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TUSB320LI: VDD is power with 3.3V, ID is pullup to 3.3V. CC connected to 5V possible?

Michael kliem
Prodigy 30 points
Part Number: TUSB320LI
Other Parts Discussed in Thread: TUSB320

Tool/software:

Hello,

My application to to source 5Volt on vbus without having a (sink)peripheral plug in.

I would like to add a pullup resistor on CC1 and/or CC2 and use 5volts. The resistor will make connection to Vbus which is 5volts. 

I will do this through the cable.

The specification indicate I can go to 6Vmax on this CC line.   Is this correct?

  • 0
    TI__Mastermind 30120 points

    Hi,

    Thanks for reaching out. Are you using the TUSB320LI as the DFP or UFP in this application?

    Can you show a block diagram of the system so I have a better understanding?

    Best,

    Shane

  • +1 in reply to Shane Hauser
    Prodigy 30 points

    Right now the TUSB320 port is NC. Dual role.  My goal is to output 5V on the USB-A side. 

  • 0 in reply to Michael kliem
    TI__Mastermind 30120 points

    Hi Michael,

    I have a few comments on your diagram:

    1. You cannot have the 5V VBUS constantly supplied to the OTG connector. The VBUS needs to be enabled/disabled by the ID pin on the TUSB320LI. Please see this resource for more info on controlling the type-C VBUS.

    2. If you want to source 5V from the OTG connector, then you need to present the USB-C to A device as a UFP. To do this, you need to install pulldown resistors on both CC lines in your USB-C to USB-A board. When the TUSB320 senses these pulldown resistors, it will configure as a DFP and provide VBUS on the type-C port.

    Michael kliem said:
    The specification indicate I can go to 6Vmax on this CC line.   Is this correct?

    6V is the absolute maximum rating in our datasheet for the CC1/2 lines. CC1 and CC2 should typically hold around 5V for the presenting DFP/DRP when nothing is attached.

    I hope this helps. Let me know if you have any questions.

    Best,

    Shane