PCB layout rules:
1.Under normal circumstances, all the components should be arranged on the same side of the circuit board, only the top components are too dense, can arrange some highly limited and the heat of small components, such as chip resistors, chip capacitors, paste IC and other on low-level.
2.Under the premise of ensuring the electrical performance, the components should be placed on the grid parallel to each other or vertical arrangement, in order to be neat and beautiful, in general, do not allow components to overlap; components arranged in a compact, components in the entire layout should be distribution, density, and consistency.
3.Different components on the circuit board near the pad between the minimum spacing should be 1MM.
4.Away from the edge of the circuit board, generally not less than 2MM, the best shape of the circuit board is rectangular, the aspect ratio of 3: 2 or 4: 3.Circuit board is larger than 200MM by 150MM, should consider the circuit board can withstand mechanical strength.
PCB layout design to analyze the circuit board unit, based on the function of the layout design, the layout of all the components of the circuit, to comply with the following principles:
1.According to the flow of the circuit arrangement of the location of each functional circuit unit, so that the layout of the signal flow, and make the signal as consistent as possible.
2.The core components of each functional unit as the center, around it to the layout. Components should be uniform, overall, compactly arranged on the PCB, minimize and shorten the leads and connections between the various components.