Universal Serial Bus (USB)

From HwB

(Redirected from USB)

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

Contents

[edit] Pinout (Normal)

Image:usbam.png

Image:usbbm.png

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

[edit] Pinout (Mini)

Mini-A: 

 54321
_______
\藱藱藱藱藱/
 -----   (at the cable)

Mini-B: 

 54321
_______
\路路路路路/
 -----   (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

[edit] 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)


[edit] Technical specs

[edit] Features

  • True Plug'n'Play.
  • Hot plug and unplug
  • Low cost
  • Easy of use
  • 127 physical devices
  • Low cost cables and connectors

[edit] 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)

[edit] Definitions

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

[edit] 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

[edit] 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.

[edit] Shielding

Shield should only be connected to Ground at the host. No device should connect Shield to Ground.

[edit] Cable

[edit] Shielded

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

[edit] 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

[edit] Cable colors

Pin Name Cable color Description
1 VBUS Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 GND Black Ground

[edit] Contributions

[edit] Sources

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