Protel DXP PCB Layout pdf

Protel DXP PCB Layout
Glenn Mercier
12/16/2005
PCB Layout Software
There are many PCB Layout software packages
available. For this tutorial, I will be using
Protel DXP.
 Protel DXP 2004
 Orcad Layout
 Eagle Layout Editor
 Express PCB
 PADS
Introducing Protel DXP 2004
Reasons for Choosing Protel DXP
 Abundance of learning luides
/>Support/LearningGuides/
 Large footprint library included
 Extensive design rule checking
(DRC)
 Integrity testing
 Integrated software package
 Free Trial Available
Main Screen
Create new PCB Project
The project
was created
(*.PrjPCB),
but needs to
be saved, right
click and save
the project

Save the PCB Project File
Create New Schematic
 Now we need to add
files to the project.
The beginning step
is to add a
Schematic
Document. This is
where the schematic
drawings we are all
familiar with will go.
Right click and save
the schematic
document as before.
Organization
 Your screen should now look like this. Notice
the branching. The PIC schematic document
is located in the project tutorial.
Libraries
 There are three forms of libraries
 Schematic Library- This library contains
schematic drawings that we are familiar with
from ORCAD
 PCB/Footprint Library- This library contains
the actual dimensions and pads for placing the
component on the board.
 Integrated Library- Most manufacturers
libraries are integrated, containing both
Schematic and PCB libraries.
Adding Libraries

 From the design menu, click Add/Remove
libraries.
Adding Libraries (Cont.)
Adding Libraries (Cont.)
 Since most of us are using Microchip PIC
microcontrollers, add the Microchip library
Adding Libraries (Cont.)
 Each manufacturer usually categorizes their
parts for easy selection. Choose the PIC18
Adding Libraries (Cont.)
 Add the highlighted libraries to the project.
These two files are not in a folder, but in the
root ‘Library’ folder
Adding Libraries (Cont.)
 From the Library folder, go to the PCB folder,
this folder contains PCB footprint libraries.
Adding Libraries (Cont.)
 From the PCB folder, add
 Chip Capacitor
 Chip Resistor
 Crystal Oscillator
 Resistor- Axial
Adding Libraries (Cont.)
 You should now have the following libraries
installed. Note the top three libraries here are
integrated libraries, and the bottom four
libraries are PCB libraries
Checkpoint
 If you expand the
libraries folder, you

should see the
following. Now that
we have added our
libraries, we are
ready to begin the
schematic layout.
Schematic Layout
 Double Click on your schematic document
from the left navigator menu, and you should
see a blank screen on the right
Schematic Layout- Placing Parts
 From the ‘Place’
menu, click Part.
Schematic Layout- Placing Parts
 The ‘Place Part’
screen will appear.
Click the box in the
top right with the […].
This will bring up the
‘Browse Libraries’,
which is just a list of a
few default libraries
and all the libraries
we have added to the
project.
Schematic Layout- Placing Parts
 From the ‘Libraries’
drop down box, look
for the Microchip
Microcontroller library

we added earlier.
Schematic Layout- Placing Parts
 Choosing the PIC18F452 for our project we
see there are three choices in the list. Which
one do we choose? Why is there three
options for one part?
 This is where the footprint comes in. Although
the PIC18F452 has the same electrical and
logic properties, the physical packaging
comes in three different forms.
 PLCC- 44 Pins
 QFN- 44 Pins
 DIP- 40 Pins
Schematic Layout- Placing Parts
 Don’t worry if you don’t know what terms like
PLCC, QFN, TQFP, DIP mean at the
moment. You can look at the Protel layout
and it will show you what the footprint
differences are.
Schematic Layout- Placing Parts
 PIC18F452-E/L : This is a PLCC-44 package. In the
bottom left corner you can see the description of the
package including dimensions.