PCB Tech - PCB circuit board drawing technology summary

Summary of PCB board drawing technology:

(1): When drawing the schematic diagram, the pin labeling must use the network. NET do not use the text TEXT, otherwise there will be problems when guiding the PCB design

(2): When drawing the schematic diagram, all components must be packaged, otherwise the components will not be found when the PCB is guided

Some PCB components cannot be found in the library and I have to draw them by myself. In fact, I still draw them myself. Finally, there is a library of my own, which is convenient. The drawing process is to start FILE/NEW--"Select SCH LIB--"This will enter the part editing library--"After drawing, click TOOLS-RENAME COMPONENT to rename the component.

The picture of the component package is the same as this one, but the PCB LIB is selected, and the border of the component is on the TOPOverlay layer, which is yellow.

(3): After drawing, rename the components in order, select TOOLS tool ---- "ANNOTATE annotation and then select the order

(4): Before converting into PCB, report should be generated, mainly netlist. Choose DESIGN design----》Create Netlist to create netlist

(5): Another thing is to check the electrical rules: select TOOLS. >ERC

(6): Then the PCB can be generated. If there is an error in the generation process, the schematic must be corrected and then the PCB is generated.

(7): The PCB must first make a good game. The line should be as short as possible, and the number of vias should be as few as possible.

(8): Design rules before drawing the line: TOOLS-Design Rules, GAP design of Clearance Constrain in Routing, 10 or 12 can be selected, vias are set in ROUTING VIA STYLE, the maximum outer diameter of the Hanpan is the smallest The size of the outer diameter, the largest inner diameter, and the smallest inner diameter. WIDTh Constraint sets the width of the line, maximum and minimum

(9): The width of the drawn line is generally 12MIL, the peripheral power and ground line is 120 or 100, the power and ground of the chip are 50 or 40 or 30, and the crystal line should be thick and placed next to the microcontroller. The public line should be thick, the long-distance line should be thick, the line cannot be turned at a right angle, and the line should be 45 degrees. The power supply, ground and other signs must be marked in the TOPLAY to facilitate the debugging of the connection.

If you find that the diagram is incorrect, you must first modify the schematic diagram, and then use the schematic diagram to change the PCB.

(10): The bottom option in the VIEW option can choose inch or millimeter.

(11): In order to improve the anti-interference of the board, it is best to apply copper last, select the copper-plated icon, and a dialog box appears. In the figure, Net Option selects the connected network, and the two options below should be selected, HATCHING STYLE, Choose the form of copper coating, this is arbitrary. GRID SIZE is the spacing of copper grid points. The TRACK WIDTH set line width should be consistent with the PCB line width we drew. LOCKPrimitives compare and choose, and the other two can be done as shown in the picture.

The above is a summary of PCB circuit board drawing technology