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 Universal Serial Bus (USB)

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MesajKonu: Universal Serial Bus (USB)   Paz Tem. 19, 2009 5:37 pm

Universal Serial Bus (USB)

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
o 4.1 Features
o 4.2 Bandwidth
o 4.3 Definitions
o 4.4 Power usage:
o 4.5 Voltage
o 4.6 Shielding
o 4.7 Cable
+ 4.7.1 Shielded
+ 4.7.2 Non-shielded
o 4.8 Cable colors
* 5 Contributions
* 6 Sources

Pinout (Normal)





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





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