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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   Mode Detect. 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.

The exact connector name is Micro-USB C or Micro-USB AB connector and it is documented in the USB standards, although some added pseudo-standards are found in the common implementation that are neither disallowed nor explicitly required by the documentation.

The device with the 5-pin connector has a pullup to high on the connector.

Low (small value resistor to ground or connection to ground) if you are connecting an accessory that the device must ask as a host for.

Let it remain high (no-connect) for a connection that the device should remain in normal (slave/client/peripheral) mode for.

Additional Psuedo-standard added by some device manufacturers: If there is no-connect on the data pins, the device will assume it is connected to a charging only cable.

Additionally, most devices can receive power in host mode, even though this is not part of the standard.

5 pin Micro USB A, Micro USB B plug схематический вид разъема
Разъем 5 pin Micro USB A, Micro USB B plug
at the cable
5 pin Micro-USB Type A, Type B receptacle схематический вид разъема
Разъем 5 pin Micro-USB Type A, Type B receptacle
at the device
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Распиновка одной картинкой:Разъем Micro-USB портативных устройств
Разъем Micro-USB портативных устройств diagram
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