PCB wiring In PCBA chip processing, PCB wiring is a crucial link, which is related to the performance, stability and reliability of the circuit board. In order to ensure the quality of PCB wiring, certain specifications need to be followed. Next, we will discuss the specification of PCB wiring in detail from several aspects.
1.Follow the electrical performance requirements: The wiring should meet the electrical performance requirements of the circuit, such as signal transmission speed, impedance matching, noise suppression, etc.
2.Reasonable layout: The layout of components should be reasonable, easy to wiring, and consider factors such as heat dissipation and maintenance.
3.Concise wiring: The wiring should be as concise as possible, reducing unnecessary bends and crossings to reduce signal loss and interference.
4.Safety: The safety of the circuit should be considered in the wiring, such as avoiding potential safety hazards such as short circuit and overload.
1.Wiring width: According to the current size and the heat dissipation capacity of the PCB board, the wiring width is reasonably selected. In general, the power cord should be appropriately widened to reduce voltage drop and heat generation.
2.Wiring spacing: The wiring spacing should meet the electrical safety requirements to avoid interference between adjacent lines. For high-frequency signal lines, the spacing should be increased appropriately to reduce crosstalk.
1.Classification of ground wires: According to the function of ground wires, they are divided into protected ground, signal ground, etc. The different ground wires should be arranged separately and finally grounded through a point.
2.Ground width: The width of the ground wire should be sufficient to reduce the ground impedance and improve the stability of the circuit.
3.Ground Loop: Avoid the formation of a ground loop to reduce electromagnetic interference and ground noise.
1.High-frequency lines: High-frequency lines should be as short and straight as possible, with less bends and crossings. At the same time, shielding measures are used to reduce external interference.
2.Sensitive lines: For sensitive signal lines, such as analog signals, low-level signals, etc., measures such as isolation and shielding should be adopted to reduce noise and interference.
3.Power lines: Power lines should be as wide and short as possible to reduce voltage drop and heat generation. For high-power circuits, heat dissipation should be considered.
1.Wiring sequence: first lay out important lines, such as power cables, ground wires, etc.; Re-distribute general lines, such as signal lines, etc. Finally, consider the distribution of secondary and auxiliary lines.
2.Routing level: For multi-layer PCB boards, the functions of each layer should be reasonably allocated according to the electrical performance and wiring requirements. For example, the power plane and ground layer are placed in the inner layer to reduce electromagnetic interference and improve heat dissipation performance.
In order to facilitate the subsequent production, maintenance and debugging work, the wiring needs to be identified and annotated after the wiring is completed. The logo should include information such as the name of the line and the function; The annotation should detail the design ideas of the wiring, special handling methods, etc.
PCB cabling specifications involve many aspects, including basic principles, wiring width and spacing, ground handling, special wiring handling, and routing sequence and hierarchy. Following these specifications ensures the quality of PCB wiring and improves the performance, stability, and reliability of the board. At the same time, in order to facilitate the follow-up work, it is also necessary to identify and annotate the wiring.