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TUSB8041 Questions on power management

INg
Genius 3475 points
Other Parts Discussed in Thread: TUSB8041

HI

I would like to check with you on some of the below points with regards to TUSB8041 

  • Does this part support suspend mode and what is the current consumption?
  • Is it possible to design this part for interoperated between bus and adaptor powered?
  • How does TUSB8041  manage the current allocation for each downstream?
    • In the event there are 4x USB3 (900mA) devices connected?
    • In the event there are 1x USB3 (900mA) and ix USB2 (500mA) device connected?
  1. In the event of bus power operation
    1. What would be max current that TUSB8041 can draw from up-stream?
    2. How does it manage the power distribution if downstream devices need more than BUS can support?

Ivan

  • 0
    TI__Genius 9315 points

    Hi Ivan,

    Yes, TUSB8041 does support suspend mode, please refer to section 8.7 on datasheet for the current consumption values.

    For question 1.1, the max current TUSB8041 can draw from US port is the max current the host is able to provide, typically 900mA

    For Question 1.2, when an individually port power controlled hub senses an over-current event, only power to the affected downstream port will be switched off.

    Regards.
    JC

  • 0 in reply to Jose Carlos Gil
    Genius 3475 points

    HI JC

    Thanks for your kind reply.

    There are a few more doubts which i need your help to advise

    • Is it possible to design this part for interoperated between bus and adaptor powered?
    • How does TUSB8041  manage the current allocation for each downstream?
      • In the event there are 4x USB3 (900mA) devices connected?
    • In the event there are 1x USB3 (900mA) and ix USB2 (500mA) device connected?

    Ivan

  • 0 in reply to INg
    TI__Guru 60870 points

    Hello Ivan,

    The TUSB8041 is not designed to run as a bus-powered device, although it can be done in a closed system.  The TUSB8041 is compliant with the USB standards as a self powered hub device.  The TUSB8041 does not manage the current allocation for each downstream port, as this is not required by the USB specification.  For a USB 3.0 bus powered device to receive a USB logo it must consume 900 mA or less and for a USB 2.0 bus powered device to receive a USB logo it must consume 500 mA or less, but the USB hosts and hubs do not manage the power other than to report overcurrent events.

    Regards,

    JMMN