1. Follow the principle of "large before small, difficult before easy" in the layout, that is, important unit circuits and core components should be laid out first.
2. The layout should refer to the principle block diagram and arrange the main components according to the main signal flow pattern of the single board.
3. The arrangement of components should facilitate debugging and maintenance. That is, large components should not be placed around small components, and there should be enough space around components that need to be debugged.
4. For circuit sections with the same structure, a symmetrical standard layout should be used whenever possible;
5. Optimize the layout according to the standards of even distribution, balanced center of gravity, and aesthetically pleasing page layout;
6. Components of the same type should be placed facing the same direction in the X or Y direction. Polarized discrete components of the same type should also be aligned in the X or Y direction to facilitate production and inspection.
7. Heat-generating elements should generally be evenly distributed to facilitate heat dissipation of the single board and the whole machine. Temperature-sensitive devices other than temperature detection elements should be kept away from components that generate a lot of heat.
8. The layout should meet the following requirements as much as possible: the total wiring should be as short as possible, and the critical signal lines should be the shortest; high voltage and high current signals should be completely separated from low current and low voltage weak signals; analog signals should be separated from digital signals; high frequency signals should be separated from low frequency signals; and high frequency components should be sufficiently spaced.
9. The decoupling capacitor should be placed as close as possible to the power supply pin of the IC, and the loop between it and the power supply and ground should be minimized.
10. When laying out components, devices that use the same power supply should be placed together as much as possible to facilitate future power supply separation.
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