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Effective application of single chip microcomputer scheme

2022-01-19

(1) Service life. The service life mainly refers to the following two aspects: the products developed by single chip microcomputer have good stability and long service life, and can run stably for 10 or 20 years for a long time; It has a longer service life than microprocessor. With the continuous improvement of semiconductor technology and the upgrading speed of MPU, some of them have been successfully listed. At the same time, the younger CPU cores will also be enriched with the development of I / O modules and have a long life cycle. With the emergence of new CPU products, the field of single chip microcomputer is also expanding, and the user's choice is also increasing one after another. At present, the main development trend of single chip microcomputer is the common progress of 32-bit, 16 bit and 8-bit single chip microcomputer. At the beginning, single chip microcomputer mainly started from 8 bits. With the development of multimedia technology, Internet technology and mobile communication technology, 32-bit single chip microcomputer gradually developed. For example, the 32-bit CPU single chip microcomputer mororola68k has achieved a sales volume of 80 million pieces, while the development of 16 bit single chip microcomputer has also made great progress in terms of output and variety, showing a growth trend.

(2) Operating speed. The main in the development of MUP is to continuously improve the speed, which is mainly marked by the clock frequency, which increases gradually. However, there are some differences between MCU and MUP. In order to further improve the anti-interference ability of MCU and reduce the impact of noise, MCU gradually starts from reducing the clock frequency in the development process, so it does not hesitate to reduce the operation efficiency. Starting with the internal system of the single chip microcomputer, the internal timing is changed, and the operation speed of the single chip microcomputer is further improved without increasing the clock frequency.

(3) High reliability and low noise technology. First, EFT technology belongs to anti-interference technology. It is mainly that when the sinusoidal signal in the oscillation circuit is affected by the external environment, the waveform emitted by it will be superimposed with various burr signals, and people often use Schmidt circuit for shaping in the processing process. Then the circuit oscillation burr will become a clock that triggers signal interference, The alternating use of RC filter circuit and Schmidt circuit can effectively eliminate the burr effect, make the influence invalid, and promote the smooth transmission of system clock signal. Further improve the stability of MCU. The second is the driving technology and low-noise wiring technology. The traditional single chip microcomputer usually sets the ground wire and power supply at the symmetrical pin position in the circuit shell, mostly in the symmetrical positions of upper right, lower left, upper left and lower right, so that the power noise can pass through the whole chip smoothly and interfere with the internal circuit of the single chip microcomputer. Most microcontrollers set the power pin and ground wire in two adjacent pins, which can effectively reduce the current passing through the whole chip. At the same time, decoupling capacitors can be set in the printed circuit board to further reduce the impact of noise.

(4) MCU scheme mask and OTP. OTP belongs to a single-chip with one-time input. In the past, the single-chip microcomputer that was put into production as a mask was regarded as a sign of the maturity of single-chip microcomputer products, because the mask has a corresponding production cycle, and the price of single-chip microcomputer of OTP model is also decreasing. Therefore, product manufacturing through OTP has gradually become a development trend in recent years. Compared with the mask method, it has the advantages of low risk and short production cycle. In the new era of social discovery, the demand for OTP single chip microcomputer is also rising.


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