Lesson 5: Creating Heterogeneous Parts - EMA Design Automationeducation.ema-eda.com/iTrain/Capture166/Lesson5_Capture... · 2013. 1. 3. · Getting Started with OrCAD Capture OrCAD

Getting Started with OrCAD Capture OrCAD Capture Version16.6

EMA Design Automation 131

Lesson 5: Creating Heterogeneous Parts

Lesson Objectives

After you complete this lesson you will be able to:

Create a Heterogeneous part

Annotate a Heterogeneous part (Optional)

Heterogeneous Parts

A heterogeneous part is a part that has two or more unique part graphics or pin count. It

could have a different number of pins in each “gate” or part. Any part with a pin common

to all the other gates must also be defined as a ‘Heterogeneous” part.

The following part displays each gate with a different number of pins in the gates as

Power & GND are displayed on only the first gate.



A heterogeneous part must be defined as multi-section (Parts per Pkg is set to two or

more). Each part graphic represents a different portion of the entire package.

For example, an OPAMP may have 4 gates but only the first gate contains the Power

and/or Ground pins. You define this heterogeneous part as having four parts per package.

In the Part Editor, use the View - Next Part command to create three unique part

graphics, as shown in the previous graphic.

Annotating Heterogeneous Parts

When a heterogeneous part is used in a design, OrCAD Capture needs a property to

indicate which part graphics go together in a package. This is required for

Heterogeneous parts only when you use the Annotate command.



Lab 5-1: Creating a Heterogeneous Part -

LM342

Lesson Objectives

After you complete this lab you will be able to:

Create an heterogeneous part

Understand how to Annotate

1. If a library is not still open in OrCAD Capture, select and open the TRNG.OLB

library you were working with.

2. Highlight the library name and from the right-mouse button pop-up menu select New

Part.

3. Enter the information as shown above.

4. Click OK.



Creating the Symbol for the first gate

1. Set your window to full, then select View - Zoom - All (or click the button in the

toolbar) to adjust the view.

2. Using the Place Polyline command (see the Toolbar); draw some triangular graphic as

shown in the next image.

So that the Power and Gnd pins will eventually fall on a grid, use a 4X5 grid.

Remember to use the Shift key while drawing in order to angle the poly-line.

Adding Pins for the first gate

1. Click the Place - Pin button.

2. Enter the information shown in the following picture, then click OK.



3. The pin image appears, attached to the cursor. Position it as shown in the following

picture, and click to place it.

4. Continue to add pins to achieve the follow image.

Next pin: Name ( - ) Next pin: Name ( OUT )

Number ( 2 ) Number ( 1 )

Type ( Input ) Type ( Output )



5. Use the line graphics command to draw a short “stub” from the edge of the triangle

graphics to the edge of the bounding box. See the following graphics.

6. Make sure you turn off “Snap to grid” to do this. Turn it back on when you finish.

Place the Power pins

1. Select Place - Pin.

2. Enter the information shown in the following picture, then click OK. Use the pin

shape (Zero Length) and place it at the end of the line graphics you used to draw the

pin stub from the triangle graphics.



3. Place the V+ Power pin at the top edge of the bounding box.

4. Place the V- Power pin at the bottom edge of the bounding box.

5. Select Options - Part Properties.

The User Properties dialog box reappears.

6. Select the Pin Names Visible option, then toggle the value to False, as shown in the

following graphic



7. Click OK.

8. Repeat the previous steps (5 & 6) and make the Pin Names visible again.

9. Select Options - Part Properties, and add a GROUP property to the part. Leave the

Value field blank and use the Display button in the User Properties form to make the

property visible.

The part should look like the following picture.



10. Select File - Save.

Creating the Symbol for Section Two, Three, and Four

1. Select View - Next Part.

2. Using the skills you learned above, create the next sections in the package. What

makes this section unique from section one is that the next 3 “gates” do not have the

PWR/GND pins shown.

Please refer to the following diagram for the pin names and numbers in the other

“gates”.

Gate B Gate C Gate D

+ = 5 + = 10 + = 12

- = 6 - = 9 - = 13

OUT = 7 OUT = 8 OUT = 14

3. Close and Save the library part.

4. File - Close the library.



Lab 5-2: Annotate the LM324 Part

(Optional)

The following lab is only for testing your Heterogeneous Parts using the Annotate

command.

1. Select File - New Design. (As this is only to illustrate how to annotate your

Heterogeneous parts, we will not use the formal settings for an .OPJ file.)

2. Make sure you are in the D - EMA_Training -Capture directory for this

exercise.

3. When the page is open add the following gates to the page.

4. Select Place - Part.

5. When the Place - Part tab opens, add the TRNG.OLB to the search path.

6. Now select the LM324 part from the TRNG.OLB library, as shown below:



Notice that the Packaging section of the Place Part form shows four parts per package.

The Part field defaults to A, or section one of the package.

7. Place the part on the schematic page.

8. Add three more sections of the LM324 package into the schematic by toggling the

Part field in the Place Part form to B, C, & D.

9. Repeat this until you have about 8 or 10 different “gates on the page. Remember you

can use COPY/PASTE to achieve some of this.

10. The page may look something like the following picture. It is not important how

many of each gate type is placed.

11. Select four gates, one of them being an “A” gate.

The “squares” and “circles” were added to the picture to show which gates were grouped

together in the example.



12. Click right and select Edit Properties from the pop-up menu.

13. In the Property Editor window, select the “New Row” or “New Column” button in

the top-left of the Property Editor window.

14. Enter the new GROUP property.

15. Now select the GROUP row and from the RMB popup menu select Edit. Set the

GROUP property value to 1 for the row.

Refer to the following illustration to see how this can be done.

16. Click Apply and close the Property Editor.

17. Repeat this process until you have assigned all the gates to groups.

18. Now, in the Project Manager window, highlight the design name.

19. Select Tools - Annotate.

20. Under Physical Packaging, add the GROUP property to the end of the Combined

Property String.

21. Be sure to enclose the property name in curly braces, as shown in the following

graphic.



22. Click OK.

23. Check the schematic to see if the sections of the LM324 parts were placed into the

same package (same reference designator).



24. Close the test schematic but do not save it.

If the GROUP property had not been added to the Combined Property String, it would

have been ignored during annotation, resulting in two separate LM324 packages.

To pin swap in the OrCAD and Allegro PCB Editor, the SPLIT property must be added

to all sections of a heterogeneous part. Give the SPLIT property a value of TRUE. There

must not be any duplicate pins across the sections of the split part.

25. When you are done testing the part, exit the “design” but do not save it.

Documents

Lesson 5: Creating Heterogeneous Parts - EMA Design Automationeducation.ema-eda.com/iTrain/Capture166/Lesson5_Capture... · 2013. 1. 3. · Getting Started with OrCAD Capture OrCAD