ComputersEquipment

What is USB pinout?

Universal USB-bus is one of the popular interfaces of a personal computer. It allows the serial connection of various devices (up to 127 units). Also, USB-bus supports the function of connecting and disconnecting devices with a working personal computer. In this case, the devices can be powered directly through the element, which frees the need for additional power supplies. In this article, we'll look at what the standard USB pinout is. This information can be useful for the self-manufacturing of any USB-adapters or devices receiving power through the interface we are considering. In addition, we will analyze what is the pinout of micro-USB and, of course, mini-USB.

Describing and Unpacking the USB Interface

Almost every PC user knows what a USB connector looks like. This is a flat four-pin type A interface. The USB connector "mother" is labeled AF, and "daddy" is AM. The USB pinout of type A consists of four contacts. The first wire is marked in red, it is supplied with a DC voltage of +5 V. It is possible to apply a maximum current equal to 500 mA. The second contact - white color - is for data transfer (D-). The third wire (green) is also used for data transfer (D +). The last contact is marked in black, the supply voltage is zero (common wire).

Connectors type A are considered active, they are connected to power supplies (computers, host, etc.). Connectors type B are considered passive, they are connected to such devices as printers, scanners and the like. Connectors of type B are a square with two oblique angles. "Mom" has the marking BF, and "dad" - VM. Pinout USB type B has the same four pins (two at the top and two at the bottom), the assignment is identical to type A.

Soldering of micro-USB connectors

Connectors of this type are most often used to connect tablets and smartphones. They are much smaller in size than the standard USB-interface. Another feature is the presence of five contacts. The marking of such connectors is as follows: micro-AF (BF) - "mom" and micro-AM (VM) - "dad".

USB micro pinout:

- the first contact (red color) is intended to supply + 5 V supply voltage;

- the second and third wires (white and green colors) are used for data transmission;

- the fourth lilac color contact (ID) in the B-type connectors is not involved, but in the A-type connectors it is closed to the common wire to support the OTG-function;

- the last, the fifth, the contact (black color) - the zero supply voltage.

In addition to those listed, the cable may have one more wire used for "shielding"; The number is not assigned to it.

Pinout of the mini USB

Mini USB connectors also contain five pins. Label these connectors as follows: mini-AF (BF) - "mom" and mini-AM (BM) - "dad". The pinout of the contacts is identical to the micro-USB type.

Conclusion

Information on wiring wires for USB connectors is very relevant, since this type of interface is used in virtually all mobile and desktop devices and gadgets. These connectors are used both for charging built-in storage batteries, and for data transfer.

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