MCP3909-I/SS Microchip Technology, MCP3909-I/SS Datasheet - Page 3

• Manufacturer Part Number: MCP3909-I/SS
• Description: IC POWER METERING-1 PHASE 24SSOP
• Manufacturer: Microchip Technology

Specifications of MCP3909-I/SS

• Package / Case: 24-SSOP (0.200", 5.30mm Width)
• Input Impedance: 390 KOhm
• Measurement Error: 0.1%
• Voltage - I/o High: 2.4V
• Voltage - I/o Low: 0.85V
• Current - Supply: 2.3mA
• Voltage - Supply: 4.5 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Meter Type: Single Phase
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Voltage Range: 4.5V To 5.5V
• Digital Ic Case Style: SSOP
• No. Of Pins: 24
• Interface Type: Serial, SPI
• Supply Voltage Max: 5.5V
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: MCP3909EV-MCU16 - EVALUATION BOARD FOR MCP3909MCP3909RD-3PH1 - REF DESIGN MCP3909 3PH ENGY MTR
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Preface ........................................................................................................................... 7
Chapter 1. Meter Overview
Chapter 2. Hardware Description
Chapter 3. Firmware
Chapter 4. Meter Calibration
© 2009 Microchip Technology Inc.
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
1.1 Introduction ................................................................................................... 11
1.2 Meter Design Parameters ............................................................................ 11
1.3 Power Calculations ....................................................................................... 12
1.4 Getting Started ............................................................................................. 13
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
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
4.1 Introduction ................................................................................................... 39
4.2 Current/voltage Calibration .......................................................................... 39
4.3 Apparent Power Calibration ......................................................................... 40
4.4 Phase Lag Calibration ................................................................................. 41
ENERGY METER REFERENCE DESIGN
Table of Contents
MCP3909 / dsPIC33F 3-PHASE
DS51723A-page 3