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Universal Serial Bus (USB)

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01/2009
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31-01-2009 15:16
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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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