Universal Serial Bus (USB)
The USB is serial bus commonly used in computers.
Overview
| Standard |
Speed |
Current |
| USB 1.0 (1996) |
12 Mbit/s |
100 mA |
| USB 2.0 (2000) |
480 Mbit/s |
500 mA |
| USB 3.0 (2008) |
5.0 Gbit/s |
900 mA |
| USB 3.1 (2013) |
10 Gbit/s |
|
| USB 3.2 (2017) |
20 Gbit/s |
|
Maximum devices: 127. Cable length: \(< \SI{5}{m}\)
USB Connectors
USB 2.0
| Pin |
Signal |
Color |
Meaning |
| 1 |
VBUS |
Red |
Vdd |
| 2 |
D- |
White |
Inverted Signal |
| 3 |
D+ |
Green |
Signal |
| 4 |
GND |
Black |
Ground |
| Spec |
|
| Speed |
480 Mbit/s |
| Voltage |
5.0 ± 0.25 V |
| Current |
100mA, 500mA, 5A |
| Length |
< 5 m |
The practical speed is 280 Mbit/s due to bus access constraints.
Pinout
Standardstecker A / B
|
Pin
|
Color
|
Signal
|
Description
|
|
Shell
|
n.a.
|
Shield
|
Schirmgeflecht
|
|
1
|
Red
|
VBUS
|
+5 V
|
|
2
|
White
|
D−
|
Data USB 2.0, differential Pair −/+
|
|
3
|
Green
|
D+
|
|
4
|
Black
|
GND
|
Ground
|
USB 3.0
|
Pin
|
Color
|
Signal name
|
Description
|
|
A connector
|
B connector
|
|
Shell
|
N/A
|
Shield
|
Metal housing
|
|
1
|
Red
|
VBUS
|
Power
|
|
2
|
White
|
D−
|
USB 2.0 differential pair
|
|
3
|
Green
|
D+
|
|
4
|
Black
|
GND
|
Ground for power return
|
|
5
|
Blue
|
StdA_SSRX−
|
StdB_SSTX−
|
SuperSpeed transmitter differential pair
|
|
6
|
Yellow
|
StdA_SSRX+
|
StdB_SSTX+
|
|
7
|
N/A
|
GND_DRAIN
|
Ground for signal return
|
|
8
|
Purple
|
StdA_SSTX−
|
StdB_SSRX−
|
SuperSpeed receiver differential pair
|
|
9
|
Orange
|
StdA_SSTX+
|
StdB_SSRX+
|
|
The USB 3.0 Powered-B connector has two additional pins for power
and ground supplied to the device.
|
|
10
|
N/A
|
DPWR
|
Power provided to device (Powered-B only)
|
|
11
|
DGND
|
Ground for DPWR return (Powered-B only)
|
References