Before opening this article, let me introduce to you maybe " the most familiar stranger" in your life - USB. Do you know? In fact, the full English name of USB is Universal Serial Bus, and the Chinese translation is Universal Serial Bus .
The most familiar stranger | Source: sohu.com
Translated into a language that humans can understand is: A kind of interface technology that is agreed upon by many industry leaders, can integrate many protocols, and realize plug-and-play interface technology for computers and external devices .
With the popularization of new smartphones, mobile phones have gradually become an indispensable and important assistant in our daily lives. This also directly leads to Type C becoming the most familiar type of interface in our daily life.
USB Type C | Source: image.baidu.com
In fact, calling it Type C is not accurate enough. This common mobile phone charging cable interface should be 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 history, a big streak has been achieved, and small A and small B have been crossed? Or does this C do not represent "which generation", but has other meanings?
Do many questions | Source: image.baidu.com
In fact, the answers to both above questions are no. Xiao A and Xiao B are both here, and C is indeed lined up with Xiao A and Xiao B in sequence. Next, let’s re-reach with .
All kinds of USB interface | Source: zhidao.baidu.com
Here I would like to say something more, such as Type A, Type B, Type C, actually talks about the version of the USB interface form, which shows the different interface appearances of ; while 2.0 and 3.0 talk about the version of the USB interface specification. In terms of data, USB2.0 theoretical bandwidth is 480Mbps, while USB3.0 can reach 5Gbps, , so there are leap forward in data transmission capabilities and transmission speed.
So, let’s re-recognize: Standard USB, in fact, its full name should be: USB Type A. From USB 2.0 to USB3.0 era, although its performance has been improving, its appearance has not changed. It should be noted that the commonly used USB Type A interface of also has male and female and female .
Take our common charging cable as an example. This week, the square, smooth on all sides can be inserted into the charger plug or one end of the computer, which is the male. Of course, male headers are generally used in small peripheral devices such as mice and keyboards, or as ends of cables. The following one with U-shaped shrapnel on all four sides is the female , which is often used on upper devices such as host or hub .
USB Type A | Source: Zhihu , image.baidu.com
. As of today, USB Type B has undergone great changes. In the USB 2.0 era, USB Type B still looks a bit stupid big forehead, while By the USB 3.0 era, USB Type B has become a very small bangs .
Moreover, there are certain differences between the usage scenarios of USB Type B and USB Type A, such as printers, scanners, etc. In fact, USB Type B is also divided into male and female . Male . Male is very common, while female is relatively rare.
But if we talk about the working performance of the interfaces of USB Type B and USB Type A, in fact, they are both 4 pins, so the difference in functional performance is not very big. As for why USB Type B and USB Type A appear, it is estimated that it may be for to realize the division of different interface functions of .
Let’s talk about USB Type C in detail. It appears after USB 3.1, but from the appearance, has a smaller size than Type A and Type B, and it does not distinguish between up and down in design, so the plug-in and unplug speed will be faster and more convenient to use.
Look at the performance of USB Type C, which has 24 pins, which can realize more types and faster data transmission and exchange. It adopts the USB 3.1 standard, so the theoretical upper limit of data transmission is 10Gbps, which is doubled compared to USB 3.0.
and is equipped with a standard specification cable of Type C connector. The standard specification cable of the Type C connector can also increase the current, and it also supports USB PD" with USB power supply capacity. The can provide the maximum charging power of 100W. truly realizes the "charging for 5 minutes and talking for two hours" of smartphones. .
USB Type A and USB Type B | Source: bbs.21ic.com
Type A-C | Source: Zhihu
Through the two pictures above, we can clearly see that does not mean that a certain interface form will definitely correspond to USB 3.0 or USB 2.0, but generally those that meet the requirements of USB 3.0 will also be designed to be backward compatible with USB 2.0 or even USB 1.0 compatible .
But compared to this, we are becoming more and more common USB Type The C interface can already implement multiple functions that other USB connectors cannot be achieved by types. It can not only enable smartphones, laptops, to quickly power through USB, but also achieve faster and faster transmission speeds.
So, will not far future be the world of USB Type C? The editor thinks it is very likely , so let's wait and see together!
Wait and see | Source: n.m.sohu.com
References:
[1] What is USB Type-A/B/C interface connector [ONLINE]. Available at: https://blog.csdn.net/junyeer/article/details/53338801,2019-09-05.
[2] Analysis of the difference between USB type-C and type-B and type-A [ONLINE]. Available at: https://zhuanlan.zhihu.com/p/160277569.2020-07-15.
[3] Basic knowledge of USB Type A/B/C and the differences between each version [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.
reprinted content only represents the author's views
does not represent the position of the Institute of Physics, Chinese Academy of Sciences
Source: Institute of Semiconductor, Chinese Academy of Sciences
Edit: Yunkaiyeluo
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