With the popularization of various digital devices, especially the popularity of mobile phones and tablets, there are more and more USB devices around us. Every mobile phone and tablet needs an adapter (charging head) to charge. However, although these devices all use the USB interface, the data cables of these devices are not exactly the same. If you go out with friends and can't find the adapter when the phone is about to run out of power, then you have to buy a new one. After all, there are many brands , these data cables are the same at the end connected to the PC, but when connecting to the device end, A variety of different interfaces are usually used for bulk reasons. Even if you look at the interfaces of the devices in your hand now, can you really name them? Make up for this missed knowledge today. Let 's take a look at the definitions and differences between common USB, micro USB and Type-C ! ! !
Three commonly used interfaces
(1) Type-A: Standard USB interface
Type-A is our most common type of USB interface and is commonly used on computers. But it has some notable problems: there are orientation requirements. The connector (male) must be inserted into the connector (female) from a certain direction, but because the two sides of the USB male port are very similar in shape, this insertion process often goes wrong.
.png)
(2) Micro: USB standard for mobile devices
Most of the current Android mobile phones use a Micro USB interface (ie, USB Micro-B), which is still widely used in various mobile portable devices.
.png)
(3) Type-C: or will become mainstream
Although Type-C appeared not long ago, it is foreseeable that with the maturity of USB Type-C technology, various notebooks, tablet computers and even smart phones in the future will begin to popularize the USB Type-C interface.
USB
USB, (English: Universal Serial Bus, abbreviated USB), and its Chinese abbreviation is "through serial line", Universal Serial Bus is a serial bus standard connecting computer systems and external devices, and it is also a technical specification for input and output interfaces. It is widely used in information communication products such as personal computers and mobile devices, and is an interface technology applied in the PC field. The USB interface supports plug-and-play and hot-plugging of the device. USB was jointly proposed by Intel, Compaq, IBM, Microsoft and other companies at the end of 1994.
The complicated interface system, coupled with the restriction that the driver needs to be installed and restarted before it can be used, will inevitably cause trouble for users. Therefore, it has become an inevitable trend to create a unified and hot-swappable external transmission interface. It belongs to the data transmission line of computer connection equipment, including double-head computer type USB universal serial bus and 1 computer type and 1 mobile phone type.
Micro USB
Micro USB is a portable version of the USB 2.0 standard, which is smaller than the Mini USB interface used by some mobile phones, saves space, has a plug-in life and strength of up to 10,000 times, and has a blind-plug structure design. The Micro-USB standard supports the current USB OTG function, that is, in the absence of a host (such as a personal computer), data transmission can be directly realized between portable devices, compatible with USB1.1 (low speed: 1.5Mb/s, full speed: 12Mb/ s) and USB 2.0 (high speed: 480Mb/s), simultaneously provide data transmission and charging, especially suitable for high speed (HS) or higher rate data transmission, is to connect small devices (such as mobile phones, PDAs, digital cameras, digital video cameras and portable digital players, etc.). At the same time, it can also provide convenience for the car, only need a USB car charger, plus a MICRO USB data cable for emergency charging of mobile phones. And there is a 5V output interface directly on the high-end car, which is connected to the MICRO USB cable to charge the mobile phone. MICRO USB is versatile and easy to use.
Micro-USB is the next-generation specification for Mini-USB, and the definition of Micro series includes Micro-B series sockets used by standard devices; Micro-AB sockets used by OTG devices; Micro-A and Micro-B plugs, and cable cable. The unique feature of the Micro series is that they include a stainless steel housing, which is not a problem for 10,000 insertions and removals.
.
Type-C
The Type-C interface, or USB-C for short, is located at the bottom of the smartphone and is mostly used for charging, data transmission and other purposes. The biggest feature of the Type-C double-sided pluggable interface is that it supports double-sided insertion of the USB interface, which officially solves the worldwide problem of "USB can never be inserted correctly". At the same time, the USB data cable used with it must also be thinner and lighter.
1. USB Type-C Ultra-thin appearance
Thinner bodies require thinner ports, which is one of the reasons why USB-C came into being. The USB-C port is 0.83 cm long and 0.26 cm wide. The old-fashioned USB port is 1.4 cm long and 0.65 cm wide. This also means that the end of the USB-C cable will be one-third the size of a standard USB-A type cable plug.
2. No positive or negative
Like Apple's Lightning port, the front and back of the USB-C port are identical. That is to say, no matter how you plug into this port, it is correct. Users don't have to worry about the pros and cons of traditional USB ports.
3. Fast
Theoretically, the maximum transfer rate of the USB-C port is 10Gb per second. But Apple says the new MacBook's USB-C port has a maximum transfer rate of 5Gbps. The maximum output voltage is 20 volts, which can speed up the charging time. And USB-A, so far the limit transfer rate is 5Gbps, the output voltage is 5V.
The emergence of the Type-C interface can be said to have saved obsessive-compulsive disorder and Virgo, and also made headaches such as "law of attraction" and "Murphy's law" disappear.