Universal Serial Bus (USB)

From HwB

(Difference between revisions)

Revision as of 23:21, 9 January 2008

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

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.

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

Sources

USB FAQ at USB Implementers Forum
USB Specification v2.0 at USB Implementers Forum
USB 3.0 revealed

UNIQ355e91af1de1f64c-keydata-00000000-QINU

@@ Line 48: / Line 48: @@
 | 5   || GND  || Ground
 |}
+== Pinout (USB 3.0) ==
+Connectors are backwards compatible with USB 1.1/2.0. The original 4 pins are still there.
+{| {{border}}
+! 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 ==
@@ Line 130: / Line 157: @@
 * [http://www.usb.org/faq.html USB FAQ] at [http://www.usb.org USB Implementers Forum]
 * USB Specification v2.0 at [http://www.usb.org USB Implementers Forum]
+* [http://www.reghardware.co.uk/2008/01/09/ces_usb_3_revealed/ USB 3.0 revealed]
 [[Category:Connector]]