What is the USB connection?

Universal USB-bus are one of the most popular computer interfaces. They debuted in 1997, and after only three years a new version (2.0) appeared, accelerated by 40 times compared with the original one. However, despite such progress, manufacturers realized that speed is still not enough to use external hard drives and other high-speed devices. And now a new USB-interface (type 3.0) has appeared. The new standard exceeded the speed of the previous version (2.0) by 10 times. This article is devoted to such an issue as the wiring of the USB connector. This information can be useful to radio amateurs who independently manufacture any USB-adapters or devices receiving power via USB-bus. In addition, consider what is a pinout of a USB connector such as a micro USB and mini USB.

Description

Many radio amateurs were faced with a problem when an improperly connected USB port led to the burning of flash drives and peripherals. To avoid such situations, it is necessary that the USB connector is wired correctly according to accepted standards. The USB 2.0 connector is a flat connector with four contacts, it is marked AF (BF) - "mom" and AM (BM) - "dad". Micro-USB have the same marking, only with the prefix micro, and devices such as mini, respectively, - the mini prefix. The last two types differ from the standard 2.0 in that there are already 5 contacts in these connectors. And, finally, the latest type is USB 3.0. Externally, it looks like type 2.0, but in this connector uses as many as 9 contacts.

Pinout of USB connectors

The pinout of the USB 2.0 connector is as follows:

- the first wire (red color), it is supplied with a DC supply voltage of +5 V;

- the second contact (white color), it is used for information transfer (D-);

- the third wire (green color), it is also intended for information transfer (D +);

- the fourth contact (black color), it is fed with a zero supply voltage, also called a common wire.

As already mentioned above, micro and mini types are a five-pin USB connector. The pinout of such a connector is identical to type 2.0, except for the fourth and fifth terminals. The fourth contact (lilac color) is the ID. In connectors of type B it is not used, but in connectors of type A, they are closed to a common wire. The last, the fifth output (black color) is the zero of the supply voltage.

Pinout of USB 3.0 connectors

The first four contacts are completely identical to the standard 2.0, we will not dwell on them. The fifth contact (blue) is used to transmit information with the minus sign of USB3 (StdA_SSTX). The sixth conclusion is the same, but with a plus sign (yellow color). Seventh - additional grounding. The eighth pin (purple) is for receiving USB3 data (StdA_SSRX) with a minus sign. And, finally, the last ninth (orange color) is the same as the seventh, but with a plus sign.

How do I remove the USB connector for charging?

Any charger uses only two wires from the USB connector: + 5V and a common contact. Therefore, if you need to solder to the "charging" connector type USB 2.0 or 3.0, then you should use the first and fourth contacts. If you use mini or micro types, in this case it is necessary to solder to the first and fifth conclusions. The most important thing when applying power is to observe the polarity of the device.