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Hello everyone, in this lesson we will introduce the USB interface

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The USB interface is a very widely used interface

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It has many protocols and interfaces

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Common interface types include Type-A, Type-B and Type-C, etc.

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The most common type of USB interface on the mainboard is the Type-A interface shown on the right

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The Type-A interface can be divided into USB2.0 and USB3.0 according to the number of internal pins

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The characteristic of the USB2.0 interface is that there are only 4 pins inside the interface.

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The USB3.0 interface is characterized by adding 5 pins on the basis of the USB2.0 interface.

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Moreover, the color of the USB interface also has a certain relationship with the type of USB interface.

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For example, like a USB2.0 interface, its color is generally black and white

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The most common on the mainboard is black

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And other non-black interfaces, such as blue, red, etc.,

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they are basically USB3.0 interfaces

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The transmission speed of the USB3.0 interface is much faster than that of the USB2.0 interface

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Next, let's take a look at the pin definition of the USB interface

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Let's first look at the pin definition of USB2.0

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USB2.0 has four pins, which are power supply, D+, D- and GND

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Needless to say, power supply and grounding

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D+ and D- are USB data lines

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Take the solder joint of the interface on the right as an example

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The above four solder joints are the solder joints of USB2.0

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They are power supply D-, D+ and GND respectively

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The USB3.0 interface has 5 more pins

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The middle pin is grounded, and the remaining four pins are USB3.0 data lines

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They are send+, send-, receive+ and receive-

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Well, the above is the introduction and pin definition of the USB interface