• State
  • Locked Locked
  • Replies 4 replies
  • Subscribers 62 subscribers
  • Views 89 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS25751: Questions about setting USB data configuration

Matt Crane
Prodigy 10 points
Part Number: TPS25751

Tool/software:

I am looking to design two similar boards using the TPS25751, shown below.

I have read through the datasheet of the IC, and I think I understand how the wiring works for the power etc, but I am still a bit unsure as to how setting up the USB data communications would work.

The first board is the simpler of the two. It needs to take in 5V 3A from a wall power supply to charge an iPad, and have a headset connection for the iPad.

1. Am I able to just connect the USB audio device's D+/D- lines to the port going to the iPad (USB-C Female #2)?

2: In this scenario I am not using USB-C PD, just 5V 3A, is there a more basic IC that can accomplish what I am trying to do here (Power: Source, Data: UFP)?

Looking on the TI website, it seemed like there were only PD chips that could act as a Source while being a UFP.

The second board is similar to the first, but the iPad is powered from a 12V barrel jack, and it also needs the option to connect the iPad to a PC for file transfer etc.

I figured this might be possible by using a USB 2.0 Multiplexer, where the iPad could swap between connecting to the PC and the USB Audio IC via a physical switch on the board, or an MCU GPIO.

3: Is it feasible to swap what the iPad is connected to, changing USB-C Female #2 between being a UFP for the USB Audio IC and a DFP for the Computer? If so, how? Would the MCU send data to the PD controller, or control its GPIO to accomplish this?

Let me know if there is any other info I can provide for clarification.

Thanks,
Matt

  • 0
    TI__Genius 17452 points

    Hi Matt, 

    Thank you for reaching out!

    I will review the block diagrams and provide feedback by early next week. 

    Best Regards, 

    Aya Khedr

  • 0 in reply to Aya Khedr
    Prodigy 10 points

    Thank you Aya! Looking forward to hearing your feedback.

    Have a nice weekend,
    Matt

  • 0 in reply to Matt Crane
    TI__Genius 17452 points

    Hi Matt, 

    Thank you for your patience. 

    I am reviewing and will get back to you by tomorrow. 

    Best Regards, 

    Aya Khedr 

  • 0 in reply to Aya Khedr
    TI__Genius 17452 points

    Hi Matt, 

    Thank you for your patience. See my comments below:

    First Board: 

    • What is the source power requirement (voltage and current)?
    • The TPS25730 is a sink-only PD controller that is typically used in barrel-jack replacement applications. This could be used along with USB-C #1. 
    • Also, please note that a 3.3V supply is needed to power the PD controller. I am not sure what the power requirement is for the MCU, but the same 3.3V rail can be used to power the MCU as well. 
      • Matt Crane said:
        1. Am I able to just connect the USB audio device's D+/D- lines to the port going to the iPad (USB-C Female #2)?
      Yes, that should be fine. 
      • Matt Crane said:

        2: In this scenario I am not using USB-C PD, just 5V 3A, is there a more basic IC that can accomplish what I am trying to do here (Power: Source, Data: UFP)?

      For Type-C only (non-PD), the source data role is DFP and the sink's data role is UFP. For a Source DFP, a PD controller is required. The TPS25751 is a good fit here!

    Second Board:

    • What is the source power requirement (voltage and current)? 
      • Matt Crane said:
        Is it feasible to swap what the iPad is connected to, changing USB-C Female #2 between being a UFP for the USB Audio IC and a DFP for the Computer? If so, how? Would the MCU send data to the PD controller, or control its GPIO to accomplish this?

      The TPS25751 is for a single-port only. We have dual-port PD controllers that may meet your application better here. See the TPS65988DK.

      In general, PD controller can be DRD (Dual Role Data), and swap from UFP/DFP.

    Best Regards, 

    Aya Khedr