1. Preliminary Work of Circuit Board Design
1.1 Schematic Design:
- Utilize the schematic design tool to draw the schematic diagram and generate the corresponding network table.
- In cases of simplicity, skip schematic design for pre-existing network tables.
1.2 Manual Network Table Adjustments:
- Manually modify the network table:
- Define pads not on the schematic, such as fixed pins, connecting them appropriately.
- Adjust device pin names to match the PCB package library.
- Define physically unconnected pins to ground or protection ground.
2. Drawing the Package Library of Non-Standard Devices
- Create a dedicated design file for self-drawn components within the PCB library.
3. Setting up PCB Design Environment and Drawing the Frame
3.1 PCB Design Environment Setup:
- Set up parameters such as grid size, cursor type, layout, and wiring parameters.
- Parameters can often use default values, aligning with personal habits.
3.2 Circuit Board Planning:
- Plan the board border, determining size and placement of mounting holes.
- Before drawing the border, set the current layer to Keep Out to prohibit wiring.
4. Opening Required PCB Library Files and Loading Netlist
- Open necessary PCB library files.
- Load the netlist file and modify part packages if needed.
- Netlist is crucial for automatic routing and acts as the interface between schematic design and PCB layout.
5. Arranging Part Package Positions (Part Layout)
- Utilize Protel99 for automatic or manual layout.
- Consider mechanical structure, heat dissipation, and electromagnetic interference during part layout.
- Use new interactive layout options for efficient arrangement.
6. Making Adjustments and Locking Devices
- Adjust layout as needed considering mechanical, heat, and electromagnetic factors.
- Add fixing screw holes, test pads, and adjust via hole sizes.
- Lock all devices after adjustments.
- Use VIEW3D function to check the actual effect and save the design.