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How to improve the anti-interference ability of usb.

LAM MORK
Prodigy 110 points


I am now using the C28075 DSC to design a servo driver product. However, when I use the USB for communication, I found that the USB signal is Interfered by the switching power supply. I have try to attach magnet ring to the USB wire, but it seems it is useless.

Therefore, is it any method to improve the anti-interference ability of the USB?  Circuit  of PCB design would be ok.

Best regards.

Lam Mork

  • 0
    Guru 192875 points
    Hi Lam,

    External Ferrite core or ferrite core based USB cable is the best option to get rid of frequent disconnections. If that doesn't help you much then try using hardware filters.

    Regards,
    Gautam
  • 0
    TI__Expert 8950 points

    Lam,

    We'd have to know more about your design to guess at a full solution. Make sure you're using a good-quality double-shielded USB cable. For the board layout, the DP and DM signals should be in a 90-ohm differential pair. Also, make sure you're using a crystal as the source for the USB bit clock (AUXPLLCLK), and that the USB bit clock is 60 MHz.