Universal Serial Bus (USB)

From HwB

(Difference between revisions)

Revision as of 15:23, 5 July 2007

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

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

UNIQf0a97c416cab67b-keydata-00000000-QINU

@@ Line 1: / Line 1: @@
 Developed by Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC and Phillips.
-== Pinout ==
+== Pinout (Normal) ==
 [[Image:usbam.png]]
@@ Line 20: / Line 20: @@
 |}
-=== Features: ===
+== Pinout (Mini) ==
+Mini-A:
+ _______
+ \'''''/
+  -----   (at the cable)
+Mini-B:
+ _______
+ \·····/
+  -----   (at the cable)
+{| {{border}}
+! 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
+|}
+== Technical specs ==
+=== Features ===
 * True Plug'n'Play.
 * Hot plug and unplug
@@ Line 29: / Line 59: @@
 * Low cost cables and connectors
-=== Bandwidth: ===
+=== 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: ===
+=== Definitions ===
+USB Host = The computer, only one host per USB system.<br/>
-USB Host = The computer, only one host per USB system.<br>
+USB Device = A ''hub'' or a ''Function''.
-USB Device = A <em>hub</em> or a <em>Function</em>.
 === Power usage: ===
-'''Bus-powered hubs:''' Draw Max 100 mA at power up and 500 mA normally.<br>
+'''Bus-powered hubs:''' Draw Max 100 mA at power up and 500 mA normally.<br/>
-'''Self-powered hubs:''' Draw Max 100 mA, must supply 500 mA to each port.<br>
+'''Self-powered hubs:''' Draw Max 100 mA, must supply 500 mA to each port.<br/>
-'''Low power, bus-powered functions:''' Draw Max 100 mA.<br>
+'''Low power, bus-powered functions:''' Draw Max 100 mA.<br/>
-'''High power, bus-powered functions:''' Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.<br>
+'''High power, bus-powered functions:''' Self-powered hubs: Draw Max 100 mA, must supply 500 mA to each port.<br/>
-'''Self-powered functions:''' Draw Max 100 mA.<br>
+'''Self-powered functions:''' Draw Max 100 mA.<br/>
 '''Suspended device:''' Max 0.5 mA
-=== Voltage: ===
+=== 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.
@@ Line 56: / Line 83: @@
 * Normal operational voltage for functions is minimum 4.75 V.
-=== Shielding: ===
+=== Shielding ===
 Shield should only be connected to Ground at the host. No device should connect Shield to Ground.
-=== Cable: ===
+=== Cable ===
-==== Shielded: ====
+==== Shielded ====
 * Data: 28 AWG twisted
 * Power: 28 AWG - 20 AWG non-twisted
-==== Non-shielded: ====
+==== Non-shielded ====
 * Data: 28 AWG non-twisted
 * Power: 28 AWG - 20 AWG non-twisted
@@ Line 84: / Line 110: @@
 |}
-=== Cable colors: ===
+=== Cable colors ===
 {| {{border}}