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Microprocessor PCB Design

Microprocessor PCB Design. by: Tuan Hung Huynh April 3, 2006. Outline. Background Design Process Application Results. Purpose. Designing computer circuits and software for the Microprocessor class. PCB layout software Documentation. Background. Past Designs. People to mention

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Microprocessor PCB Design

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  1. Microprocessor PCB Design by: Tuan Hung Huynh April 3, 2006

  2. Outline • Background • Design Process • Application • Results

  3. Purpose • Designing computer circuits and software for the Microprocessor class. • PCB layout software • Documentation

  4. Background

  5. Past Designs • People to mention • Wi Sugiri (projects) • Dan Sossaman (board) • Neil Clukode • Matt Olson • Tuan Huynh • Chris Carpenter

  6. Microcontroller • Microcontroller or Microprocessor? • Microcontroller – basic • Microprocessor - complex • Atmel and Intel 8051 core architecture • AT89S8252 (8052) • AT89S8253 (8053)

  7. Design Process

  8. Structure • Developing the schematic layout • Updating and improvements • Ordering of components • Developing software • Transforming into a workable circuit • Testing and demonstration • Optional manufacture of the PCB

  9. Protel • Schematic Layout

  10. Protel • Schematic and PCB Libraries • Custom components • Link of files PCB library Schematic library

  11. Protel • PCB Layout • Physical representation

  12. Protel • Design Rule Check (DRC) • Short Circuits • Broken Nets • Height and Width Constraints • Hole Size • Clearance Constraints

  13. Protel • Assembly Files • Gerber Files • NC Drill Files

  14. Assembly Files • Top Silkscreen

  15. Assembly Files • Top and Bottom Copper

  16. Assembly Files • Top Soldermask and Bottom Soldermask

  17. Assembly Files • Drill File

  18. Creation of the PCB • Board Manufacture • Advanced Circuits • www.4PCB.com • www.FreeDFM.com • Component Vendors • Digikey • All Electronics

  19. Application

  20. Microprocessor Projects • Microprocessor Design class: • Digital Metronome • T-Bird Taillights • Digital Clock • Serial Communication • Memory Mapped Input/Output • 7-Segment Displays • Keypad Input • LCD Display

  21. SEC MIN Microprocessor Projects • Digital Metronome • T-Bird Taillights • Digital Clock • Port 3

  22. Microprocessor Projects • Serial Communications • Hyper-terminal • RS232 buffer chip • Serial cable

  23. Microprocessor Projects • Serial Communications Cable • DB9 to RJ45

  24. Microprocessor Projects • Memory Mapped Input/Output • Data latch

  25. Microprocessor Projects • 7-Segement Displays • Data latch • Programmable logic device • FETs

  26. Microprocessor Projects • Keypad • Data latch • PLD

  27. Microprocessor Projects • Liquid Crystal Display • Data latch • PLD

  28. Problems Encountered • Issues with new microcontrollers • Chip burners • Capacitance • Internal Fuse Bits • In-System-Programming Circuit

  29. Pin 20 Pin 8 RJ45 Jack Programmable Logic Device Pin 8 Pin 19 In-System-Programming • Modification of the board is possible • Buffer chip • Programmable logic device • Re-wire

  30. In-System-Programming • ISP Cable • DB25 to RJ45

  31. Results

  32. Completion • Board applied in the classroom • Update from previous designs • Capable of future updates

  33. Future Design • Reduction of Components • Dual Microcontrollers • USB • Surface Mount Components

  34. Questions

  35. References • Marcus O. Durham, PhD. Systems Design and the 8051. Second Edition. TechnoPress. Tulsa, OK. 2003 – 2004. • Altium – Protel • http://www.4pcb.com • http://www.allelectronics.com • http://www.play-hookey.com/digital/experiments /seven_seg_led.html

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