PCB Technical - Complete PCB production process (engineering PCB design)

1. Schematic component PCB design

If there are required components in the PROTEL component library, you can directly find out and put them in the schematic diagram. If there is no required component, you need to create a new principle component library (Sch.lib). Process: In the original Find the component 1 with the same (or similar) number of pins as the required component in the component library, first place the component 1 in the schematic editing area (ie Schdoc file), click the component, and execute the menu command

Edit|Copy, the cursor becomes a cross cursor at this time, move the cursor to the component, click the mouse to determine a reference point. Then switch to the Sch.lib file to be edited, and create a new device in the file (shortcut key creat component) and modify the name. Click SCH Lib in the lower right corner of the environment,

move the mouse cursor to the empty component name, click the right mouse button, execute the Paste command in the pop-up shortcut menu, and paste the component 1 to the newly created component Then modify the pin attributes.

Then execute the menu command Report|Component Rule Check to perform a regulatory inspection.

2. Schematic PCB design

Create a new schematic file-->load the component library (including loading the component library created by yourself)-->place the component-->the schematic wiring output device report<--correct the error--comile all projects<-set the compilation error report first Option (Reports/Bills of Materials) output network report (if there is no hierarchical schematic diagram, you can only generate a single document network report Design/Netlist For Document/Protel If there is a hierarchical module diagram, you need to generate a project network report Design/Netlist For Project /Protel) In the schematic PCB design, if the circuit diagram is more complicated, you can use the hierarchical schematic PCB design from top to bottom (or bottom to top).

3. Component PCB package PCB design

You can use a component of the same (or similar) package to perform simple attribute modification to obtain the required component package. The specific operation process is the process of copying and modifying the component package from .PCBdoc to .PCBlib. No more Go into details.

After the component package is modified, execute Edit/Set Preference/pin 1 to set the package reference point at the first pin. Then execute Report/Component Rule check to set all the rules to be checked, and OK. At this point, the package is established.

4.PCB design

First create a new PCB file, and import the netlist when the package lib has been loaded.

Automatic component layout. Before this step, you must first set the size of the PCB, and plan the size and shape. Click on the bottom to select keep-out layer, then in the place menu, select Draw Line, and then draw a rectangle on the black baseboard, and choose the size by yourself.

Note: The line drawn at this time is pink! This shows that the size of the circuit board is planned in the keep-out layer.

Then automatic layout, routing can proceed smoothly.

Execute Tools/Auto Placement/Auto Placer for automatic component layout. If you do not perform the above operations, the No valid keepout is defined on this board. Autoplacement cannot proceed. status will appear.