[sdiy] semi-OT: USB cable shield

[Ingo Debus]

Am 22.04.2014 um 23:07 schrieb Neil Johnson:

> Ingo Debus wrote:
>> as far as I know, the shield of USB connectors usually is connected directly
>> to ground. However I've seen designs where there's a smallish capacitor (10
>> nF) in parallel with an 1 megohm resistor between the housing of the USB
>> receptacle and ground. Why is this?
> 
> To control RFI.
> 
> http://www.ti.com/sc/docs/apps/msp/intrface/usb/emitest.pdf

Interesting read, but doesn't answer my question. On the contrary, they say the USB receptacle should be tied to the ground plane (fig. 12).

Funny, an Intel document on TI's web site...

Ingo