[SI-LIST] USB Receptacle Shield Connection

From: "Steve Barton" <steve.barton@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Date: Mon, 25 Jan 2010 12:12:47 -0800

Hi, SI Experts,
 
What's the latest thinking on how the shield (metal shell) of a USB
Series B Receptacle should be electrically connected to the GND plane of
the PCB in the peripheral?  For USB signal integrity and minimum
susceptibility to EMI picked up by the USB cable.
 
* for a 12 Mbit/s Full Speed
* for a 480 Mbit/s High Speed
 
Have seen direct connection, ferrite bead and parallel
resistor/capacitor used to go between the shield and the PCB GND.
 
In this same topic, what is the opinion on how the Power GND on pin 4 of
the Series B Receptacle should be connected to the GND plane on the PCB.
A direct connection, or a ferrite bead?
Cheers,
Steve


 

 
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[SI-LIST] USB Receptacle Shield Connection

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