Microchip Technology DM164123 Scheda Tecnica

Microchip Technology

PICDEM™ SYSTEM MANAGEMENT

USER’S GUIDE

©

2007 Microchip Technology Inc.

DS41304B-page iii

Table of Contents

Preface ........................................................................................................................... 1

Chapter 1. PICDEM™ System Management

1.1 Introduction ..................................................................................................... 7
1.2 Highlights ........................................................................................................ 7
1.3 PICDEM™ System Management Kit Contents .............................................. 7
1.4 PICDEM System Management Layout ........................................................... 8

1.4.1 Board Features ............................................................................................ 8
1.4.2 Board Connections  ...................................................................................... 8
1.4.3 Heating Element  ........................................................................................ 10
1.4.4 Board Options  ........................................................................................... 10

1.5 Quick Start Guide ......................................................................................... 10

1.5.1 Demonstration Program  ............................................................................ 10
1.5.2 Real-Time Clock: Address 0xA2 ................................................................ 11
1.5.3 Analog-to-Digital Converter (ADC): Address 0xA4 .................................... 11
1.5.4 Serial EEPROM: Address 0xA8  ................................................................ 12
1.5.5 Thermal Management: Address 0xA6  ....................................................... 12
1.5.6 General I

C™ ............................................................................................ 13

Chapter 2. Background

2.1 Introduction ................................................................................................... 15
2.2 Highlights ...................................................................................................... 15
2.3 PICDEM™ System Management and PICkit™ Serial Analyzer .................. 15
2.4 Fan Speed Control ....................................................................................... 15

2.4.1 Two-wire Fan ............................................................................................. 15
2.4.2 Three-wire Fan  .......................................................................................... 16
2.4.3 Measuring the Speed of a Two and Three-wire Fan  ................................. 16
2.4.4 Four-wire Fan Control  ............................................................................... 17

Chapter 3. Troubleshooting

3.1 Introduction ................................................................................................... 19
3.2 Common Problems ....................................................................................... 19

3.2.1 Serial Communications does not appear to be working ............................ 19
3.2.2 Microcontroller does not run after programming using the

ICD 2 ...................................................................................... 19

3.2.3 The fan is not providing proper feedback .................................................. 19
3.2.4 Heating element is not heating .................................................................. 19
3.2.5 Temperature is not changing ..................................................................... 19