First, preliminary preparation
Including preparing component library and schematic diagram. Before PCB design, the schematic diagram SCH component library and PCB component packaging library should be prepared first. The packaging library of PCB components is best established by engineers according to the standard size data of the selected devices.
2.。 PCB structure design
According to the determined circuit board size and mechanical positioning, the PCB frame is drawn in the PCB design environment, and the required connectors, keys/switches, screw holes and assembly holes are placed according to the positioning requirements. Give full consideration to determine the wiring area and non-wiring area (such as how many areas around the screw hole belong to non-wiring area).
3.。 PCB layout design
Layout design is to place the device in the PCB frame according to the design requirements. Generate netlist in schematic tool (design → create netlist), and then import netlist in PCB software (design → import netlist). After the network table is successfully imported, it will exist in the software background. All devices can be called out by placing operation, and there is a flying wire connection between pins. At this time, the device layout can be designed.
For example: automatic wiring and automatic layout in PCB design.
These are two tools widely used by many beginners: automatic wiring and automatic layout. But please be very careful. Using them in projects is not ideal.
Auto-sending is the process that the software sends all the tracks for you.
Several softwares have automatic routers, but when using this tool, we noticed the chaos on the track. Although the software has an excellent tracking and routing system, we realize that it is risky to use it for this purpose.
In addition to its risks, many designers do not recommend or use it because the software itself does not know the operating characteristics, signal levels, electronic component specifications and other characteristics that affect the path organization.