The USB interface may be one of the most versatile interfaces in the world. It has a history of many years. Most of us have witnessed the transformation from the USB 2.0 specification to the USB 3.2 specification today, and have witnessed the bad interfaces that are not universal and anti-human. Deprecated. Why does USB last forever? What does the USB interface look like? Today, USB Interface 3.1 Manufacturer will talk about the development and significance of USB from the three aspects of the USB interface, the evolution of the USB specification, and the current USB.
The USB interface is the change in its appearance, and the USB specification mainly refers to the performance parameters of the USB. This article is separated for the sake of easy understanding.
The full name of USB is Universal Serial Bus, which was established by many PC manufacturers in 1994 to solve the problem of inconsistent PC interfaces at that time. For the structure of the USB interface, I believe everyone is no stranger. With the rapid development of mobile devices, the USB-IF organization has introduced mini USB, Micro USB, USB Type-B, USB Type C 3.1 Interface and other USB interfaces to replace the "giant" USB interface, so the traditional USB interface is now With a new name-USB Type-A.
USB Type C 3.1 Interface
Most post-90s students have witnessed the rise and fall of Mini USB. This interface is popular in the age of MP3 and MP4. It uses a trapezoidal design to avoid user errors, but it basically solves the problem of USB size.
As Android phones occupy the streets and alleys, the Micro USB port is also hot, so there are many people who directly call it "Android port".
USB Type-C is currently a brand new USB interface. In the author's opinion, it almost solves all the defects of the USB interface in the past, including the need to distinguish between positive and negative, and can support a maximum current of 5A. It supports 2.56GB / S speed in the USB 3.2 standard, and the functions of transmitting video and sound signals are not to mention. When you plug in the USB-C socket, you can hear a clear sound. This sound is a mandatory requirement of USB Type-C by USB-IF. It sounds ordinary, but the hard work of countless engineers is hidden behind it.
USB Type-C has 24 pins, and the huge USB Type-A only had 4 at first, making people have to admire the development of technology. The functions of these pins will not be described for everyone, and interested readers can refer to them by themselves, so compared with the Micro USB interface, USB Type-C has increased in size. People often refer to USB Type-C as Type-C. Although there is a more accurate abbreviation-USB-C in the same language, Apple gave us a good start.
Most of us have experienced the change from USB 2.0 to USB3.0. USB 2.0 was released in 2000 when the PC was in the ascendant, and its successor USB3.0 was already in 2008. To the naked eye, it may be that the biggest difference between USB 2.0 and USB 3.0 is that USB 3.0 has changed to a blue socket, but the changes are far more than what you see. Compared with the above interface changes, the standard upgrade is the real USB upgrade.
On the basis of the four pins compatible with USB 2.0, USB 3.0 has added five new pins. In addition to a power ground pin, it is two pairs of pins RX +, RX- and TX +, which are responsible for reading and writing. TX-. In addition, the power supply capability of USB 3.0 has been increased to 900mAh compared to 500mA for USB 2.0. In terms of speed, the speed of USB 3.0 reaches 5Gbps, which is only 20% different from the 6Gbps of the SATA3 interface on the PC.
Since USB 3.1 was fine-tuned after the release of USB 3.1, USB 3.0 has a new name, USB3.1 Gen1. The real USB3.1 is called USB 3.1 Gen2.
The reason why the USB interface can stand for many years is its open attitude and compatibility.