The full English name of the USB is Universal Serial Bus. An interface technology that has been agreed upon and unified by many industry leaders, can integrate many protocols, and realize plug-and-play connections between computers and external devices.
With the popularization of new smartphones, mobile phones have gradually become an indispensable and important assistant in our daily life. This directly leads to Type C becoming the most familiar type of interface in our daily life.
In fact, calling 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?
Could it be that in the long river of historical progress, a big-step development has been realized, and small A and small B have been crossed? Or is this C not representing generations, but other meanings?
In fact, the answer to the above two questions is no. Little A and little B are both there, and C is indeed lined up next to little A and little B. Next, let's re-understand USB Type A and USB Type B together.
Type A, Type B, and Type C actually refer to the version of the USB interface form, showing the difference in the appearance of the interface; while 2.0 and 3.0 refer to the version of the USB interface specification.
Data: The theoretical bandwidth of USB2.0 is 480Mbps, while that of USB3.0 can reach 5Gbps, so there is a leap forward in data transmission capacity and transmission speed.
So, let’s get to know it again: Standard USB, in fact, its full name should be: USB Type A. From the era of USB 2.0 to USB 3.0, although its performance has been improving, its appearance has not changed. It should be noted that the commonly used USB Type A interface is also divided into male and female.
Take our common charging cable as an example, this week is square, and the end with smooth sides can be plugged into the charger plug or the computer, which is the male head. It is true that male headers are generally used in small peripheral devices such as mice and keyboards, or as the ends of cables. The following one with U-shaped shrapnel on all sides is the female head, which is often used on upper-end devices such as hosts or hubs.
Since its development, USB Type B has undergone great changes. In the era of USB 2.0, USB Type B still looks a little silly with a big forehead, but in the era of USB 3.0, USB Type B has become a very small and neat bang.
Moreover, the usage scenarios of USB Type B are somewhat different from those of USB Type A, such as larger external devices such as printers and scanners. In fact, USB Type B is also divided into two types: male and female. The male is very common, while the female is relatively rare.
But if we talk about 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 big. As for why there are two types of USB Type B and USB Type A, a visual inspection may be done to realize the division of different functions of the interface.
Let’s talk about USB Type C in detail. It appeared after USB 3.1, but from the appearance, it has a smaller volume than Type A and Type B, and it does not distinguish between top and bottom in design, so the insertion and removal speed will also increase. Faster and easier to use.
Let's look at the performance of USB Type C again. It has 24 pins inside, 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 double that of USB 3.0.
The standard cable equipped with a Type C connector can also increase the current through, and also supports USB PD that exceeds the existing USB power supply capacity, and can provide a maximum charging power of 100W, truly realizing the charging of smartphones in 5 minutes talk for two hours.
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| USB Type A vs. USB Type B | Source: bbs.21ic.com |
Through the above two pictures, we can clearly see that it does not mean that a certain interface format absolutely corresponds 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 in comparison, the more and more common USB Type C interface can realize many functions that cannot be realized by other USB connector types. It can not only enable smartphones and laptops to quickly The faster the transfer speed.
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