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TUSB2046B design issue

Lucifer
Expert 2600 points
Other Parts Discussed in Thread: TUSB2046B, TPS2044, TUSB2036

We are planning to use TUSB2046B in our project and  have some issue need to be clarified.

 

1. In our application , our USB device are all self-power mode. We don't need TPS2044 power chip.

    How should we do about  PWRONx# and OVRCURx# pins ??

    PWRONx# maybe can be folating , because PWRONx# in output.

    How about OVRCURx# ??  pull-high or others ?

 

2. What function is external EEPROM used for ?  IS only for recordind custom ID and vender ID ?

    Need to use external EEPROM to save config setting when TUSB2046B power-on ?

 

3. In our case , all USB device are self-power mode. BUSPWR need to pull low right ?

    How about EEDATA/GANGED pin set ?

 

4. We only use two port. Please help to give us some suggestion about two port USB-Hub chip datasheet.

 

Thanks!!

  • 0
    TI__Mastermind 18655 points

    Hello,

    The OVRCUR/ input can should have a pull-up resistor and PWRON/ output can be left unconnected.

    As datasheet states external EEPROM is only used when custom PID and vendor ID (VID) are desired. You can do without an EEPROM and it will come up with default VID/PID. You need to tie EXTMEM pin high and EEDATA/GANAGED is then tied high or low based on whether or not you want to have GANGED or per port overcurrent detection. EECLK can be left open.

    The DP and DM signals of the unused port should be tied to ground with 15K resistors like the pull-downs used on the active ports. Please, take a look at the TUSB2036 which is a 2/3-PORT USB Hub.

    Regards,
    Joel