Polygonal pads
Create custom shaped polygonal pads
Polygonal pads are often required for SMD-LEDs, heatsink pads, tactile switches and so on. Click M11 on any pad in order to edit it. The Change Pads dialog opens...
In the dialog for pad edition there is a pad function:polygonal and the button [Polygon]. If you push it, the polygon editor starts.
In the polygon editor first set the grid to an appropriate size. Now move the existing black points (anchors, vertices) by drag&drop M1H. Please note the coordinates in the status line bottom of the dialog. In order to create new points, click M1 close to an edge (inner or outer) into free space. If you click M2 on an anchor a dialog appears allowing edition. Finally press [OK] to accept the polygon as new pad shape.
If the canvas of 10mm x 10mm appears to small, pleae use the box top right in order to enlarge the drawing area to max. 10cm x 10cm. Center of the canvas always is THE anchor for the pad as a whole. A drillhole will be centered there as well. The drollhole diameter defines the existence and the performance of a drillhole. Drillhole diameter =0 means: No Drillhole.
Image: With version V18 there are some additional options to specify the polygonal pad.
A user asks:
For a chip I need pads having the shape like the image. How can I do that?
Image 1: Measurements from the data sheet
Solution:
Drop any soldering pad to the layout. A double click on it opens the dialog "Change Pads". Now give the pad a rectangular shape according to the data sheet having a width of 0.63mm and a hight of 0.25mm. Set: Layer 16, copper top and Drill hole =0mm (which means no drill hole). Press OK and the pad appears in this shape. Again a double click on it and now select pad "Form": Polygonal and press button "Polygon". You get asked whether to derive the coming polygon from a former form which you confirm by "Yes" . Now your blank gets taken over to the editor. You can zoom in and out with the mouse wheel. A 2mm is optically OK here. The little black touchpad (vertex) top left of the image now can be clicked M2, in order to enter its coordinates manually.
Image 2: Edit a polygonal soldering pad. Remark: The image had been created after the pad had been generated (it is the reason why the resulting pad (blue) already has the desired form.)
Einen weiteren schwarzen Knickpunkt erhalten Sie durch einfachen Mausklick an die Gewünschte Stelle. Der neue Punkt rutscht auf den nächsten Rasterpunkt und kann nun genau so bearbeitet werden, wie eben beschrieben. Neben dem OK-Knopf im Dialog "Polygonalen Lötpunkt bearbeiten" findet sich der Knopf [Spezial]. Hier kann man auch die folgende Liste als Text einfügen (s. Pfeil im Bild unten):
Polygon [nm]
315000|125000
-175000|125000
-315000|-15000
-315000|-125000
315000|-125000
Durch duplizieren des Pads ([Strg]+[c] und [Strg]+[v]) und spiegeln an der horizontalen Achse können Sie das andere Pad erzeugen. Das geht auch im Dialog "Spezial":
Polygonales Pad spiegeln
Bild 3: Einen polygonalen Lötpunkt an der horizontalen Achse spiegeln.
Ergebnis:
Bild 4: Zwei polygonale Lötpunkte gemäß Datenblatt wobei über den Abstand der beiden zueinander im Datenblatt-Auszug keine Aussage gemacht ist.