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TUSB320LAI: TUSB320LAI

Yunsheng Luo
Intellectual 2260 points
Part Number: TUSB320LAI
Other Parts Discussed in Thread: TUSB320,

Tool/software:

Hi, 

I noticed that CC1 pin connects the current source in the datasheet as the picture shown. I know that there are two CC models, pull-up/pull-down CC model and current source/pull-down CC model, as shown in picture.

Question:

1. What is the difference between these two models of operation?

2. From a design perspective, when to use the first and when to use the second? 

Thank you so much!

  • +1
    TI__Mastermind 30150 points

    Hi,

    The CC pins will be driven high in one mode of operation, and will be pulled low in the other. When the CC pins are driven high, this is DFP mode, where your Type-C port is supplying power. When the CC pins are pulled low, this is UFP mode, where your type-C port is receiving power. 

    When your port is configured for dual role port (DRP) mode, the CC pins will alternate between driving high and pulling low. This will be set based on the PORT pin

    1. The two modes of operation act the same way. In both cases, the UFP will see an attached DFP.

    2. Not sure what you mean here. The TUSB320 will handle DFP advertisement so you only need to set the PORT pin correctly.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    TI__Intellectual 2260 points

    I want to figure out the pros and cons of pull-up/pull-down CC model and current source/pull-down CC model.

  • 0 in reply to Shane Hauser
    TI__Intellectual 2260 points

    Hi Shane,

    I still wonder what the PP_HV means in the below picture.

    Thank you so much.

    Best,

    Thomas

  • +1 in reply to Yunsheng Luo
    TI__Mastermind 30150 points

    Hi Thomas,

    Yunsheng Luo said:
    I want to figure out the pros and cons of pull-up/pull-down CC model and current source/pull-down CC model.

    From my understanding there are no functional benefits of one CC model over the other. They should both operate the same way. A pro for the pullup/pulldown model could be that it is simple to implement (only needs a pullup resistor).

    Yunsheng Luo said:
    I still wonder what the PP_HV means in the below picture.

    That image looks like the power negotiation on a PD controller. My group only supports our CC controllers (TUSB320/321/322), so I am not familiar with PD power negotiation. I can refer this thread to the team that supports our PD controllers, or you can submit another E2E ticket with the appropriate PD controller as the device.

    If you have any questions on the TUSB320LAI, I'm happy to answer.

    Best,

    Shane

  • 0 in reply to Shane Hauser
    TI__Intellectual 2260 points

    Hi Shane,

    Thank you so much for answering my question.

    Best Regards,

    Thomas

  • 0 in reply to Shane Hauser
    TI__Intellectual 2260 points

    Hi Shane,

    I figure out that most products of TI are using current source/pull-down CC model. I think this will reduce the amount of resistance and space as much as possible, and thus save costs, am I right to understand that?

  • 0 in reply to Yunsheng Luo
    TI__Mastermind 30150 points

    Hi Thomas,

    This is really dependent on the implementation. If you can create a current source model that is cheaper/smaller then the pullup model, then the current source model may be the better option.

    Are you planning to use a CC or PD controller in the design? These will have the CC model integrated so you wouldn't need to create your own.

    Best,

    Shane