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TUSB320LAI: TUSB320LAI

Ali Ganjidoost
Prodigy 10 points

Part Number: TUSB320LAI
Other Parts Discussed in Thread: TUSB320, TUSB321AI

I am designing a board that is powered ON 5V, 3A so i want to use usbC connector for 5V, 3A power in. 

So my application is UFP.

how i can configure TUSB320 for permanant UFP in 3A, 5V?

  • 0
    TI__Guru 64326 points

    Hi,

    TUSB320 in UFP will only present Rd for the DFP to provide VBUS. It is up to the connected DFP to provide 3A over VBUS. OUT1 and OUT 2 pins can be monitored to understand what is provided from connected DFP.  

  • 0 in reply to Malik Barton57
    Prodigy 10 points

      

    as shown in TUSB320 datasheet, you can set the requested current (for example 3A) through I2C. right?

    i need to do this without I2C , if possible.

    How DFP knows i need 0.9A or 1.5A or 3A?

  • 0 in reply to Ali Ganjidoost
    TI__Guru 64326 points

    For TUSB320 this feature can only be done through I2C and sets the advertised current in DFP mode. TUSB321AI has a input pin where the advertised current mode can be set via resistor network. 

    Keep in mind this only refers to DFP mode operation. If your design is intended to sink power over VBUS (not source) then the CC controller should be set to UFP mode and it is up to the DFP to advertise and provide the appropriate amount of current capacity. 

  • +1 in reply to Malik Barton57
    Prodigy 10 points

    thanks for reply. yes my design is always in sink (UFP) and i need 3A always. if DFP has different current rating. How he knows i need 3A?

  • +1 in reply to Ali Ganjidoost
    TI__Guru 64326 points

    Unfortunately the DFP will not know when using a CC controller. You will need t use a PD controller to have more "negotiation". However is both cases the VBUS power is controlled by the DFP or source capabilities. 

    Just a thought but using TUSB321AI OUT pins can inform the system of the current level provided and perhaps inform the user of inadequate power via LED or some other output?