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Original question:

TUSB8044AEVM: EEPROM Utility Enquiry

TUSB8044AEVM: SMBus Slave Configuration through USB

Heewoon Kim
Prodigy 75 points
Part Number: TUSB8044AEVM
Other Parts Discussed in Thread: TUSB8044A

Is it possible to configure the TUSB8044A as I2C/SMBus slave through USB with Host on the other side of the upstream i.e. Processor?

  • 0
    TI__Guru 64326 points

    Hi Heewon,

    Are you trying to I2C write/read to the processor or have the processor I2C write/read to TUSB8044A? For the later SMBUS mode should be used as TUSB8044A is a SMBUS slave in this mode. 

  • 0 in reply to Malik Barton57
    Prodigy 75 points

    Hi Malik,

    I can configure the TUSB8044A in SMBus mode as slave but I was wondering whether the write can be done through the upstream usb port without having to use an external I2C/SmBus controller.

    Kind Regards,

  • 0 in reply to Heewoon Kim
    Prodigy 75 points

    More specifically, if the chip was to receive a usb suspend command from the host would it output a status change? Based on the details below (from the TUSB8044A datasheet) I'm assuming the chip enters a suspend state when instructed by the host? I'm currently looking for a way to control power going to the downstream usb ports without having to use an external I2C/ SMBus controller.

    "If the TUSB8044A is suspended (L2) by the USB host, the USB HID interface must enter suspend, but the I 2C master shall remain active while attempting to complete an active I 2C write request" 

  • 0 in reply to Heewoon Kim
    TI__Guru 64326 points

    Hi Heewon,

    This is correct, TUSB8044A will enter suspend mode when directed by the Host. The host can also direct TUSB8044A to control downstream port power through the use of the Port_Power command. This feature is described int eh USB 2.0 specification. 

  • 0 in reply to Malik Barton57
    TI__Guru 64326 points

    Hi Heewon,

    Is there any more support needed for this issue? If so please reply with any relevant details so that I can further assist you. For now I will be marking this thread as "TI Thinks Resolved". If you have resolved your issue, please post the solution to the original problem/post for others with similar issues.