Mining chip circuit board

1. EN / SS has two functions, en is the enable of a function, SS is soft start
GND means ground
SW is switch pin
FB is feedback pin
comp is compensation pin
OSC is crystal oscillator, oscillator pin
inference chip is a synchronous buck converter chip

2. The differences between circuit boards and chips are: different boards, different layers and different uses< 1. Circuit board: the circuit board includes ceramic circuit board, alumina ceramic circuit board, aluminum nitride ceramic circuit board, circuit board, PCB board, aluminum substrate, high frequency board, thick copper board, etc
2. Chip: the chip is to make the circuit on the surface of semiconctor wafer< Second, the number of layers is different
1. Circuit board: according to the number of layers, circuit board can be divided into single panel, double-sided board and multi-layer board
2. Chips: chips are double-sided miniaturized circuit panels integrated into substrates or circuit boards
3. Different uses
1. Circuit board: circuit board is the support of electronic components and the carrier of electrical connection of electronic components
2. Chip: the chip is used to control the computer, mobile phone and other electronic precision equipment for analog and digital integration technology
reference sources:
network circuit board
network chip

3. Buy the whole circuit board
based on personal experience: da3289a1 feels that it is the internal number of the chip manufacturer, which cannot be found outside; 1637 is a chip proced in 1637 weeks.

4. There are many methods, but I don't know what conditions you have:
1. You can use a tin absorbing electric soldering iron to suck down the solder on the integrated circuit pins, and then use the electric soldering iron to heat the pins, and at the same time use a small screwdriver to gently pry down the integrated block
2. If you don't have a tin absorber, you can find a section of multi strand soft copper wire, dip it in rosin with an electric soldering iron, and put it on the pin, which can also play the role of tin absorption
3. The melting point of standard solder is 183 ℃. The circuit board can also be put into hot oil to remove the integrated chip completely
4. In fact, there are special tools for taking the manifold block. If possible, you can borrow them.

5.

The following methods can be used to remove the chip on the circuit board:

1. If using ordinary soldering iron, first wait for the soldering iron to heat, and then quickly solder the spot. Speed up, otherwise this one will be cold and that one will be hot, and it will not be removed. On the other side, gently shake it with tweezers to see if it is loose. This method is difficult to master. It takes practice

2. Use the hot air gun to adjust it to about 350 ° And blow air to the IC pin until the solder on the pin dissolves. Gently shake with tweezers to remove IC

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extended data:

1. The solderability of PCB holes affects the welding quality

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poor solderability of PCB holes will cause welding defects, affect the parameters of components in the circuit, cause the conction instability of components and wires in multilayer boards, and lead to the failure of the whole circuit function

the so-called solderability refers to the wettability of molten solder on the metal surface, that is, a relatively uniform, continuous and smooth adhesive film is formed on the metal surface where the solder is located. The factors that affect the solderability of printed circuit board are as follows:

2, the composition and properties of solder. Solder is an important part of welding chemical treatment process. It consists of chemicals containing flux. The commonly used eutectic metals with low melting point are Sn Pb or Sn Pb AG. The content of impurities should be controlled in a certain proportion to prevent the oxides generated by impurities from being dissolved by flux

the function of flux is to help solder wet the circuit surface of solder plate through heat transfer and rust removal. White rosin and isopropanol are commonly used

The weldability is also affected by welding temperature and metal plate surface cleanliness. If the temperature is too high, it will accelerate the solder diffusion. At this time, it has a high activity, which will make the surface of circuit board and solder oxidize rapidly, resulting in welding defects. If the circuit board surface is polluted, it will also affect the solderability, resulting in defects. These defects include weld bead, solder ball, open circuit, poor gloss and so on

reference source: network circuit board welding

6. As long as you know the purpose and naming rules of the chip, and then understand the function definition of each pin of the chip, you can learn the application method instead of learning a single chip. After you find a chip, you can easily find the specification. The definition of each pin is clearly written. You just need to learn how to run and use it. But it still needs a lot of circuit knowledge.

7. 1) CPU is a kind of chip with special functions, including controller and arithmetic unit. It is the central processing unit of the computer and the brain of the computer. It looks like a chip
2) MCU is a chip with CPU, memory, input and output components, timer, counter and other functions. It has the basic functions of a computer host. Because of its small size, it is suitable for embedded applications. From the appearance, it is a chip< In general, integrated circuits and chips are the same
4) a circuit board is a collection of chips (integrated circuits) working together, that is, a channel.

8. It depends on your specific goals. If you just want to learn without specific goals and just want to experience the whole process of design and development, it's relatively simple. Just choose a typical, informative and easy to buy single chip microcomputer, such as AVR series, and find a Book of AVR single chip microcomputer embedded system principle and application practice written by Ma Chao, Learning and doing is OK. If you are aiming at a specific application, you need to learn relevant MCU knowledge and development skills around the application requirements, and you may also need to refer to a large number of materials, so it is not a book or two that can solve the problem.