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TUSB8041: Questions for PWRCTL and GANGED.

Mark Chen52
Expert 8795 points

Part Number: TUSB8041

Hi Expert,

Customer has two type over current circuit, one is E-Fuse and the other one is thermal fuse. they have 3 questions as below, could you help to check it?

 

  1. For PWRCTL, due to not supporting battery charging, we do not implement the pull up resister. However, should be connect PWRCTL to the enable of e-fuse? Is it necessary?

 

  1. If the PWRCTL is connected to the enable of e-fuse, could you explain what the condition it is when over current is happened?

 

  1. There are two type over current circuits are implemented to one USB hub. The strap of GANGED should be Individual power control or Power control gangs?

Regards,

Mark

  • 0
    TI__Guru 60870 points

    Hi Mark,

    Can you share the circuit of the efuse?  Power control is not required, but if it is not used FULLPWRMGMTz should be set to 1.

    If the hub sees a overcurrent event reported on a port, it will disable the PWRCTL and report the event to the USB host.  The USB host will then disable power on the port using USB commands.  Please note that the hub will only disable power on the port as long as the overcurrent is reported if the USB host leaves power logically enabled.

    The setting of GANGED indicates if various ports use the same power / overcurrent controls.  Do any of the ports share the same PWRCTL or overcurrent signals?

    Regards,

    JMMN

  • 0 in reply to JMMN
    Prodigy 10 points

    Hi JMMN,

    Please refer to below attchment for the schematic.

    One hub is implemented w/ 2 e-fuse. Is it not the same power control?

    For power control, did USB host use USB commands to make USB hub control PWRCTL?

    MiTAC_RX2530M7_USB_HUB_20200720.pdf

  • 0 in reply to Wila Wang
    TI__Guru 60870 points

    Hi Wila,

    I don't see that the power distribution switches in the design are e-fuses? 

    In any case, the application implements both port power control and individual port power management so FULLPWRMGTz should be 0, and GANGED should be 0, too.

    The USB host will send the hub USB commands to assert / deassert the PWRCTL outputs of the hub.

    Regards,

    JMMN