TUSB8044: schematic check

Gareth:

      I'm working on schematic review and will send feedback by tomorrow.

Regards

brian

Gareth:

• SMBUS low means SMBUS mode enable, do you need to change any hub configuration ?

      if not , please pull SMBUSz high

• Power switching is not implemented for this design, it may cause issue if overcurrent happens

 please provide page 12 and 50 as weel for downstream and upstream port schematic as well.

Regards

brian

Gareth:

     any update?

Regards

Brian

Hi Brian

Regarding TUSB8044, we are connecting to SMbus host of PCH, in case we need any modification.

    For this pin (SMBUSz), I found the datasheet mentioned low for an I2C EEPROM and high for a SMBus host.

    That's why we pull down this pin.

tusb4.pdf

Gareth:

  From datasheet, 0 is SMBus mode, 1 is I2C mode. Once in SMBus mode, hub will wait until SMBus configuration is done.

Regards

Brian

Hi Brian

1. change to I2C mode
=> Do we need to add an EEPROM on I2C bus?
2. change FULLPWRMGM to high, connect OC# and PWRON to hub
    VIC_USB*_EN is from a MCU's GPIO to enable/disable USB ports

Dear customer,

I am following up on this issue. However, the relevant engineer is out of the office and you can expect a response to your thread by Jan 2nd.

Thank you.