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Original question:

TUSB9261: TUSB9261 with USB 2.0

TUSB9261: TUSB9261 questions

albgarc2014
Genius 3520 points
Part Number: TUSB9261
Other Parts Discussed in Thread: TIDA-00882

Hi TI, 

I am developing a USB 2.0 - SATA adapter with the TUSB9261.


Please, I have the following questions:


1-) What voltage should be on pin 50 (USB_VBUS) (see attached design)?


2-) For a 2.5 inch hard disk is 12V power supply necessary on the SATA connector (see attached design)?


3-) The resistors R5 and R6 with 10 ohm, 1%, 100 mW, 0603 is ok (see attached design)?


4-) Please could you check the attached schematic to evaluate if there is any error? All suggestions are welcome.

Sincerely, thank you very much.

Best Regards

 USB-SATA.pdf

  • +1
    TI__Guru 60870 points

    Hello,

    1. You can use a 3.3V signal to drive USB_VBUS if you adjust the resistor divider values like you have done.  Please note that this is a detection input for the device and should not be high unless an upstream host or hub is connected.

    2. No, most 2.5" drives do not require 12V.

    3. Does your SATA drive support PWDIS on these pins, do you need the 10 ohm resistor option?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Genius 3520 points

    Thank you very much for the quick response.

    About the 10 ohm resistors:

    I will use a 2.5" hard disk. The 10 ohm resistors are set in the reference design of the TUSB9261 (TIDA-00882: USB TYPE-C HDD WITH USB POWER DELIVERY). That's why I put them in my design, but I have doubts with them.

    Can I remove the 10 ohm resistors?
    If not, what power should they support?

    Sincerely thank you very much.

    Best Regards

  • +1 in reply to albgarc2014
    TI__Guru 60870 points

    That reference design has larger power resistors (see below).  If you put them in your design I would recommend a similar size.

    RES, 10, 5%, 1/8W, 0805

    I did some research on why those resistors are even in the design and it appears that they are there to support pre-charge on those power rails, to reduce in-rush current.

    Regards,

    JMMN

  • 0 in reply to JMMN
    Genius 3520 points

    Sincerely, Thank you very much.

    Best Regards.