PCB News - Common problems in the use of ORCAD

1. What is FANOUT wiring?

FANOUT wiring: extended pad type wiring.

In order to ensure the mounting quality of SMD devices, generally follow the principle of not punching holes on the SMD pads, so fanout wiring is used to extend a small section of wiring from the pad of the SMD device, and then place VIA to play on the pad. The role of punching. In LAYOUT PLUS, use AUTO/Fanout/Board to realize fanout wiring. The parameters of FANOUT must be set first. Before automatic routing, the SMD components on the PCB board should be FANOUT routing.

2. Hierarchical schematic, select, right click, Descend Hierarchy, an error occurs: Unable to descend part.?

It is recommended to reset the level and reset the attributes.

3. What is the concept of hierarchical schematic diagram?

Hierarchical circuit is to use the frequently used schematic diagram (such as half adder) as a module, which can not only make the design layout concise, but also facilitate other design references

4. Now there are four modules on the top-level map. After selecting any module, right-click and select Descend Hierarchy to enter the sub-map. Now that the sub-map has been drawn, how to automatically generate PORT in the top level? Instead of adding PORT one by one? (Port has been placed for some pins in the sub-picture)

The module PIN pin of the hierarchical circuit diagram should be placed by yourself. After selecting the module, use the place pin shortcut menu. Automatically should not be possible.

5. I just want to output the gerber file separately without any layer of the board frame. What should I do?

I found that in the template that comes with the layout, there are some definitions of the board frame and size, all in the notes layer. So you can also try to set the obstacle type to board outline separately and the obstacle layer to notes when setting the board frame. Of course, you must add the notes layer in the layers dialog box, and then output the notes layer gerber file separately.

6. Questions about DEVICE generated by ORCAD

When using ORCAD to export the DEVICE file, it only defaults to the PIN connection of the component shown on the schematic diagram. The floating PIN is not counted in the PINCOUNT in the DEVICE, and the number of component PINs cannot be determined (due to the floating, it is not displayed)., It is easy to make mistakes when doing encapsulation, if there is no DATA SHEET. How can we avoid this problem? How to display all PINs of components in ORCAD?

Is there any relationship between the schematic pin and the package pin? Of course, packaging can not be done by looking at the schematic diagram. Find DATASHEET to build a package library

7. How to add new components in orcad

Method 1: After adding components in the schematic diagram, ECO to LAYOUT diagram.

Method 2: Use the TOOL--->COMPONENT--->NEW function to add components directly in the LAYOUTL diagram.

8. How to change the PIN's "NAME", "NUMBER" font size, PIN length, and GRID spacing in ORCAD V9.23?

The length of the pin: select the component and click the right mouse button, edit part, and select the pin/edit properties/shape. The font size of name and number is fixed and cannot be modified.

9. ERROR: [DRC00031]

Package has same name but different source library

What is the reason for this?

There may be two components using the same component number. (How do I think: the same package comes from different source link libraries?)

10. The problem of copy component handling in capture

My picture is copied from other *.DSN pictures. Other people's pictures only have *.DSN and *.opj files. After copying, I found that the source library and source package in the part attributes above cannot be changed. I read the information in the capture and it says Caution: An attached schematic folder or other file external to the project or library is not stored with the project or library. If you copy or move the project or library to a new location, you must also move or copy the attached object to keep them together. In addition, you may need to edit the path to the attached schematic folder or file if you move the project to a new location with a different directory structure.

The main idea is that when copying, there are other attachments that should be copied together, and then modify the path. I would like to ask, in my current situation, what should I do, input the components one by one, or there are other good ways.

No more information can be obtained from the original file of ps, copy.

There is no need to change it. The netlist information transmitted from the schematic to the PCB LAYOUT is only PART REFERENCE and PCB FOOTPRINT. You only need to change the FOOTPRINT NAME. As for whether the SOURCE LIB and SOURCE PACKAGE can be changed, it doesn’t matter (Note: only your components SOURCE PACKAGE will only be used if the PCB FOOTPRINT item is empty)

11. Excuse me, when I am drawing a circuit diagram, because this circuit diagram was given to me by someone else, I need to modify it, but there are some components in the component library. How can I operate to get the components I want faster? Don't want to copy; it's because this component was created incorrectly. If the components in this circuit diagram have fewer PINs, how can I add them?

Select the component, then right-click and select edit part to modify it

12.Why does the delete pin appear to be deleted along with the vitality component?

It may be that you have selected the component, pay attention to see if there is a dashed frame around the component

13. Is there any quick way to package and output all components?

The schematic diagram is orcad/capture, plus powerpcb

Use the BOM output to add {PCB FOOTPRINT} to the COMBINED PROPERTY STRING item

14. My prawns, how does orcad import powerpcb?

tools/create netlist/other/padspcb.dll, change the suffix of the output file name to .asc.

15. Appears when capturing DRC: Off-Grid Objects

Off-Grid Objects appears in the session log. I read the help file, but I still don’t understand what Off-Grid Objects are. Reporting Off-Grid Objects

R78-08-POWER/LED/JTAG/CLOCK/OM (177.80, 222.50)

C128-08-POWER/LED/JTAG/CLOCK/OM (93.98, 49.53)

C129-08-POWER/LED/JTAG/CLOCK/OM (106.68, 49.53)

R81-08-POWER/LED/JTAG/CLOCK/OM (35.31, 271.78)

F1-08-POWER/LED/JTAG/CLOCK/OM (59.18, 38.10)

R75-08-POWER/LED/JTAG/CLOCK/OM (152.40, 208.53)

C121-07-LCD (137.16, 133.48)

After turning off snap to grid, the components are not placed according to the grid. So statistics will appear such a prompt. Is there a way to modify the not off-grid device?

The solution is to turn off this option in erc

16. When using CAPTURE, I first drew a component and put it on the diagram. Later, I got a problem with the first drawing, so I went back to the component library and modified it. When I returned to the schematic diagram, I couldn’t change the new component. Put it up, it still uses the original one, I think it should be updated! Can someone help?

Click on the component on the drawn schematic, and then right-click the pop-up menu. There is an edit part function. After you enter it, you can modify it. After the modification is completed, you can update the current. It must be changed.

17. For the CAM output file, why doesn't it seem to see anything on the power and ground layer? Is it the same for all PCB board CAM output?

What you can see should be a crossed pad

18. Does anyone know how to convert PADS files into ORCAD files? If so, please enlighten me! ~! thanks

Export the PADS file to ASC format, and it should be ready to be imported in ORCAD.

19. I used Orcad to draw the schematic and want to use Powpcb to draw the PCB. The question now is how to add the package library of the components in Orcad, so that Powpcb knows what package it uses

Are these PCB packages drawn in Orcad or in Powpcb? Especially a new package named by myself, the package is drawn in POWERPCB. Set the FOOTPRINT of each component in ORCAD's CAPTURE to be the same as the package name in POWERPCB

For details, please refer to "Using Orcad for Schematic Diagram and PADS Layout"

20. I plan to use ORCAD as a schematic diagram, and then create a netlist of allegro, but when I add a component library, I find that I can add *.olb and *.lib libraries. What occasions are the two libraries used for?

Where can I see the component package library in allegro?

*olb is the graphic symbol library file, which is the principle library, *.lib is the simulation model description library file, uses Spice language to define and describe the functions of the graphic symbols in Capture. *.llb is a PCB package library file.

The above is the introduction of common problems in the use of ORCAD. Ipcb is also provided to PCB manufacturers and PCB manufacturing technology.