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TUSB321AI: Please review the schematic

Chase Jeong
Mastermind 7445 points
Part Number: TUSB321AI
Other Parts Discussed in Thread: TUSB1044, TUSB321, TUSB1044RNQEVM

Hello TI experts,

My customer considers TUSB321AI while using TUSB1044.

actually I asked about TUSB1044, and another expert said that I have to use TUSB321 to control CC and FLIP pins of TUSB1044.

so my customer added TUSB321AI to their product, and I want you to ask reviewing this schematic.

(please review the schematic especially focused on the connection of CC pins and Flip pin.)

schematic_002.pdf

and here is other questions;

1. EVM said that the pull-up resistor of OUT1, OUT2, ID pins are 200K. (R17, R18, R42). I think this value is too large. care these values right? (usually we use under 10K as pull-up.)

2. should I use inverting buffer between FLIP pin of TUSB1044 and DIR pin of TUSB321AI? or can we use it without inverting?

Please check these issues. Thanks.

Best regards,

Chase

  • 0
    TI__Guru 64326 points

    Hi,
    Your issue is being assigned to the appropriate engineer. Due to the US Holiday there may be a delay in response to your post. We apologize for any inconvenience.

  • 0 in reply to Malik Barton57
    Mastermind 7445 points

    Dear Malik,

    Thank you for your reply. Please let me know if there are any updates about this.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    Hi Chase,

    Your design has two Type-C receptacles without using two separate CC/PD controllers. This mean that the Target Side USB-C CC pins will need some Rp pull-up resistors on the CC pins or another CC/PD controller. Without proper termination on the CC pins (Target side) no connection will be made. 

    • VBUS_DET should not be pulled up to T_VBUS net. It should be pulled up to H_VBUS.
    • TUSB321AI should be used in UFP mode , PORT pin pulled down. Since TUSB321AI is connected to the host side connector. 
    • 200K is the official TI recommendation but 10k should work as well since this pin is an open drain output.
    • No inverter necessary between DIR and FLIP pins. Position 2 is the flipped condition.  
  • 0 in reply to Malik Barton57
    Mastermind 7445 points

    Dear Malik,

    Thank you for your reply.

    It seems like that I need 2 CC controllers on both sides because I use 2 same receptacles.

    let me ask you in another way

    1. don't I need to use any CC controller if I use 1 plug and 1 receptacle like TUSB1044RNQEVM?

    (cc1 and cc2 pins are directly connected through ESD protector in EVM schematic.)

    2. like I said the customer will use it only for USB drive. then can we set control pins on TUSB1044 using jumper switch?

    (cause you said that I have to use CC controller to control FLIP pin.)

    Please check these issues. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Guru 64326 points

    Hi Chase, 

    Using two CC controller would be the best.

    1. If you use one USB-C plug then you will not run into the same issues and can use a design like the TUSB1044RNQEVM.

    2. In the case of the EVM the thought is that for most cases the EVM will also be flipped with connected device to match plug orientation, so no CC Controller DIR signal is needed. FLIP can also be controller from jumper setting but in same cases the lane order may not match the physical connection and setting will have to be configured manually. (i.e. design is not autonomous).