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TUSB8041: TPS2561DRC interfacing JUSTIFICATION?

Pidugu Chaitanya
Prodigy 20 points
Part Number: TUSB8041
Other Parts Discussed in Thread: TPS2561

Hi

The design page (page 33) in  the data sheet  of the controller depicts  the interfacing of TPS2561 (a power distribution switch) with the controller.While in the page  3 topic titled "Description (Continued)" paragraph 2 states

" An individually port power controlled hub switches power on or off to each downstream port as requested by the
USB host. Also when an individually port power controlled hub senses an over-current event, only power to the
affected downstream port will be switched off "

So,if I provide the supply (5V @ 500mA per port (Since I WANT IT IN USB 2.0)) externally do I need to use TPS2561.If so why? SINCE it is said that "when an individually port power controlled hub senses an over-current event, only power to the  affected downstream port will be switched off" - this is the  same functionality  I need  

How should I configure the pins OVERCURxz & PWRCTLx/BATENx .Where do these route to if there is no power distribution ICor should there be one?

Does the controller has the over current protection or are the pins OVERCURxz only for sensing.

  • 0
    TI__Guru 60865 points

    Hello Pidugu,

    Any USB 3.0 capable port should supply 900 mA.  If you are only connecting the USB 2.0 lines of a port, you can limit the power per port to 500 mA as long as battery charging mode is disabled.  If the USB 3.0 signals are connected and only 500 mA is supplied, the devices will still connect at USB 3.0 speeds but there may be interoperability issues for bus powered devices.

    The hub only provides power switch control lines (PWRCTL and OVERCURz)  The hub cannot directly control the VBUS to the downstream ports, you will need an external power switch for this.  The OVERCURz pins are only for sensing, it allows the hub to report the overcurrent event to the host.

    Regards,

    JMMN