Universal Serial Bus (USB)
From HwB
Developed by Compaq, Hewlett-Packard, Intel, Lucent, Microsoft, NEC and Philips.
Contents |
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:
5 4 3 2 1 ___________ |_˙ ˙ ˙ ˙ ˙_| \ / (at the cable) \_____/
Mini-B:
5 4 3 2 1 ___________ | . . . . . | \ / (at the cable) |_________|
Pin | Name | Description |
---|---|---|
1 | VBUS | +5 VDC |
2 | D- | Data - |
3 | D+ | Data + |
4 | ID |
|
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
Sources
- USB FAQ at USB Implementers Forum
- USB Specification v2.0 at USB Implementers Forum
- USB 3.0 revealed
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