1 Printed Circuit Board Daniel Miller Joe Quesada Justine Lazo http://saturnpcb.com/pcb_services.htm 2 Overview • What is a PCB? • Why use a PCB? • How do I make a PCB? 3 Printed Circuit Board Circuit connects components through board Made of alternating layers of conducting and insulating materials http://www.seilpcb.co.kr/products/images/2_1_img5.gif 4 Why PCB? • Features • Surprisingly Affordable • Highly reliable • Compact • Drawbacks • Requires more layout than other board types • Higher initial cost than wire wrap or point-topoint construction http://en.wikipedia.org/wiki/File:Breadboard_complex.jpg 5 PCB Design Steps 1 2 3 4 Design the circuit Place the components Route the wires Manufacture 6 EDA Software • PCB design software package • Design the circuit (Schematics editor) • Place the components (PCB editor) • Route the wires (Autorouter module) • Examples: • EAGLE • ExpressPCB 7 Schematic Capture Pin in/outs Components Interconnections Easily Readable High-Level Block Diagram All pictures of schematics and EAGLE screenshots from http://www.sparkfun.com/tutorials/108 and http://www.sparkfun.com/tutorials/109 8 Placement of Components • Rat’s Nest 9 Placement of Components • Place big components first- e.g. microcontroller • Place components in separate functional groups • Put a ground plane under all components 10 Signal Routing Component Placement • Surface mount • Top and bottom planes • Minimal routing area • Through-hole mounted • All components on same side • Reduces routing area on all planes http://www.ehow.com/how_8306661_solder-mini-components.html http://blog.amal.net/?p=188 11 Signal Routing • Traces are wires connecting components • Traces can be routed through multiple layers 12 Vias and Pads • Vias are connections between layers • Pads are copper areas for pin connections 13 Manufacturing Files • Gerber Files • Industry standard file format to describe circuits • Generated by PCB design software • Contains all necessary info to manufacture a circuit board (Traces, Pads, Silkscreen, etc.) • Drill Files • Describes the location and size of holes • Zipped with Gerber files and sent to manufacturer 14 Viewplot Check 15 Cost Estimate •www.pcbfabexpress.com 16 Cost Estimate •www.sunstone.com 17 Summary • PCBs allow for portable and reliable circuits • Designed in EDA Software ▫ ▫ ▫ ▫ Design the circuit Place the components Route the wires Manufacture • Price varies based on size and urgency 18 References • • • • • • http://saturnpcb.com/pcb_services.htm http://www.seilpcb.co.kr/products/images/2_1_img5.gif http://en.wikipedia.org/wiki/File:Breadboard_complex.jpg http://www.sparkfun.com/tutorials/108 http://www.sparkfun.com/tutorials/109 http://www.ehow.com/how_8306661_solder-minicomponents.html • http://blog.amal.net/?p=188 • http://www.pcbfabexpress.com/preview_specs.jsp • http://www.sunstone.com/products-services/quickturnproto-boards/pricing.aspx 19 Questions?