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5 pin Micro USB A, Micro USB B plug connector layout
5 pin Micro USB A, Micro USB B plug connector
at the cable
5 pin Micro-USB Type A, Type B receptacle connector layout
5 pin Micro-USB Type A, Type B receptacle connector
at the device
Micro-USB is a standard connector for a wide range of portable devices, including cell phones and smartphones
Pin Name Cable color Description
1 VCC Red +5 VDC
2 D- White Data -
3 D+ Green Data +
4 ID   May be N/C, GND or used as an attached device presence indicator (shorted to GND with resistor)
5 GND Black Ground

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.

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