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TUSB9261: Question about TUSB9261

Jimmy Huang
Genius 3785 points

Part Number: TUSB9261

Hello:

TUSB9261 chip, VBUS voltage input is 5V. According to the following diagram, the USB voltage signal is divided, but the USB signal cannot be recognized at all. After removing R7 and replacing R6 with 0, the USB can be recognized normally, and the USB to SATA function is also normal;  
But according to the manual, the voltage range of VBUS is only 0-1.155V. Can the USB_VBUS pin be directly connected to 5V? How can it work normally if it is directly connected to 5V?

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  • 0
    TI__Mastermind 45930 points

    Hi Jimmy,

    Like you indicated, the range should only be up to 1.155V, so the device should be damaged by the 5V input.

    Could you monitor the USB_VBUS pin at the input and at R6 to confirm that the voltage is 5V at R6, and being lowered as intended? I would not recommend directly connecting to 5V to this pin, as we cannot guarantee proper functionality.

    5V is being supplied by the connected USB cable, correct? Can this also be tested with an EVM?

    Thanks,

    Ryan

  • 0 in reply to Ryan Kitto
    TI__Mastermind 45930 points

    Hello,

    Closing thread due to inactivity. If you have any follow-up questions or concerns, feel free to reply.

    Thanks,

    Ryan