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TUSB1210 Implementation in an USB Device

Noah Root
Prodigy 120 points
Other Parts Discussed in Thread: TUSB1210

Hello,

I have a few questions with using TUSB1210 in the device implementation. I plan on using the ULPI input clock mode configuration and the device will be self-powered.

1. In a self-powered device configuration, do I still need to connect the VBUS pin on TUSB1210 to the +5V on the USB connector (pin 1)? If so, how does TUSB1210 use the input? Is it only an indicator or does it actually draw current from the +5V bus?

2. Should the TUSB1210 ground connections be common with the ground on the USB connector (pin 4)?

3. Beside Figure 10.2 in the TUSB1210 datasheet, are there any other reference designs for using TUSB1210 in a device configuration?

Thanks,

Noah 

  • 0
    TI__Mastermind 36085 points

    Hello Noah,

    Here you go the answers to your questions:

    First of all, the TUSB1210 does not strictly require VBUS to function. A Host controller Link may require VBUS detection via ULPI RxCmd (see ULPI V1.1 specification standard P16 Table7) using CPEN (TUSB1210) to enable an external supply on VBUS pin.  Otherwise it may not be required. On the other hand, a Device controller Link will require VBUS detection via ULPI RxCmd in order to detect a host connection. Therefore whether or not VBUS pin of TUSB1210 needs to be connected to the USB connector depends on the Link controller requirements, not TUSB1210.

    Yes you can connect the pun 4 of the USB connector to the common grounds on the TUSB1210.

     Unfortunately we don't have more references for device mode.

    Best regards,

    Diego.

  • 0 in reply to Diego Cortes
    Intellectual 345 points

    Hi Naoh and Diego,

    I would like to add little bit more information in 1st answer. According to me, Vbus pin of PHY chip must be connected to Vbus pin of USB connector even if we are designing self-powered device. Please have a look at attached screen-shots. 

    Following is from USB2.0 specification.

    Second one is from OTG specification.

    Hope this would be useful.

    Cheers,

    Bhaumik