Step 6: Set Up Device Families My test case was a PIC16F1947. This chip is actually part of a family of two devices, the other being the PIC16F1946. The ’46 is identical to the ’47, with the exception that it has half the amount the flash and data RAM. The chips are also both available in a low-power variant, designed as 16LF instead of 16F. How do I make EAGLE recognize that? The procedure is actually fairly simple. EAGLE uses a simple wildcard system in the part name that substitutes available technologies (F or LF in this case) and variants (where the part number might be slightly different).

An asterisk in the device name will be replaced with the selected technology, and a question mark with the variant name. So the first step is to rename the part. To do this, you first open it, and then select Rename from the Library menu. In my example, I changed it to “PIC16.F194?”.

EAGLE by default has an empty technology (shown as ” in the Technologies dialog), and the part is imported with a single, un-named variant. To name the initial variant, select it in the list on the right-hand pane, right-click, and select Rename. I entered 6 for the initial variant name. Looking in the description pane, I now had a single part listed in the table (PIC16F1946). I also want an LF version of this part, so I next clicked on the Technologies link in the description pane. This produces the dialog shown at right; enter L in to the “New” text box, and click OK.

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Now I’ll see two entries in the table: PIC16F1946, and PIC16LF1946. And that’s it for the ’46; everything is there, right?

Now all I have to do is add a variant for the ’47. To accomplish this, click the New button at the bottom of the right-hand pane. You’ll then need to select the package for your new variant, ensuring it’s the same as for the existing one. Enter the new variant name ( 7 for my new variant), and click OK. The only catch is that you’ll see a warning icon in the variants list because none of the pins are mapped between the symbol and the package. Fortunately, this is easy to fix. To correct it, double-click the variant.

Rather than manually assigning the pins, you can copy them from the existing variant by selecting it in the Copy From: dropdown (which is less than obvious because it’s poorly labeled). Select the variant to copy from, and click OK. With these steps completed, and your new variant selected in the list on the right, you’ll see a single part listed in the table in the description pane: PIC16F1947. EAGLE assigns technologies on a per-variant basis, so you’ll need to click the Technologies link again, and check the box next to L. When you click OK, both the F and LF variants will appear in the list.

Step 7: Finishing The Job Actually, you’re mostly done at this point. The only other tweak I had to make on my sample part was to move the symbol in the device editor. By default, the editor centers the part on the symbol’s mark, which will be at the location of pin 1.

Fixing this is simple: click the move tool, click pin 1, drag the symbol where you want it, and click again. Now save your library, and your part is ready to use. While Ultra Librarian doesn’t do a very good job with labeling and whatnot, the important parts (pad layouts and the like) seem to be pretty solid.

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It’s also a lot easier than it looks; once you know what needs to be done, it only takes a few minutes. Much easier than generating everything by hand!

The tool does the hard work for you, and you can use that as a starting point for your own library components. Even if you want to, say, group the pins by function in the symbol, having them already defines makes this much easier to do. And the best part?

You can get.blx files for just about every chip Microchip makes.

For Mac Users From the Advancement Resources page:. Ensure you have. Press your “control” key and at the same time (while pressing the “control” key), click on this workbook link:.

Once the dialog box appears, click on “Save link as.”. Another dialog box will appear for you to name your “save as” file and to choose where you would like to save the file. Once you have saved the workbook to your computer, open Adobe Reader.

From within Adobe Reader, click on “File,” click on “Open,” enter the saved file name, and then enter or click “Open.” Note: A web browser or Preview.app won’t display the PDF correctly and will instead display the message “To view the full contents of this document, you need a later version of the PDF viewer.” The workbook must be saved to your computer and opened with or later. This enables the user to take advantage of the enhancements of expandable text boxes and importing images.