Transcript Session Title

Introduction to Prototyping a
LED Driver
Part II: Using PCB Layout Software –
Schematic Capture and Component
Libraries
September 24-28, 2012
Carol Lenk
Schematic Capture
• Using DesignSpark, freeware, good feature
set, no limitations.
• New schematic.
• Add components.
• Add connection wires.
Add Component
• Select resistor.cml library.
• 0.1W resistor is SM0805 package.
Will use 0.063W with SM0603
package and change the name.
• Only 150K available. Will change
value.
• Need to copy component to our
custom library and make changes
there.
Custom Libraries
• Create custom library to store commonly used
components and to modify components.
• Add path of New Library to Files tab.
Custom Libraries
• Create New Library for Component: 9910Demo.cml
Copy Component
• On Component Tab, find resistor.cml, find “r 0.063w SMTF”,
click Copy To…, navigate to our library, rename “R”.
• We’ll add the resistance for each instance of R on the
schematic, so we can display it on the schematic.
Add Component
Properties
• Double click on component to get to
Properties.
– Double click on the text to get “text” tab to
control what is displayed.
Values
• Properties: Values Tab
• Double click on Value to change it.
• Click on Add.. To add Digikey field with part
number.
Add Capacitor
Copy capacitor to our library
• Go to Library Manager.
• Select capacitor.cml library.
• Select 1206 package.
• Copy component to our
9910Demo.cml library.
• Rename component as C.
Add C to our schematic
• Go to Add Component.
• From our library, select C.
Add Values to C
• Double click on component to go to
Properties.
• Go to Values tab.
– Double click on Mfr, delete AVX.
– Click on Add, type “Value” for Name and
“10 uF, 35V” for Value.
– Click on Add, type “Digikey” for Name and
“490-5520-1-ND” for Value.
– Check box for value to display
capacitance.
• Double click on component label to
adjust display.
– In Text tab, uncheck “Component Name.”
Connect Components
• Double click on x on R1, double click on x on C1.
• Hover cursor over wire to see the name of the
connection net.
• Right click on wire to change net name.
Translate to PCB
• In Tool Menu, select Translate to PCB.
• New PCB Wizard – use default settings.
– Units, 2 Layer Board, board size, etc.
• 9910Demo.pcb
– Footprints
– Yellow is Silkscreen
– Green is board
outline
– Airwires show pads
that should be
connected.
Lay Down Copper
• Move components to within board outline.
• Double click on pad to start wire, double click
on destination pad to finish wire.
Thank You