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TUSB1210: OTG Related Issue

Jiaqi Wang
Intellectual 2030 points
Part Number: TUSB1210

Hi expert,

My customer is using TUSB1210 in their new project. And they have some question related to the OTG function.

1. There is such a description of OTG in datasheet. Could you please help check the meaning. Is it an internal resistor of the chip?Or do we need to design pull-up or pull-down resistors outside the device? At present, we do not set any resistors on the board, and the OTG line is directly shorted from the ID pin to the ground. Is it right? 

2. Is there any way to make TUSB1210 send commands to the lower computer to enter the eye diagram test mode? The eye diagram in OTG mode needs to be tested.
Looking forward to your reply! Many thanks!
BR,
Jiaqi Wang
  • 0
    TI__Guru*** 131765 points

    Jiaqi:

        1:Those are internal resistors, you just connect ID pin to USB connector.

        2: this windows system or Linux system?

    regards

    brian

  • 0 in reply to Brian Zhou
    Prodigy 110 points

    Dear zhou,

    1.the spec shows external reisistor in the above picture. please confirm.

    2.it is linux system with arm. please help share the command.

  • 0 in reply to yanqing liu
    TI__Guru*** 131765 points

    1:sorry, it's external resistor.

    2: Linux command: lsusb /v.

    Regards

    Brian

  • 0 in reply to Brian Zhou
    Prodigy 110 points

    1. if Rid_gnd is external resistor, dose it mean i need sery a resistor between ID pin of TUSB1210 and connector? how to deal Rid_float?

    2. lsusb /v is lsusb -v? this is to check usb device information. i want TUSB1210 to send a command to force OTG device send test packet for eye diagram test.

  • 0 in reply to yanqing liu
    TI__Guru*** 131765 points

    !: no, you just connect ID pin to USB connector. If  detect Rid_gnd,, it is configured as host, if floating, it is configured as device.

    2: this is how to sent test package.

  • 0 in reply to Brian Zhou
    Prodigy 110 points

    Dear zhou,

    Q1 i don't quite understand. where is this external resistor. the OTG cable ID pin is connect to GND directly

  • 0 in reply to yanqing liu
    TI__Guru*** 131765 points

    An OTG cable has a micro-A plug on one end, and a micro-B plug on the other end (it cannot have two plugs of the same type). OTG adds a fifth pin to the standard USB connector, called the ID-pin; the micro-A plug has the ID pin grounded, while the ID in the micro-B plug is floating. A device with a micro-A plug inserted becomes an OTG A-device, and a device with a micro-B plug inserted becomes a B-device. The type of plug inserted is detected by the state of the pin ID.