Universal Serial Bus (USB)

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Universal Serial Bus (USB)

From HwB

Developed by Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC and Philips.



Contents

1 Pinout (Normal)

2 Pinout (Mini)

3 Pinout (USB 3.0)

4 Technical specs

4.1 Features

4.2 Bandwidth

4.3 Definitions

4.4 Power usage:

4.5 Voltage

4.6 Shielding

4.7 Cable

4.7.1 Shielded

4.7.2 Non-shielded

4.8 Cable colors

5 Contributions

6 Sources



Pinout (Normal)

Series-A:







Series-B:







Series "A" plugs are used towards the host system and series "B" plugs are used towards the USB device.



Pin Name Description

1 VBUS +5 VDC

2 D- Data -

3 D+ Data +

4 GND Ground

Pinout (Mini)

Mini-A:



54321

_______

\˙˙˙˙˙/

----- (at the cable)

Mini-B:



54321

_______

\·····/

----- (at the cable)

Pin Name Description

1 VBUS +5 VDC

2 D- Data -

3 D+ Data +

4 ID Mini-A: Ground

Mini-B: Not connected



5 GND Ground

Pinout (USB 3.0)

Connectors are backwards compatible with USB 1.1/2.0. The original 4 pins are still there. Expected transfer rate 4.7Gb/s.



Pin Name Description

1 VBUS +5 VDC

2 D- Data -

3 D+ Data +

4 GND Ground

5 USB3_RX USB 3.0 Data Receive (differential)

6 USB3_RX USB 3.0 Data Receive (differential)

7 GND Ground

8 USB3_TX USB 3.0 Data Transmit (differential)

9 USB3_TX USB 3.0 Data Transmit (differential)









Technical specs

Features

True Plug'n'Play.

Hot plug and unplug

Low cost

Easy of use

127 physical devices

Low cost cables and connectors

Bandwidth

High speed: 480 Mbps speed (in USB 2.0 and above)

Full speed: 12 Mbps speed (requires shielded cable)

Low speed: 1.5 Mbps speed (non-shielded cable)

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

Supplied voltage by a host or a powered hub ports is between 4.75 V and 5.25 V.

Maximum voltage drop for bus-powered hubs is 0.35 V from it's host or hub to the hubs output port.

All hubs and functions must be able to send configuration data at 4.4 V, but only low-power functions need to be working at this voltage.

Normal operational voltage for functions is minimum 4.75 V.

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 VBUS Red +5 VDC

2 D- White Data -

3 D+ Green Data +

4 GND Black Ground

Contributions

Joakim Ögren

Tomas Ögren

Sources

USB FAQ at USB Implementers Forum

USB Specification v2.0 at USB Implementers Forum

USB 3.0 revealed

Retrieved from "http://www.hardwarebook.info/Universal_Serial_Bus_%28USB%29"

Categories: Connector
Serial


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