the ID pin is a non-safe IO, it is recommended to pull the ID pin to the device VDD supply to minimize the potential damage coming from back-drive when VDD is off.

    Thanks
    David
  • 0
    TI__Guru**** 166351 points
    Shu-Cheng

    The ID pin is open drain output and requires an external pullup resistor. Depends on CC1/2 connection, it will be driven low.

    Since the ID pin is a non-safe IO, it is recommended to pull the ID pin to the device VDD supply to minimize the potential damage coming from back-drive when VDD is off.

    Thanks
    David