Linked Questions

5
votes
1answer
2k views

What is the metal sheath surrounding a USB connector, and is it commonly connected?

I was tearing apart a mouse for repairs and noticed that the small plug for the USB connection had a fifth connection. This connection had a much thicker wire than the other four. I assume it is ...
38
votes
7answers
21k views

USB Shield. To ground or not to ground?

I have been given a device at work to do some testing on. Basically an IC is becoming obsolete so I need to test a replacement part. Upon redoing the ESD checks, the device failed. I checked the ...
10
votes
1answer
4k views

EMI/ESD protection for USB interface?

I'm a student making a simple Arduino-compatible board similar to the Pro Micro and am going to put a USB connector on the board. The schematic in the above link doesn't show any kind of EMI/ESD ...
12
votes
1answer
6k views

USB 3.0 Hub shield connection

This is about the seemingly controversial shield to ground connection. The system is basically a body-worn intel-based computer, powered by a battery. Two USB 3.0 (or 3.1 Gen1) cables come out to a ...
1
vote
2answers
4k views

Is the bracket of a graphics card grounded?

I would guess so, but I want to make sure. Edit: After measuring with a multimeter, I suspect that brackets (of most graphics cards) are grounded to the graphics card's ground-plane. I measured 0 ohm ...
5
votes
2answers
2k views

How to correctly connect a USB shield on a PCB

I have designed a simple PCB on EasyEDA; I am using USB 3.0 as a convenient means of providing power, ground and taking outputs from the magnet sensors (connected to the PCB) which will be routed to ...
3
votes
3answers
2k views

Does an overvoltage TVS for USB hot-plugging connect to shield ground?

I am designing a keyboard which will connect to the computer via usb-miniB to charge a LiPo battery. The datasheet for the charging IC I am using specifies overvoltage protection on the USB power ...
1
vote
2answers
2k views

DMX: What should I do with ground and shield?

I'm currently developing a DMX interface (master interface) with USB and Ethernet connections. The power for my device I'm retrieving from the 5V of the USB connector. The shield of the USB connector ...
1
vote
1answer
3k views

Why is the usb shield always tied to ground (GND pin)?

The shielding on a cable is to avoid interference from the outside world however it is always tied directly to the GND pin. Not inside the cable itself but inside a device. Every single device I take ...
0
votes
2answers
1k views

Protecting USB hub from ESD

I am working with a robot that uses USB (not by choice lol) in a very static-prone environment, and I'm having problems with ESD locking up my USB hub. I found an "Industrial" USB hub that claims it ...
2
votes
0answers
86 views

How to terminate Shield of USB connector to System Ground via Resistor || Capacitor or Ferrite Bead?

I want to know the best approach to connect USB connector's (receptor) Shield to System Ground? Below are the two options. PC(Earthed)<----- USB Cable ----> USB Connector female(PCB with NO ...
2
votes
0answers
50 views

Which ground plane connection will perform better in terms of EMC? [duplicate]

In figure 12 of these EMI Design Guidelines for USB Components, I can see that VBUS and Gnd signals from the USB receptacle are bypassed with ferrite beads and then connected to their respective power ...
2
votes
1answer
44 views

Padding between USB and panel

Our product has a hole on the metal panel for the USB2.0 type B port. However, due to the mechanic size variation, on some panels, the USB connector can't touch the panel at all. As indicated in the ...