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OrCAD is a suite of tools from Cadence for the design and layout of printed circuit boards (PCBs). We are currently using version 9.2 of the OrCAD suite. This document will give you a crash course in designing an entire circuit board from start to finish. This will be a very small and simple circuit, but it will demonstrate the major concepts and introduce the tools behind completing a PCB design. After you have completed this tutorial, you will know all the steps needed to make PCBs using OrCAD. This is not, however, a guide to the inner workings of the OrCAD interface. You should use this document in conjunction with the online OrCAD help and tutorials. It is helpful to be very organized when you are designing. OrCAD will create many files and if you keep all of them in the same directory, it can quickly become very confusing. I like to make a directory hierarchy and put associated files into subdirectories. Before beginning, navigate to the directory in which you will keep your project and create the following subdirectories: sch – for your schematics. lib – for symbol and footprint libraries. board – for your board files. comps – for component datasheets. assy – for assembly related documents. Starting a New Schematic Project To create a new project, first start OrCAD Capture and click File -> New -> Project. You will see the following dialog box. Browse to the sch directory that you created and name the project Elec424Tutorial. You now have an empty project workspace. You should see an empty schematic page and a project window like the following. Creating a Schematic Parts Library, Creating Schematic Symbols. To add a new part to your library, right-click the library file and select New Part. This will bring up a dialog box for New Part Properties, which looks like this. The default pin Shape (Line) and Type (Passive) are OK for most pin types. For clocks and active low signals you may want to use some of the other shapes. You will also want to use the type Power for power pins. When you do this, make sure that the Pin Visible check box is checked. Schematic Entry Open page 1 of your schematics by double-clicking it in the project window. This will bring up a blank page. Before we place parts, let?s do a couple of things. First, I like to make the page size a bit bigger than the default. Preparing for Layout : Now that your schematics are complete, you are ready to prepare to export the design to Layout.
Tags : orcad suite, printed circuit boards, shape line, libraries board, directory hierarchy, default pin, component datasheets, project workspace, schematic symbols, dialog box, crash course, pcb design, assy, pcbs, inner workings
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