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TMS320C5515

Yaron Blecher65338
Prodigy 180 points

Hello,

Is it mandatory to connect VBUS of the USB connector to the USB_VBUS pin of the USB port of DSP Or it's sufficient to connect USB_VBUS pin of DSP to the internal on board voltage constantly? 2. Can USB_VBUS pin of the DSP be connected to 3.3V instead of 5V voltage? Thanks in advance

Best Regards

Yaron 

  • 0
    TI__Expert 6961 points

    1. If you plan to use USB interface in your system; then yes, the USB_VBUS pin must be connected to the USB interface's VBUS. This will be used to detect the USB connection.

    2. If you don't plan to use USB interface in your system, then the USB_VBUS pin must be connected to ground.

     

    Regards

    Wen

  • 0 in reply to Wen Li
    Prodigy 180 points
    We are using the USB but since we use a galvanic isolator the voltage drop to 3.3V, can the DSP USB VBUS can detect 3.3V? Thanks, Yaron
  • 0 in reply to Yaron Blecher65338
    TI__Expert 6961 points

    I am not sure if the USB connection will be reliably detected via the isolator. The USB PHY interface of C55515/5505 will follow the USB 2.0 standard, so if there is any violation cause by the isolator, then there will be a problem.

    Thanks and regards

    Wen

  • 0 in reply to Wen Li
    Prodigy 180 points

     

    Hello Wen,

    USB isolator that we use is a special USB isolator that is intended to work with USB 2.0. Let me clarify my question, is it enough to set 3.3V on Vbus that the C5515 will recognize USB connection or only 5V must be connected to Vbus. About isolator. I used this isolator chip for USB isolation with PIC32F795 of Microchip and it works properly.

    Thanks,

    Yaron