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DSPIC33FJ64GP802-E/SP 产品设计参考手册 - Microchip（微芯）
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Microchip（微芯）
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微控制器
封装:
DIP-28
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数字信号处理器和控制器 - DSP, DSC 16B DSC 28LD64KB DMA 40MIPS
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DSPIC33FJ64GP802-E/SP数据手册
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若手册格式错乱，请下载阅览PDF原文件
MCP3909 / dsPIC33F 3-PHASE
ENERGY METER REFERENCE DESIGN
© 2009 Microchip Technology Inc. DS51723A-page 3
Table of Contents
Preface ...........................................................................................................................7
Introduction............................................................................................................ 7
Document Layout..................................................................................................8
Conventions Used in this Guide............................................................................ 9
Recommended Reading...................................................................................... 10
The Microchip Web Site......................................................................................10
Customer Support...............................................................................................10
Document Revision History.................................................................................10
Chapter 1. Meter Overview
1.1 Introduction ................................................................................................... 11
1.2 Meter Design Parameters ............................................................................11
1.3 Power Calculations .......................................................................................12
1.4 Getting Started ............................................................................................. 13
Chapter 2. Hardware Description
2.1 Overview ......................................................................................................17
2.2 Analog Front End Circuitry ...........................................................................18
2.3 Analog-To-Digital Conversion ...................................................................... 20
2.4 dspic33f Hardware Connection And Peripheral Usage ................................22
2.5 Power Supply ............................................................................................... 25
Chapter 3. Firmware
3.1 Overview ......................................................................................................27
3.2 Main Loop ..................................................................................................... 27
3.3 Calculation() - Calculating Electrical Parameters ......................................... 29
3.4 ADC Sampling Scheme For Calculations .................................................... 33
3.5 ReadING A/D Data Of The MCP3909 Device ..............................................35
3.6 Communication Of UART Interface .............................................................. 37
3.7 Resource Configuration ................................................................................37
3.8 Description Of Project Files .......................................................................... 38
Chapter 4. Meter Calibration
4.1 Introduction ................................................................................................... 39
4.2 Current/voltage Calibration ..........................................................................39
4.3 Apparent Power Calibration .........................................................................40
4.4 Phase Lag Calibration ................................................................................. 41
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