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Jac Londe

USB Pinout - Connector Wiring for USB A, USB B, and Mini USB Interfaces - 0 views

www.connections-usa.com/usb_pinout.html

USB connector wiring interfaces arduino objoom

shared by Jac Londe on 27 Aug 11 - No Cached
  • USB Pinout - Connector Wiring for USB A, USB B, and Mini USB InterfacesUSB (Universal Serial Bus) is an interface designed to connect peripherals such as mice, keyboards, scanners, digital cameras, printers, hard disks, and networking components to PC.
  • USB pinout signals USB is a serial bus. It uses 4 shielded wires: two for power (+5v & GND) and two for differential data signals (labelled as D+ and D- in pinout). NRZI (Non Return to Zero Invert) encoding scheme used to send data with a sync field to synchronise the host and receiver clocks. In USB data cable Data+ and Data- signals are transmitted on a twisted pair. No termination needed. Half-duplex differential signaling helps to combat the effects of electromagnetic noise on longer lines. Contrary to popular belief, D+ and D- operate together; they are not separate simplex connections.
  • USB transfer modes Univeral serial bus supports Control, Interrupt, Bulk and Isochronous transfer modes.USB transfer rates: Low Speed, Full Speed, Hi-speed. USB supports three data rates: Low Speed (1.5 Mbit per second) that is mostly used for Human Input Devices (HID) such as keyboards, mice, joysticks and often the buttons on higher speed devices such as printers or scanners; Full Speed (12 Mbit per second) which is widely supported by USB hubs, assumes that devices divide the USB bandwidth between them in a first-come first-serve basis - it"s easy to run out of bandwidth with several devices; Hi-Speed (480 Mbit per second) was added in USB 2.0 specification. Not all USB 2.0 devices are Hi-Speed. A USB device must indicate its speed by pulling either the D+ or D- line high to 3.3 volts. These pull up resistors at the device end will also be used by the host or hub to detect the presence of a device connected to its port. Without a pull up resistor, USB assumes there is nothing connected to the bus. In order to help user to identify maximum speed of device, USB device often specify it's speed on it's cover with one of USB special marketing logos.
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  • USB powered devices The USB connector provides a single 5 volt wire from which connected USB devices may power themselves. A given segment of the bus is specified to deliver up to 500 mA. This is often enough to power several devices
  • USB cable shielding:Shield should only be connected to Ground at the host. No device should connect Shield to Ground.USB cable wires: Shielded:Data: 28 AWG twistedPower: 28 AWG - 20 AWG non-twisted Non-shielded:Data: 28 AWG non-twistedPower: 28 AWG - 20 AWG non-twisted  
  • USB 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.
  • USB 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
  • Pin Name Cable color Description 1 VCC Red +5 VDC 2 D- White Data - 3 D+ Green Data + 4 GND Black Ground 4 pin USB A or USB B plug�connector at the peripherals 4 pin USB A / USB B / mini-USB jack�connector at the controller Pin x of mini-USB connector usually not used or connected to GND.
  • The Universal Serial Bus is host controlled and there can be only one host per bus. An USB system consist of a host controller and multiple devices connected in a tree-like fashion using special hub devices. Hubs may be cascaded, up to 5 levels.
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