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 Schematic library PCB 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.GTLTop Layer.GBLBottom Layer.GTOTop Overlay.GBOBottom Overlay.GTSTop Soldermask.GBSBottom Soldermask.GKOKeep-out Layer.apr Drill Files.drr.drl

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. Microprocessor Projects Digital Metronome T-Bird Taillights Digital Clock – Port 3 SECMIN

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

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