Introduction to MCU selection method

The selection of a single-chip microcomputer is an important and troublesome matter. If the single-chip microcomputer model is selected appropriately, the single-chip microcomputer application system will be economical and reliable. If the selection is inappropriate, it will cause economic waste, affect the normal operation of the single-chip microcomputer application system, and even fail to achieve the pre-designed functions at all.

For a designed single-chip microcomputer application system, its technical requirements and system functions should be very clear. If a single-chip microcomputer with too few functions is selected, the single-chip microcomputer application system will not be able to complete the control task; but if the selected single-chip microcomputer is too powerful, this is not only unnecessary, but will also cause a waste of resources and not reduce the performance-price ratio.

As long as you master and apply the principles of correct microcontroller selection, you can choose the microcontroller that is most suitable for the application system, ensuring that the application system has the highest reliability, the best performance-price ratio, the longest service life and the best upgrading possibility.

When selecting a single-chip microcomputer chip, the general principle is:

"The chip contains (functions or quantities) slightly greater than the design requirements", "The design requirements are completed as much as possible (with) chips (using fewer peripheral devices)",

“Choose big (big factory) instead of small, choose large quantity (large supply) instead of small, choose famous (famous brand) instead of unknown (vague, unknown factory), choose cheap (modest price) but good (quality assurance).

When selecting a single-chip microcomputer, the main considerations are the technical, practical and development aspects of the single-chip microcomputer application system.

(1) Technicality: The MCU chip should be selected from the perspective of its technical indicators to ensure that the MCU application system can operate reliably under certain technical indicators;

(2) Practicality: The MCU manufacturer should be selected from the perspectives of MCU supply channels, reputation procedures, etc. to ensure that the MCU application system can operate reliably and for a long time;

(3) Developability: The selected microcontroller must have reliable development methods, such as program development tools, simulation debugging methods, etc.