Why USB is widely used

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Why USB is widely used

USB is a new interface technology for PC applications. As early as 1995, there were already PCs with USB ports, but due to the lack of software and hardware support, the USB ports of these PCs were idle. After 1998, with the built-in support module for USB interface in Windows 98, and the increasing number of USB devices, the USB interface gradually entered the practical stage. With the popularity of a large number of USB-enabled PCs, USB has gradually become the standard interface for PCs. On the host side, the latest PCs support almost 100% of USB; on the peripheral side, devices using USB ports are also growing, such as keyboards, mice, cameras, scanners, printers, modems, digital cameras. , joysticks, TV boxes, flash memory, hard drives, even sound cards, speakers, mobile phone chargers, network cards, etc.

The reason why USB devices are widely used has the following advantages:

(1) It can be hot swapped. This allows the user to use the external device without repeating the action of "shut down the parallel port or serial cable and then turn it on". Instead, the USB cable can be plugged in directly when the PC is turned on.

(2) Easy to carry. Most USB devices are known as "small, light, and thin". For users, the same 20G hard disk, the quality of the USB hard disk is half that of the IDE hard disk. When you want to carry a lot of data with you, the USB hard disk will of course be the first. selected.

(3) Standards are unified. Commonly used are the hard disk of the IDE interface, the mouse and keyboard of the serial port, and the printer scanner of the parallel port. However, with USB, these application peripherals can be connected to the PC with the same standard. At this time, there are USB hard drives, USB mice, USB printers, and so on.

(4) Multiple devices can be connected. USB often has multiple interfaces on the PC. It can connect several devices at the same time. If you connect a USBHUB with 4 ports, you can connect 4 USB devices, and so on. There is no problem on the PC (Note: up to 127 devices can be connected).

(5) No external power supply is required. USB provides a built-in power supply that provides 5V to low-voltage devices, eliminating the need for additional power supplies for new peripherals. With this feature, some manufacturers have developed appropriate cable and used USB as a power socket, for example, as a charger for mobile phones, or as a power supply for small lamps, and for the main purpose of connecting computers. Nothing.

(6) Low cost. The USB interface circuit is simple and easy to implement, especially for low speed devices. USB system interface / cable is also relatively simple, the cost is lower than the serial / parallel port