The main content of this section is to outline the process of circuit board design in the development of a single chip microcomputer project.
Obviously, almost everything in a single-chip microcomputer project is based on the circuit board. The single-chip microcomputer and various components are welded on the circuit board, and the program is written in the single-chip microcomputer on the circuit board, so the design and manufacture of the circuit board is the foundation of the single-chip microcomputer project.
The first step is to make the process clear. The above picture shows the general process of circuit board design. In fact, circuit board design is not difficult. Usually, the component library of each component to be used is first drawn (the component library includes the principle library and the package library), then the schematic diagram is drawn, then the first draft of PCB diagram is generated according to the schematic diagram, and then the final PCB diagram is finished by layout and wiring. This is the whole design process.
Draw catalog:
Circuit board design generally includes these elements: components, layout and wiring, in which components are the foundation, just like bricks when we build high-rise buildings. A building can’t be built without bricks, and a circuit board can’t be made without components.
Protedxp comes with a part of the catalog, but it may not completely cover the design requirements, so it is often necessary to design its own catalog.
The design of component library includes two aspects: drawing principle library and packaging library. To do these well, it includes several tasks: drawing principle symbols of components, packaging design and binding of components.
The principle gallery is a collection of principle symbols of each component, and the principle symbols of each component contain information such as the name, shape and pins of the component.
Package library is a collection of information including the installation and welding of various components on PCB. Simply put, the package of components is the part where the components and the circuit board are welded together, including the components’ shapes, pads, soldering pads and other elements.
Binding means that when the principle symbols and packages of components are drawn, they need to be bound together, so that they can call each other, and then the subsequent schematic diagram and PCB diagram can be drawn conveniently.
Draw circuit schematic diagram:
The circuit schematic diagram is a principle-level drawing for the whole circuit to be better understood and read. Drawing the circuit schematic diagram is to organize the hardware needed on the circuit board (generally represented by the principle symbols of components) according to the rules and draw it on the diagram. Schematic diagram is not a real circuit board diagram. For many experts, it may be possible to draw PCB drawings directly without schematic diagram, but for most developers, schematic diagram is very meaningful for design and inspection.
Drawing the schematic diagram mainly includes several aspects, such as component placement, component layout and wiring.
Draw PCB diagram:
The final circuit board design has to draw PCB drawings. The PCB diagram basically means that the circuit board is exactly the same. The printed circuit board is exactly what it is, and it contains information such as the installation position of components, soldering pins, wiring between components, etc.
Drawing PCB diagram includes these tasks, such as component placement, component layout, and wiring. Components here refer to the packaging of components. Many factors need to be considered in the layout of components, such as the shortest connection, high and low frequency isolation, modulus isolation, etc. When connecting, it is also necessary to consider different line widths, line spacing, optimal routing and other factors for different devices.
Usually, the design of the circuit board basically covers these contents, but these works are based on rich knowledge of electrical, analog and digital circuits, and it takes time to do well. If you need pcb circuit board design, pcb proofing and smt patch production, please consult the customer service continuously.
