TUSB8044A: Schematic review

Hi Abhishek,

• I would not recommend installing the pulldown on PWRCTL/BATEN1, just leave it unconnected if not used.
• Unused ports should be left unconnected as well.
• There is an internal pullup resistor on GRSTz so if they are installing an external pullup resistor, I would expect an active reset to be driven to the hub to ensure a long enough reset pulse.
• Is the customer using the billboard function of the TUSB8044A permanently enabled?
• I'm not seeing bulk capacitance on the DFP ports.  I would expect to see at least 10 uF or up to 150 uF to handle in rush currents.
• Series AC capacitors on the SS lines will still meet the USB 3.x specification.  Typically we recommend 100 nF on the TX lines and 330 nF (optional) on the RX lines.
• We do not recommend holding the hub in reset when it is not used.
• USB_VBUS is a detection input and should only be high when an active host is connected.

Regards,

JMMN

Hi JMMN 

Thanks  for  reply

Costumer don't need   billboard  functionality