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TUSB9261 connection to TPS256

Thomas Carrington
Prodigy 50 points
Other Parts Discussed in Thread: TUSB9261, TPS2561, TPS2560

Hello,

I'm going to be implementing a single USB connection to 4 SATA devices (using the a single USB to 4 hub, and then 4x TUSB9261), please note that this will be for USB2.0, not 3.0 (which I believe I can still use the TUSB9261, as this still has compatibility to USB2.0 Highspeed.

When reading the implementation pdf, the TUSB9261 is connected to a TPS2561, and that this is enabled via GPIO10. Correct me if i'm wrong but isn't GPIO10 initially undefined with default firmware. Does this mean that when implementing the TUSB9261, I'll need to update the firmware? If so how do I do this?

Additionally, when using multiple SATA devices, will each SATA connection require 1 TPS2561, or can this be connected to 2 SATA connections?

Regards,

  Thomas

  • 0
    TI__Guru* 76130 points
    Hello,
    The tPS2560 is a dual power switch so it can control up to two SATA connections.
    The TUSB9261 requires an external SPI EEPROM in order to load the firmware, when the firmware needs to be updated you can use the TUSB9261 USB connection to do that, we have a windows-based too to do that, it is available at the below link.

    I will investigate whether the GPIO10 is used as a power switch enable pin by default.
    Regards

    www.ti.com/.../sllc414
  • 0 in reply to Elias Villegas M.
    TI__Guru* 76130 points
    Hello,
    The power switches are only required if the SATA drive is going to be bus-powered, GPIO10 is indeed undefined.
    Is your implementation bus-powered?
    Regards
  • 0 in reply to Elias Villegas M.
    Prodigy 50 points
    Elias,
    Thanks for the response, my implementation will be self powered from 12V. Does that mean that I leave the TPS on? If so do I simply drive the enable pin high?
    Additionally, if I don't require firmware updates; since the default firmware is compatible to USB2.0, do I really need the memory per TUSB?

    And final question, when powering multiple SATA devices, is it recommended to use multiple power regulators, I.e. a set of voltage regulators per device, or one "big" set of regulators for all devices?
  • 0 in reply to Thomas Carrington
    Prodigy 50 points
    Hello Elias,
    Is there any update on my above query?
  • 0 in reply to Thomas Carrington
    TI__Guru* 76130 points
    Hello,
    You don't need the TPS if you will be providing power by another means, In my opinion the TPS is a very handy device for power delivering, you could leave the TPS always On.

    The EEPROM is required even when no firmware updates are, the TUSB9261 will load the firmware from the EERPOM every time it is power cycled.

    Regarding the power regulators, that question is beyond my bandwidth, I recommend you to post a question on the Linear Regulators E2E.

    Regards