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Original question:

TUSB2046B: TUSB2046B customer query.

TUSB2046B: not working

Shinu.V.Mathew
Expert 7645 points
Part Number: TUSB2046B

Tool/software:

Hi Team,

Whenever there is no devices connected to down PORT2 of hub through USB connector (irrespective of USB keyboard or mouse), devices connected to down port 3 and port 4 is not working. However, as soon as device is connected to port 2,  devices connected to port 3 and port 4 started working.

Please find below schematic for reference , can you please check and comment. 

Regards, Shinu. 

  • 0
    TI__Guru** 111250 points

    Hi Shinu:

      Here are issues I found form schemaiic:

    1:  pin 26 EXTMEM should be directly pulllup to 3.3v.

    2:  there are two 1.5k pullup to 3.3v on DP0, only one is needed.

    3: No 1.5k pullup needed on DP1.

    4: There is no 5v for downstream port 4.

    5:  what status on pin6 GANG mode?

    Regarsd

    Brian