Shulou(Shulou.com)11/24 Report--

Before opening this article, let me introduce you to USB, perhaps the "most familiar stranger" in your life. You know what? In fact, the English full name of USB is Universal Serial Bus, and the Chinese translation is Universal Serial Bus.

Translated into a language that humans can understand is: a unified by many industry leaders, able to integrate many protocols together, to achieve plug-and-play interface technology between computers and external devices.

With the popularity of new smart phones, mobile phones have gradually become an indispensable assistant in our daily lives. This also directly leads Type C to become the most familiar type of interface in our daily life.

Pixabay actually, call it Type C is not accurate enough, this common mobile phone charging cable interface should be called USB Type C. But have you ever thought that USB Type C is so well known, where are USB Type A and USB Type B?

Is it possible that in the long river of historical progress, large-step development has been realized, and small A and small B have been crossed? Or does this C not stand for "what generation", but has other meanings?

In fact, the answer to both questions above is no. Small A and small B are both present, and C is indeed followed by small A and small B in turn. Let's re-examine USB Type A and USB Type B.

Here to say one more sentence, such as Type A, Type B, Type C this is actually talking about the USB interface form version, the performance is the interface appearance of different; and 2.0, 3.0 these are said to be USB interface specification version. With data to speak, USB2.0 theoretical bandwidth of 480Mbps, while USB3.0 can reach 5Gbps, so there is a leap in data transmission capacity and transmission speed.

So, re-recognize: standard USB, in fact, its full name should be called: USB Type A. From USB 2.0 to USB 3.0, although its performance has been improving, its appearance has not changed. Note that the commonly used USB Type A interface is also divided into male and female heads.

Take our common charging cable as an example, this square, four-sided smooth plug-in charger plug or one end of the computer, is the male head. Admittedly, the male head is generally used in small peripheral devices such as mice and keyboards, or as a cable end. The following four sides with U-shaped shrapnel is the female head, which is often used in the host or hub and other upper equipment.

However, USB Type B has undergone great changes since its development. In the USB 2.0 era, USB Type B still looks a little silly, and in the USB 3.0 era, USB Type B has become a very small Qi Liu.

Moreover, there are certain differences between the use scenarios of USB Type B and USB Type A, such as printers, scanners and other large external devices. In fact, USB Type B is also divided into male and female heads, male heads are very common, female heads are relatively rare.

However, if you say the working performance of USB Type B and USB Type A interfaces, they are actually 4 pins, so the difference in functional performance is not very large. As for why USB Type B and USB Type A appear, visual inspection may be to achieve the division of different functions of the interface.

Let's talk about USB Type C in detail, it appears after USB 3.1, but from the appearance point of view, it has a smaller volume than Type A and Type B, and it is not distinguished from the top and bottom in design, so the plugging speed will be faster and more convenient to use.

Take a look at the performance of USB Type C, which has 24 pins, enabling more types and faster data transfer and exchange. It uses USB 3.1 standard, so the theoretical upper limit of data transmission is 10Gbps, which is double that of USB 3.0.

The standard specification connection cable equipped with Type C connector can also be improved through current. It also supports " USB PD" beyond the existing USB power supply capacity, and can provide charging power up to 100W, which truly realizes the "charging for 5 minutes and talking for two hours" of smart phones.

USB Type A and USB Type B| Source: bbs.21ic.com

Type A-C |Source: Knowing that through the above two figures, we can clearly see that it is not that a certain interface form absolutely corresponds to USB 3.0 or USB 2.0, but generally meets the requirements of USB 3.0 will also be designed to be compatible with USB 2.0 or even USB 1.0.

However, in comparison, our more and more common USB Type C interface can already achieve many functions that other USB connector types cannot achieve, which can not only enable smart phones and laptops to supply power quickly through USB, but also achieve faster and faster transmission speeds.

So, will the near future be the world of USB Type C? Xiang Ning thinks it's possible, so let's wait and see!

References:

[1]What is USB Type-A / B / C connector [ONLINE]. Available at: https://blog.csdn.net/ junyeer / article / details / 53338801,2019-09-05.

[2]USB type-C and type-B, type-A difference analysis [ONLINE]. Available at: https://zhuanlan.zhihu.com/ p/160277569.2020-07-15.

[3]USB Type A / B / C basics and differences between versions [ONLINE]. Available at: https://blog.csdn.net/ junyeer / article / details / 53338801.2016-11-25.

[4] Iozzio, Corinne. WHAT IS USB TYPE C? [J]. Popular Science,2014,284(4).

[5]What is USB Type-C? [ONLINE]. Available at: https://zhuanlan.zhihu.com/ p/28974787.2017-09-13.

This article comes from Weixin Official Accounts: Institute of Semiconductors, Chinese Academy of Sciences (ID: bdtdsj), author: Yan Xiangning, editor: Mu Xin

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.