Since Protel99 SE software differs from Protel 98 and other programs, we will first provide a brief overview of the PCB design process using Protel99 SE.
1. Protel99 SE utilizes a project (PROJECT) database management system, which is integrated within the Windows environment. Therefore, the first step is to create a database file to manage the schematic and PCB layout you will design.
2. Next is the schematic diagram design. To establish network connections, the components used must be present in the component library during the initial design phase. If certain components are unavailable, they should be created in SCHLIB and stored in the library file. You can then easily retrieve the required components from the library and connect them according to the schematic diagram.
3. Once the schematic design is finished, a netlist can be generated for use in PCB design.
4. PCB design.
a. **Determining PCB Shape and Size.** The PCB’s shape and dimensions are dictated by its position within the product, available space, and its integration with other components. Utilize the PLACE TRACK command to outline the PCB’s appearance on the MECHANICAL LAYER.
b. **SMT Requirements.** Positioning holes, alignment markers, and reference points must be incorporated into the PCB as per SMT specifications.
c. **Component Creation.** If any specialized components are required that aren’t available in the component library, they must be created before layout. The component creation process in Protel99 SE is straightforward. Start by selecting the “MAKE LIBRARY” option from the “DESIGN” menu to access the component creation window. Then, choose the “NEW COMPONENT” option from the “TOOL” menu to design the meta Device. Here, draw the appropriate pad at a designated location using PLACE PAD and other commands on the TOP LAYER according to the actual component’s dimensions. Edit the pad to meet the necessary specifications (including pad shape, size, inner diameter, and angle), and label the corresponding pin names. Next, use the PLACE TRACK command to sketch the component’s maximum outline on the TOP OVERLAYER and assign a component name before saving it to the component library.
d. **PCB Layout and Routing.** Once the components are created, the next step is the PCB layout and wiring, which will be detailed further below.
e. **Inspection Process.** Following the above steps, a thorough inspection is essential. This includes verifying the circuit schematic and checking for compatibility and assembly issues among components. The circuit can be validated either manually or automatically by comparing the network formed by the schematic with the network derived from the PCB.
f. **File Archiving and Output.** After ensuring correctness through inspection, archive and export the file. In Protel99 SE, use the “EXPORT” command found under the “FILE” menu to save the file at a designated path. Note that the “IMPORT” command allows you to bring a file into Protel99 SE.
**Note:** When using the “SAVE COPY AS…” function in Protel99 SE, the selected file name may not be visible in Windows 98, rendering it undetectable in Explorer. This differs from the “SAVE AS…” function in Protel 98.
