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TUSB4041I: Datasheet question

Naizeng Wang
Expert 5650 points
Part Number: TUSB4041I


Tool/software:

Hi team,

I have some questions about this device.

(1) could you explain more about buffer? I cannot find much info in datasheet. Why each TT has 4 buffers? 

(2) What does it mean by saying upstream port connected/unconnected? 

(3) What is divider mode? 

(4) What is automatic mode? 

  • 0
    TI__Guru**** 153370 points
    Naizeng Wang said:

    (1) could you explain more about buffer? I cannot find much info in datasheet. Why each TT has 4 buffers? 

    two buffers for IN Bulk transaction  and two for OUT BULK transaction , so IN and OUT transaction  can be done at the same time.

    Naizeng Wang said:
    (2) What does it mean by saying upstream port connected/unconnected? 

    For TI hub device, upstream port needs to be disconnected from host  for DCP.

    but for CDP, upstream port  needs to be connected to host.

    Naizeng Wang said:
    (3) What is divider mode? 

    This is special charger mode other than BC1.2, there is voltage divider on DP/DM, based on the voltage on DP/DM, hub will know this is divider mode.

    Naizeng Wang said:
    (4) What is automatic mode?

    in automatice mode , it provides support for DCP devices and devices that support custom charging indication. When in AUTOMODE, the port automatically switches between a divider mode and the DCP mode depending on the portable device connected.

       Let me know if you still have questions

    Best

    Brian