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TUSB319-Q1: Should ID Pin be used?

Adithya Anil
Prodigy 150 points
Part Number: TUSB319-Q1
Other Parts Discussed in Thread: TUSB8041-Q1

Tool/software:

Hi,

Should ID Pin of the chip TUSB319-Q1 be mandatorily used?

I am using a USB Hub controller TUSB8041-Q1, CC Controller TUSB319-Q1 and a power switch as well in my design. So, should I connect the ID pin of TUSB319-Q1 to EN pin of VBUS Power switch or should I connect the PWREN pin of USB Hub controller to the EN pin of VBUS Power switch?

I also need to use the overcurrent alert from the power switch to the OVERCUR1z pin of USB Hub controller.

Regards,
Adithya

  • 0
    TI__Mastermind 38835 points

    Hi Adithya,

    Yes, the ID pin should be used to control VBUS. VBUS is used as part of the CC negotiation that takes place over the CC lines, so if it is not controlled properly by the ID pin, then the type-C connection might only work in one flip orientation, or USB3 won't work at all.

    We recommend connecting the ID pin to a VBUS/Power switch and not to the hub, as the ID pin is pulled low when it indicates VBUS needs to be sent, and the hub EN pin is active high. Connecting ID to a power switch that enables when ID is low would be easier I believe.

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    Prodigy 150 points

    Hi Ryan,

    I am still confused. There is a Power On Control for Downstream Power Enable which is a pin PWRCTL1/BATEN1 for the Hub Controller IC TUSB8041-Q1. Also, there is an ID pin which is asserted low when the CC pins detect device attachment for CC Controller TUSB319-Q1. I am using both these ICs on my board. So, I wanted to know which pin PWRCTL1/BATEN1 of the Hub or ID of the CC Controller should be connected to the EN pin of Power Switch. 

    I also want to connect the ALERT pin from the Power switch to the OVERCUR1z pin of USB Hub controller so that it detects overcurrent if any. So, I am not sure if I will have to mandatorily connect PWRCTL1/BATEN1 of the Hub Controller IC TUSB8041-Q1 to the EN pin of Power Switch. 

    Regards,
    Adithya

  • 0 in reply to Adithya Anil
    TI__Mastermind 38835 points

    Hi Adithya,

    Adithya Anil said:
    I am still confused. There is a Power On Control for Downstream Power Enable which is a pin PWRCTL1/BATEN1 for the Hub Controller IC TUSB8041-Q1. Also, there is an ID pin which is asserted low when the CC pins detect device attachment for CC Controller TUSB319-Q1. I am using both these ICs on my board. So, I wanted to know which pin PWRCTL1/BATEN1 of the Hub or ID of the CC Controller should be connected to the EN pin of Power Switch. 

    I would recommend using the ID pin over the PWRCTL1 pin. If VBUS is not controlled via ID, it will likely negatively affect type-C functionality.

    Adithya Anil said:
    I also want to connect the ALERT pin from the Power switch to the OVERCUR1z pin of USB Hub controller so that it detects overcurrent if any. So, I am not sure if I will have to mandatorily connect PWRCTL1/BATEN1 of the Hub Controller IC TUSB8041-Q1 to the EN pin of Power Switch. 

    If you want to use the ALERT/Overcurrent functionality while using the ID pin of the TUSB319-Q1 as the enable for the power switch, it may be best to use something like an AND gate or something similar on the EN pin. You would need to use a gate that would follow the output of the ID pin, while disabling the EN pin of power switch in the case that an overcurrent was detected.

    Thanks,

    Ryan