Part I. The Chip AUTO-CAD TUTORIAL 1. Begin by opening the chip (DXF file), which we have arbitrarily named strip chip which will be opened in Auto-CAD. Also make sure that the chip is without pads, because the pads cause the file to open too slowly. 2. Select third option to run program and click next. 3. Click the Layout1 option in order to view the strip chip.
4. This will give you the following display. 5. Next select the units of the strip chip, by typing units in the command window and pressing enter. 6. Select appropriate units (millimeters) and click OK.
Note: This will allow you to check if you are to scale after you insert the strip chip into the chip package. 7. Next, we measure the strip chip in order to make sure it is to scale of the specified dimensions (3.9mm X 6.4mm). 8. We do this by typing dist in the command screen and pressing enter as illustrated below. The command window will as you to specify first point, you do this by right clicking the edge of a side and moving measurement line to the side end of the other edge. The results of measurement can be viewed in command window. Note: Measurements are given in polar form, the Delta Y = 0.0 because the measurement taken only in the horizontal direction. If it were taken vertically Delta X would have read zero.
Part II. The Package: 1. We open the package following the same procedures as we did with chip, the display should look like figure below. 2. This time we do not click the Layout1 option in order to view the drawing. We shall instead select the Model option selected as illustrated below. 3. To set the units, follow the same procedure as with the strip chip.
Part III. Inserting the Chip: 1. To insert chip, right click insert located in the upper left of screen and select the first option called Block. 2. Right click Browse and select appropriate file. Next select the scale size under Scale Specify X: We chose.025, because this value will allow us to be able to fit the chip into the package. Right click OK. 3. Select a portion to the side of package and right click in that spot.
4. Next measure the distance of chip to see if it is still according to scale. This is done the same as in part I section 8. The command window will as you to specify first point, you do this by right clicking the edge of a side and moving measurement line to the side end of the other edge. View the measurements below. 5. Next we shall move the chip into the package. 6. Begin by typing move in command window.
7. Select the whole chip by pressing and holding right mouse button and completely engulfing chip, similar to the way that you would copy and paste. After selecting the chip we place the mouse pointer in the center of the chip as the indicated by the arrow pointing right, and left click mouse. Chip Package Note: After left clicking in the center of the chip, a line will extend outwards in the direction that the mouse pointer is moving in, so place the mouse pointer in the center of the package as indicated by the arrow pointing downwards and left click mouse. The chip inserted in the package
Part IV. Connecting the Pins: The final part of our tutorial is connecting the chip to the pins of the package. 1. We begin selecting wire, which is the first arrow that is located in the left corner of the screen. Note: Do not click either side of mouse while connecting wires. 2. Next we zoom into drawing of chip inserted into package, by rolling scroll button of the mouse. 3. Next we connect the wire (by left clicking mouse) to the square of the chip as shown below. Note: This is a view of the chip after zooming in.
4. Next we zoom out of drawing in order to connect the wire to the pins of the package. Note: Zoom in and out as needed in order to make uniformed connections. 5. Press the escape button after each wire connection to pin. Below is an illustration of a few pin connections. Below is the finished product.