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USB connector shield

Discussion in 'General Electronics Discussion' started by Rajinder, Apr 21, 2021.

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  1. Rajinder


    Jan 30, 2016
    Hi all,
    I wonder if someone could please clear this up for me.
    I have a portable tablet device which has a USB type A connector. Which I am going to connect a separate set of electronics, to get power and GND via a micro USB connector.
    Do I need to connect the shield of the micro USB to OV or can I leave it unconnected.
    I am using a FTDI IC FT232 device.
    I have seen on their guidelines, they use a 0R resistor to connect the shield to 0V. I have seen other documents showing the same connection using a ferrite bead. Also one where a Capacitor is used. I know this is for EMI, but which one do I use?
    My second question is that do I need to place the micro USB connector with a GND plane underneath or nothing? I think it may depend upon my the outcome of my first question.
    Any help would be appreciated, ask if I am really unsure.
    Thanks in advance.
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    Nov 17, 2011
    This question has been asked before - and answered.
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