usb circuit board

usb circuit board concept

To talk about the concept of USB circuit board, we should first say some of the concept of circuit board, circuit board has many names, we can call him PCB board, aluminum board, high frequency board, PCB, ultra-thin circuit board, super Thin circuit board, printed (copper etching technology) circuit boards. Circuit board miniaturization of the circuit, visualization, the fixed circuit for mass production and optimization of electrical layout plays an important role. Then what is the USB circuit board it, the answer is almost ready Well, that is for the USB device to do the circuit board.

USB mouse circuit board

We all know that USB is a commonly used pc interface, he has only four lines, two power two signals, as shown below. So the signal is transmitted serially, usb interface also known as the serial port, usb2.0 Speed can reach 480Mbps. Can meet a variety of industrial and civil needs .USB interface output voltage and current are: +5.. 500mA In fact, the maximum error, the maximum can not exceed +/- 0.2V that is 4.8-5.2V. Usb interface, the four lines are generally distributed as follows, it should be noted that do not put the positive and negative reversed, otherwise it will burn usb devices or computer Southbridge chip.

Then the arrangement of the USB interface is very important, let's talk about the rehearsal together:

The general arrangement is:

Red, green and black from left to right

Black line: ground gnd

Red line: power vcc

Green line: USB data line data +

White line: USB data line data-

Type A: Generally used for PC

Type B: Generally used for USB devices

Mini-USB: Generally used in digital cameras, digital video cameras, measuring instruments and mobile hard drives

Now the host has a USB interface, so USB optical storage application is extremely convenient, as an external optical storage device interface, the application is quite flexible, and no longer have to add additional equipment for the interface to reduce input. Various interfaces use the same USB logo.

Sometimes we see some GVCD interfaces on the USB mouse board, what are these interfaces, what does it stand for? Then let's take a look:

G --- GND power ground, usually black

V --- VCC positive power supply, usually red. Between the positive power supply and ground generally have a filter capacitor

C --- CLOCK clock, white

D --- DATA data, green or blue.

In addition, if there is C \ D connected to the useless situation, then try it upside down, maybe there will be unexpected surprises.