USB - Universal Serial Bus


Referens:

USB skapades av 

Compaq, Digital Equipment Corp, IBM PC Co., Intel, Microsoft, NEC and Northern Telecom.

 

 

USB A 4 Pin Male4 Pin Hane "A" Kabelanslutning

USB A 4 Pin Female4 Pin Hona "A" Datoranslutning



USB B 4 Pin Male Connector4 Pin "B" Hane Kabelanslutning

USB B 4 Pin Female Connector4 Pin "B" Hona Datoranslutning

 

 

 

Pin

Name

Description

Color

1

VCC

+5 VDC

Red

2

D-

Data -

White

3

D+

Data +

Green

4

GND

Ground

Black

Features:

Uses:

Bandwidth:

Definitions:

USB Host = The computer, only one host per USB system.
USB Device = A hub or a Function.

Power usage:

Bus-powered hubs: Draw Max 100 mA at power up and 500 mA normally.
Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
Low power, bus-powered functions: Draw Max 100 mA.
High power, bus-powered functions: Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.
Self-powered functions: Draw Max 100 mA.
Suspended device: Max 0.5 mA

Voltage:

Shielding:

Shield should only be connected to Ground at the host.

No device should connect Shield to Ground.

 

Cable:

Shielded:
Data: 28 AWG twisted
Power: 28 AWG - 20 AWG non-twisted

Non-shielded:
Data: 28 AWG non-twisted
Power: 28 AWG - 20 AWG non-twisted

Power Gauge

Max length

28

0.81 m

26

1.31 m

24

2.08 m

22

3.33 m

20

5.00 m

Cable colors:

Pin

Name

Cable color

Description

1

VCC

Red

+5 VDC

2

D-

White

Data -

3

D+

Green

Data +

4

GND

Black

Ground