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USB high speed hub

Other Parts Discussed in Thread: TUSB2046B, TUSB8041, TUSB4041I

What offerings does TI have for high speed USB hubs?

There seems to be a gap between full-speed and super-speed (USB 3.0).

  • Hi Josh 

    In fact there's a gap but soon we will release HS USB Hubs, 2 & 4 ports.

    Currently we have samples for the TUSB4020B (2 port) and in September we will have TUSB4041 (4port) samples.

    RTM is still TBD.

    Best regards.

    JC

  • Hello,

    At the moment we use a TUSB2046B 4 port USB hub on Full speed. We need a High speed Hub. What is the roadmap for the TUSB4041?

    And will this device be compatible with TUSB2046BVF 32LQFP 

    Kind regards,

    JW

  • Hi Jeen,

    We are releasing to market the industrial and automotive version of the TUSB4041 on 2Q15, and it is P2P with TUSB8041 currently we don´t have on roadmap the commercial version.

    Regards.
    JC
  • Dear JC,

    I also need TUSB4041i for USB HUB2.0 but I could not find its reference schematic or EVM manual..

    Would you please let me know if you have?

    Thanks,

    eric

  • Hello,

    I'm also looking for some help about TUSB4041I. Is there some reference schematics now ?

    Regarding the quartz, we can see that Crystek is recommanded in the datasheet but when you look to the reference CC3391, it seems to be an oscillator and not a quartz. How can it be connected ?

    Thank you for your help,
  • Hello,

    I'd like to add another point: when you look in the Schematics of the Evaluation board, capacitors has been implemented on each 3.3V or 1.1V pins.
    Is it enough to put just a 100nF capacitor or do we need to implement 1nF, 10nF and 100nF as in the EVM ?
    Moreover, where can we put the 1uF and both 10uF in the layout ?

    Thank you for your help.
  • Hello,
    You will have better filtering using 1nF, 10nF, 100nF.
    Place the capacitors as close as possible to the power pins.
    Regards
  • Hello,

    Thank you for your reply.

    The reason why I asked this is that in the online datasheet, we can see 100nF capacitors recommendation as here:

    11 Layout

    11.1 Layout Guidelines

    Use the layout guidelines listed in this section for proper PCB layout design.

    11.1.1 Placement

    • Place a 9.53-kΩ ±1% resistor connected to pin USB_R1 as close as possible to the TUSB4041I device.
    • Place a 0.1-µF capacitor as close as possible on each VDD and VDD33 power pin.
    • The ESD and EMI protection devices (if used) should also be placed as close as possible to the USB connector.
    • If a crystal is used, it must be placed as close as possible to the XI and XO pins of the TUSB4041I device.
    • Place voltage regulators as far away as possible from the TUSB4041I device, the crystal, and the differential pairs.
    • In general, the user should place the large bulk capacitors associated with each power rail as close as possible to the voltage regulators.

    Is just 100nF enough for that TUSB4041 works fine ?

  • Yes, that should be good enough.
    Regards
  • Hello,

    I use a TUSB4041I connected to a Computer on Module.

    I have an issue with the usb hub which reboots permanently.

    From the COM, I can see that the TI driver installed seems to be wrong because it appears TUSB8041, which is USB 3.0 hub and not the USB 2.0, like following:

    Bus 002 Device 002: ID 0451:8142 Texas Instruments, Inc. TUSB8041 4-Port Hub

    It seems that the generic driver for TUSB4041 is TUSB8041, am I wrong ? Is it a problem ?

    Thank you for your help.

     

  • Hello,
    The TUSB4041I does not require any special driver, all of our hub are supported by the standard USB driver of the operating system.
    Try to uninstall the driver and let the OS automatically install the driver for the TUSB4041I.
    Do you know what is your USB host controller?
    Regards
  • Hello,

    Thank you for your reply.

    I have checked the datasheet of TUSB4041I and TUSB8041; the product ID is the same : 0x0451 0x8140.

    With lsusb -v command, we can see that the device ID is 0451:8142 and TUSB8081 is recognized.

    We can see that the XORed has been added (0x0002), what does this bit stand for ?

    There seems to be no difference between TUSB4041I and TUSB8041I, am I right ?

    Thank you for your help.

     

  • Hi Matt,

    The TUSB4041 and the USB 2.0 hub of the TUSB8041 will report the same PID (8142).  The USB 3.0 hub of the TUSB8041 reports a different PID (8140).  The TUSB4041 datasheet needs to be updated to reflect that.  In either case, if the PID reported is 8142, the hub is a USB 2.0 hub.

    Thanks,

    JMMN

  • Hello,

    Thank you for your answer.

    Ok for your explanation, so everything is normal on this side ; the USB problem I get should come from somewhere else.

    I will do other tests and see if there is still a reset problem.

    Thanks again for your help.

  • Hello,

    I have another questions regarding USB outputs of hub TUSB4041I.

    We often see that on the lines D+ and D-, we have pull-down resistors of 15kohms connected to GND. Are these resistors necessary on these lines ?

    Moreover, we often use common mode shock; are these components used everytime on these lines ? Or just when the signals go out from the board ?

    Thanks a lot for your help.

  • Hello,

    The 15K pull downs are internal to the hub, the chokes are needed only if you are going to put an external USB connector.

    Regards

  • Hello,


    Thank you for your answer.


    I have designed like below, with an output of TUSB4041I on left side and external USB connector on right side

    It is working like this; you said these 2 resistors are not needed ?


    Thanks for your confirmation.

  • Correct, you don't need those 15K resistors, they are already internal in the hub.

    Regards

  • Hello,


    Thank you very much for your fast answer.

    I don't see any data in the datasheet about these internal pull-down resistors. However, I see in the schematics of the evaluation module that they are not implemented.

    Regarding USB Host upstream, do you know if these resistors are needed ?

    Thank you for your support.

  • Hello,
    The TUSB4041 does not implement these PD on the upstream port, if your USB Host does not have those internal then you will require to populate them (many hosts already have them internal, please double check)
    Regards
  • Hello,

    Thank you very much for your answer.
    This information is very helpful for me ; can you please tell me where we can find these data about pull down resistors in the datasheet ?

    Thank you for your support.