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TUSB2077A Suspend Mode

Adair Rodriguez
Prodigy 130 points
Other Parts Discussed in Thread: TUSB2077A

Hello,

I am working with the TUSB2077A, and it's be working fine. I just have a new requirement. I have a tablet connected to the master USB. And I need the HUB to go to suspend mode and to turn off all the PWRONn signals, once it detects that the master USB signals from the tablet are gone.

I know I could use the Suspend Mode PIN, but I can't get a pin from the tablet. That's why I need the HUB to detect when the Tablet is OFF, and turn off all the PWNRON pins

Is it possible to do this?

THANK YOU

  • 0
    TI__Mastermind 18655 points
    Hello Adair,

    PWNRON pins are fully under the control of the host system. The TUSB2077A (or any other hub peripheral) can only respond to commands issued by the hosts system, which is a combination of the host controller and operating system.
    The USB host controls the port power of a USB hub using the SET PORT FEATURE (PORT POWER) and CLEAR PORT FEATURE (PORT POWER) commands, these commands cause the TUSB2077a to assert or dessert the PWRONz outputs. These commands are automatically by the USB driver loaded on the USB host. The power commands are sent during system power on / off, reboot, sleep and resume as needed. They will also be sent during overcurrent conditions. It is possible to generate these commands using another application, but it would likely require a custom USB driver to be used.

    Regards