EE 461 Digital System Design

1
EE 461 Digital System Design

• Lecture 27
• Agenda
• Lab 9 Mentor PADS cont
• Announcements (Wednesday, 4/2)
• -

2
Mentor PADS

• Todays Lab Objectives 1) Learn how to create
  the CAM files for a layout
• Computer Aided Manufacturing - There are 3
  types of files that need to be created for a
  PCB 1) Gerbers 2) Drill Files 3) Drawings
  (Combined Fab/Drill)- today we will walk
  through the tutorial on the course website to
  create the CAM files.- it is good to check your
  Gerbers in a separate tool (i.e., PentaLogix) in
  order to independently verify that your data
  is correct.NOTE HW10 is to create a Combined
  Fab/Drill drawing.

3
Mentor PADS

• Creating Gerber Files - In Mentor PADS,
  perform File - CAM- in the dialog that
  appears, we now setup which CAM files will be
  produces.- first, setup the CAM directory. -
  create a directory in your project directory
  called "CAM" (or HW10_CAM)- how we need to
  define the following GERBER outputs top.pho
  bottom.pho top_silk.pho top_mask.pho
  bottom_silk.pho bottom_mask.pho

4
Mentor PADS

• Drill Files - In the CAM window, setup the
  Numerically Controlled Drill output files-
  click on the "Options" button to verify the drill
  sizes in your design are correct.
• Combined Fab/Drill Drawing - In the CAM window,
  setup the Drill Drawing output (to PDF)- this
  will output the contents of the Drill Drawing
  layer.- you should add - sheet border -
  board dimensions - stackup table - notes-
  the CAM output will automatically generate the
  Drill Table (although you need to enter the XY
  coordinates for where it will go).

5
PCB CAD (Drawing Example)

• Combined Fab/Drill Drawings

Stackup, Material, and Surface Finish Information
Drill Locations
Special Notes about Board
Board Dimensions
Drawing Border
Drill Table