Microchip Technology MCP3905A, MCP3906A Reference Design

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MCP3905A/06A

Energy Meter

Reference Design

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MCUs and dsPIC® DSCs, KEELOQ

code hopping

MCP3905A/06A ENERGY METER

REFERENCE DESIGN

Table of Contents

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

Chapter 1. Product Overview

1.1 Introduction .....................................................................................................5

1.2 What is the MCP3905A/06A Energy Meter Reference Design? ....................5

1.3 What the MCP3905A/06A Energy Meter Reference Design Kit Includes ......5

Chapter 2. Installation and Operation

2.1 Introduction .....................................................................................................7

2.2 Features .........................................................................................................7

2.3 Getting Started ...............................................................................................8

2.4 Energy Meter Reference Design Overview ....................................................9

2.5 Front-Side Of PCB Detailed Description ...................................................... 10

2.6 Back Side Of PCB Detailed Description .......................................................11

Appendix A. Schematics and Layouts

A.1 Introduction ..................................................................................................13

A.2 Schematics and PCB Layout ....................................................................... 13

A.3 Board Schematic ........................................................................................14

A.4 Board Layout – Top Layer ..........................................................................15

A.5 Board Layout – Bottom Layer ................................................................... 15

Appendix B. Bill Of Materials (BOM)

Worldwide Sales and Service ....................................................................................20

MCP3905A/06A Energy Meter Reference Design

NOTES:

MCP3905A/06A ENERGY METER

REFERENCE DESIGN

Preface

NOTICE TO CUSTOMERS

All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available.

Documents are identified with a “DS” number. This number is located on the bottom of each page, in front of the page number. The numbering convention for the DS number is “DSXXXXXA”, where “XXXXX” is the document number and “A” is the revision level of the document.

For the most up-to-date information on development tools, see the MPLAB Select the Help menu, and then Topics to open a list of available on-line help files.

IDE on-line help.

INTRODUCTION

This chapter contains general information that will be useful to know before using the MCP3905A/06A Energy Meter Reference Design. Items discussed in this chapter include:

• Document Layout

• Conventions Used in this Guide

• Recommended Reading

• The Microchip Web Site

• Customer Support

• Document Revision History

DOCUMENT LAYOUT

This document describes how to use the MCP3905A/06A Energy Meter Reference Design as a development tool to emulate and de b ug firm wa re on a target boar d. The manual layout is as follows:

• Chapter 1. “Product Overview” – Important information about the MCP3905A/06A Energy Meter Refere nc e Des i gn .

• Chapter 2. “Installation and Operation” – Provides a detailed description of each block, as well as instructions on how to get started with this board.

• Appendix A. “Schematics and Layouts” – Shows the schematic and board layout diagrams for the MCP3905A/06A Energy Meter Reference Design.

• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the MCP3905A/06A Energy Meter Refere nc e Des i gn .

MCP3905A/06A Energy Meter Reference Design

CONVENTIONS USED IN THIS GUIDE

This manual uses the following documentation conventions:

DOCUMENTATION CONVENTIONS

Description Represents Examples

Arial font:

Italic characters Referenced books MPLAB® IDE User’s Guide

Emphasized text ...is the only compiler...

Initial caps A window the Output window

A dialog the Settings dialog A menu selection select Enable Programmer

Quotes A field name in a window or

dialog

Underlined, italic text with right angle bracket

Bold characters A dialog button Click OK

N‘Rnnnn A number in verilog format,

Text in angle brackets < > A key on the keyboard Press <Enter>, <F1>

Courier New font:

Plain Courier New Sample source code #define START

Italic Courier New A variable argument file.o, where file can be

Square brackets [ ] Optional arguments mcc18 [options] file

Curly brackets and pipe character: { | }

Ellipses... Replaces repeated text var_name [,

A menu path File>Save

A tab Click the Power tab

where N is the total number of digits, R is the radix and n is a digit.

Filenames autoexec.bat File paths c:\mcc18\h Keywords _asm, _endasm, static Command-line options -Opa+, -Opa- Bit values 0, 1 Constants 0xFF, ‘A’

Choice of mutually exclusive arguments; an OR selection

Represents code supplied by user

“Save project before build”

4‘b0010, 2‘hF1

any valid filename

[options] errorlevel {0|1}

var_name...] void main (void)

{ ... }

Chapter 1. Product Overview

1.1 INTRODUCTION

This chapter provides an overview of the MCP3905A/06A Energy Meter Reference Design and covers the following topics:

• What is the MCP3905A/06A Energy Meter Reference Design?

• What the MCP3905A/06A Energy Meter Reference Design Kit includes

1.2 WHAT IS THE MCP3905A/06A ENERGY METER REFERENCE DESIGN

The MCP3905A/06A Energy Meter Reference Design device is an energy metering IC that supplies average active power information via a pulse output with direct drive for mechanical counters. It also includes a higher-frequency output that supplies instantanous power information for calibration. The device contains function blocks specific for IEC energy meter compliance, such as a no-load threshhold and startup current.

The MCP3905A/06A Energy Meter Reference Design Printed Circuit Board (PCB) is used as a reference design for single-phase, residential meter s. T he M CP3905 A/0 6A Energy Meter Reference Design kit includes all necessary PCB circuits and layout tips for IEC62053 and prior 1036/61036/687 active-energy meter standards compliance. For more information regarding IEC compliance, refer to AN994, “IEC Compliant Active Energy Meter Design Using The MCP3905A/06A Energy Meter Reference Design” (DS00994).

1.3 WHAT THE MCP3905A/06A ENERGY METER REFERENCE DESIGN KIT INCLUDES:

This MCP3905A/06A Energy Meter Reference Design kit includes:

• MCP3905A/06A Energy Meter Reference Design, 102-00037

• Important Information Sheet

MCP3905A/06A Energy Meter Reference Design

NOTES:

Chapter 2. Installation and Operation

8 9 0 1

4 5 6 7

8 9 0 1

2 3 4 5

current-sensing

element

current-sensing

element

CLASS 1 METER 5(40)a

POWER = 1432 KW ENERGY = 43213 kWh 28/03/2004 15:23:23

Analog

Digital

PICmicro

REFERENCE DESIGN

MCP3905A Stand-Alone Mechanical Counter

Energy Meter

Microcontroller-based LCD Energy Meter

1000 imp/kWh CLASS 1 METER 5(40)a

MCU

MCP3905A/06A

2.1 INTRODUCTION

The MCP3905A/06A Energy Meter Reference Design is a stand-alone, single-phase residential meter design for active-energy meter designs. For advanced microcontroller-based meter products, this design also serves as the de sign of the Analog Front-End (AFE). This design includes a low-cost DC power supply circuit and the necessary protection for IEC62053 EMC compliance.

MCP3905A/06A ENERGY METER

REFERENCE DESIGN

2.2 FEATURES

FIGURE 2-1: MCP3905A Stand-Alone Energy Meter and Microcontroller-Based Energy Meter Using MCP3905A AFE Design.

For more detailed information regarding design decisions and an approach to IEC62053 compliance using the circuitry in this board, refer to AN994 “IEC Compliant Active Energy Meter Design Using The MCP3905A/06A” (DS00994).

The MCP3905A/06A Energy Meter Reference Design PCB has the following features:

• Protection for IEC62053 Energy Meter EMC Immunity Tests

• On-Board DC power supply

• Resistor divider circuit for single-point meter calibration

• Connections for current-sensing shunt or other current sensing element

• Connection for voltage-sensing and power supply biasing

• Connections for mechanical counter and calibration output

• Low-noise PCB layout for small-signal conversion and IEC62053 accuracy compliance for small shunt values

• Low-cost design

MCP3905A/06A Energy Meter Reference Design

2.3 GETTING STARTED

This meter can be manufactured by performing the following two steps detailed in this document. For the external connections, the following terms are used: “phase” refers to the hot (or line) side of the power supply lines. “Neutral” refers to the return wire (or low-side) of the power supply lines.

2.3.1 External Connections

Connections are made to the phase and neutral wire for voltag e-detection and AC/DC power supply . The MCP3905A/06A Energy Me ter Reference De sign is designed to be biased to the phase (or hot) side of a 2-wire power supply system.

1. Connect JP4 to the phase power supply line connection.

2. Connect JP3 to the neutral line.

3. Connect JP1 and JP2 across the shunt.

4. Connect JP5 and JP6 to the mechanical counter.

2.3.2 Calibration of the Frequency Output using the Voltage Divider Calibration Circuit

Each meter must be calibrated using the voltag e divider circuit going into Channel 1 of the MCP3905A/06A. A known power is supplied to the meter (e.g., 1000W), and an expected output frequency is the goal (1000 imp/kWh). Start with the highest value resistor and short the resistor using it's respective shorting jumper. If the output frequency is too high, remove the shunt. Continue testing each resistor short until all jumpers are tested once. For more det ailed information regarding meter calibra tion and the PCB design approach using the circuitry in this docume nt , ref er to AN99 4, “IEC Compliant Active Energy Meter Design Using The MCP3905A/06A” (DS00994).

FIGURE 2-2: Photograph of Complete, Stand-Alone MCP3905A Energy Meter.

Installation and Operation

2.4 ENERGY METER REFERENCE DESIGN OVERVIEW

This reference design can be used as eit her a stand-a lone mechanical cou nter energy meter, or as the analog front-end design in advanced microcontroller-base d meter designs.

The AFE design limits the overall meter accuracy. A low noise, proven AFE circuit and layout is still required for a high-accuracy meter. For both meter types, the current sense input, voltage sense input, calibration scheme, jumper selection and power supply design blocks described here should apply.

This reference design keeps all of the major compo nents on the back-side of the PCB. This minimizes any ill effects from the environment in the situation that a meter case experiences failure. Only the necessary components for calibration, jumper selection and external connections are placed on the fro nt-side of the board. Keeping the lar ger DC power supply components on the back-side of the board is also necessary for installation in some meter cases with PCB standoffs.

The major components on the front-side of the MCP3905A/06A Energy Meter Reference Design are listed here and described in Section 2.5 “Front-Side Of PCB Detailed Description”.

1. Shunts for Gain, FC and HPF selection (J11-J15).

2. Calibration jumpers (J1-J10).

3. Output connections for mechanical counter and calibration (JP5-JP7).

4. Input connection from the current-sensing element (JP1,JP2).

5. Input connection from voltage or phase line and ground reference point (JP3,JP4).

6. The analog ground plane, power supply ground plane, moat.

The major components on the back-side of the MCP3905A/06A Energy Meter Reference Design are listed here and described in Section 2.6 “Back Side Of PCB Detailed Description”.

1. MCP3905A (U1).

2. DC Power Supply (C17, C16, U2, C18, etc.).

3. Metal Oxide Varistor (MOV1).

4. Optical isolator for PIC

These blocks, and their functionality, will be briefly described in the following two sections. For more detailed information re garding design decisions and appr oaches to IEC1036 compliance, refer to AN994, “IEC Compliant Active Energy Meter Design Using The MCP3905A/06A” (DS00994). For a more detailed circui t schematic, refer to

Appendix A. “Schematics and Layouts” and Appendix B. “Bill Of Materials (BOM)”.

Microcontroller Unit (MCU) or calibration (U3).

MCP3905A/06A Energy Meter Reference Design

FRONT

Power Supply

Ground Plane

Analog

Ground Plane

BACK

DC Power

Supply

(U1)

Opto. Isolator (U3)

MOV1

Power Supply

Ground Plane

Analog

Ground Plane

Voltage Conn.

(JP3,JP4)

Current Conn.

(JP1,JP2)

Calibration

Jumpers (J1-J10)

Shunts for Gain,

FC and HPF

Selection (J11-J15)

Output Connections (JP5-JP7)

MCP3905A

FIGURE 2-3: MCP3905A/06A Energy Meter Reference Des i gn Block Dia gr am .

2.5 FRONT-SIDE OF PCB DETAILED DESCRIPTION

2.5.1 Shunts for Gain and FC Selection (J11-J15)

Positions for both logic-high and logic-low are here for all gain and frequen cy const ant selections. The logic-high positions are labeled “J1H” and the logic-low positions are labeled “J1L” (Jumper 1 used here as an example). Do n ot short both the high and the low positions for any one jumper.

2.5.2 Calibration Jumpers (J1-J10)

Calibration resistors for each of these jumper locations are located directly beneath the associated jumper. When a shorting resistor or jumper is in place, the associated calibration resistor is shorted and bypassed.

2.5.3 Output Connections for Mechanical Counter and Calibration

JP5 and JP6 are the differential output drive for the mechan ica l c ounter.

(JP5-JP7)

JP7 is the calibration or microcontroller output that is connected to HF MCP3905A/06A devices. A LED is supplied to assist in any optical calibration schemes.

2.5.4 Connection to Current-Sensing Element (JP1,JP2)

These two connections lead directly through LRC filtering into Channel 0 of the MCP3905A/06A. The schematic in Appendix A uses a low-cost shunt as the current-sensing element. The shunt resistance should be placed in parallel with these two connections, between JP1 and JP2.

OUT

on the

Installation and Operation

2.5.5 Connection to Voltage or Phase Line and Ground Reference

Point (JP3,JP4)

These two connections feed the DC power supply circuitry described in Section 2.6.3 “Metal Oxide Varistor (MOV1)”. JP4 is connected to the ground of the PCB, and JP3 to the high-side of the DC power supply circuitry. JP3 is also connected to the resistor divider that feeds the analog input of Cha nnel 1 o f the MCP39 05A/06A. This is the channel for measuring voltage and is conne cted to the dif ferential input in a single-ended fashion. See Appendix A. “Schematics and Layouts” for further det ail.

2.6 BACK SIDE OF PCB DETAILED DESCRIPTION

2.6.1 MCP3905A (U1)

From the back side of the board, the MCP3905A/06A is located on the right ha nd side where the analog ground plane exists. The MCP390 5 A/0 6A ha s ap pr o pr iate bypass capacitors on V its input logic pins connected to user-sel ectable jumpers, with the exception of the HPF pin. For this system, the HPF is turned on with this pin connected to V in AC mode only. The NEG connection is not connected in this reference design; this pin should be left floating. The other three output pins (F connected to nodes JP5, JP6 and JP7 described later in this section.

coming from the DC power supply circuitry . The MCP3905A/06A has

OUT0

, F

OUT1

; the device is

, HF

OUT

) are

2.6.2 DC Power Supply (C17, C16, U2, C18, D2)

The DC power supply is created from a half-wave zener diode limited AC sig nal feeding a 7805 +5V regulator . C1 7 and C16 divide the AC sig nal coming directly from the line and designed in this document for 220V. The zener diode D2 limits the peak voltage to 15V.

2.6.3 Metal Oxide Varistor (MOV1)

A MOV is included to suppress any high voltage transients co ming thro ug h the power lines.

2.6.4 Optical Isolator (U3)

An optical isolator is included in the reference design as an additional level of protection for other circuitry used in advanced meter designs (PICmicro otherwise). It is connected to the HF Depending on the meter design, it may not be required. This design is a direct-connect meter that has the entire PCB referenced to the phase or line -side of the power supply. Therefore, any other circuitry would either need to be biased to the same point or isolated using this scheme. A pull-up resistor is required on the output of the optical isolator to allow the HF logic signal to appear.

frequency output of the MCP3905A.

OUT

microcontroller, DSP or

2.6.5 The Analog Ground Plane, Power Supply Ground Plane, Moat.

The MCP3905A/06A Energy Meter Reference Design PCB is designed for low-noise performance and immunity to external influences, as required by IEC61036. The DC power supply and digital outputs are connected to the power supply ground plane (right-side of the board when looking at it from the front). The lower noise analog ground plane, including the MCP3905A/06A connections, is on the o pposite side of the board, separated by a moat between the two ground planes. An inductive choke connects the two grounds.

MCP3905A/06A Energy Meter Reference Design

NOTES:

MCP3905A/06A ENERGY METER

Top Layer

Bottom Layer

Appendix A. Schematics and Layouts

A.1 INTRODUCTION

This appendix contains the following schematics and layouts for the MCP3905A/06A Energy Meter Reference Design:

• Board Schematic

• Board – Top Layer

• Board – Bottom Layer

A.2 SCHEMATICS AND PCB LAYOUT

The layer order is shown in Figure A-1.

FIGURE A-1: LAYER ORDER

REFERENCE DESIGN

MCP3905A/06A Energy Meter Reference Design

1 2 3 4 56

54321

Title

Number RevisionSize

Date: 17-Jun-2005 Sheet of

File: C:\Active Board Files\102-00031 thru 102-00040\102-00037\PCB Files\Protel Files\0003

Drawn By:

C13

10uF/6.3V

C11

220uF/6.3V

C12

0.1uF

0.033uF

C17

0.47uF

C16

0.01uF

0.1uF

C15

0.1uF

C14

0.1uF

C9 22pF

C8 22pF

0.1uF

C18

470uF/35V

10uF/6.3V

1N4744A

1N4004

VOUT

VIN

7805

110 Ohms at 100MHz

300ma/150ohmsZ4300ma/150ohms

R22 10 Ohms

R20

20 Ohms

R19

20 Ohms

R16

330K

R15

330K

C10

0.1uF

VDD

JP1

JP2

R21

470 Ohms

MOV1

140-J

JP4

JP3

VDD

CAL-LOWCAL-HIGH

R23

J12L

0 Ohms

J11L

0 Ohms

J12H

0 Ohms

J11H

0 Ohms

J13L

0 Ohms

J14L

0 Ohms

J14H 0 Ohms

J13H 0 Ohms

J15L

0 Ohms

J15H 0 Ohms

R17

3.579545MHZ

R18

820 Ohms

+ -

RED LED

PS2501

VDD

JP7

JP8

JP5

JP6

0 Ohms

300K

150K

75K

0 OhmsR839K

0 OhmsR918K

0 Ohms

R10

9.1K

0 Ohms

R11

5.1K

0 Ohms

R12

2.2K

0 Ohms

R13

1.2K

J10

0 Ohms

R14

560 Ohms

CAL-HIGH

CAL-LOW

CALIBRATION NETWORK

To Calibration Network

110 Ohms at 100MHz

MCP3905 Energy Meter Reference Design

103-00037

DVDD1HPF2AVDD3NC14CH0+5CH0-6CH1-7CH1+8MCLR9REFIN/OUT10AGND11F2

F113F0

G115G0

OSC217OSC1

NC2

NEG

DGND

HFOUT

FOUT123FOUT0

MCP3905-SSOP24

REV

REV History Date

Initial Release

10/21/05

A.3 BOARD SCHEMATIC

A.4 BOARD LAYOUT – TOP LAYER

A.5 BOARD LAYOUT – BOTTOM LAYER

Schematics and Layouts

MCP3905A/06A Energy Meter Reference Design

NOTES:

MCP3905A/06A ENERGY METER

REFERENCE DESIGN

Appendix B. Bill Of Materials (BOM)

TABLE B-1: BILL OF MATERIALS (BOM)

Qty Reference Description Manufacturer Part Number

4 C1, C2, C3, C4 CAP 33000PF 50V CERM X7R 0805 Panasonic® - ECG ECJ-2VB1H333K 2 C5, C13 CAPACITOR TANT 10UF 6.3V 20%

SMD

6 C6, C7, C10,

C12, C14,C15 2 C8, C9 CAP 22PF 50V CERAMIC 0402 SMD Panasonic - ECG ECJ-0EC1H220J 1 C11 CAP 220UF 10V ELECT FC RADIAL Panasonic - ECG EEU-FC1A221S 1 C16 01UF INTERFERFENCE METAL CAP Panasonic - ECG ECQ-U2A103MN 1 C17 47UF/630VDC METAL POLY CAP Panasonic - ECG ECQ-E6474KF 1 C18 CAP 470UF 35V ELECT FC RADIAL Panasonic - ECG EEU-FC1V471 1 D1 LED GREEN DIFFUSED ROUND

1 D2 RECTIFIER GPP 400V 1A DO-41 Diodes Inc. 1N4004-T 1 D3 DIODE ZENER 15V 1W 5% DO-41 Diodes Inc. 1N4744A-T

10 J1-J10 RES .1 OHM 1/4W 5% 1210 SMD Panasonic - ECG ERJ-14RSJR10U

5 J11H, J12H,

J13H, J14H,

J15H 5 J11L, J12L,

J13L, J14L,

J15L 8 JP1--JP8 PIN RECPT .032/.046 DIA 0328 SER Mill-Max

1 MOV1 Suppressors;Clamping Voltage

1 PCB RoHS Compliant Bare PCB,

5 R1-R4, R23 RES 1.00K OHM 1/8W 1% 1206 SMD Panasonic - ECG ERJ-8ENF1001V 1 R5 RES 300K OHM 1/2W 5% 2010 SMD Panasonic - ECG ERJ-12ZYJ304U 1 R6 RES 150K OHM 1/4W 5% 1210 SMD Panasonic - ECG ERJ-14YJ154U 1 R7 RES 75K OHM 1/4W 5% 1206 SMD Panasonic - ECG ERJ-8GEYJ753V 1 R8 RES 39K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ393X 1 R9 RES 18K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ183X 1 R10 RES 9.1K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ912X 1 R11 RES 5.1K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ512X 1 R12 RES 2.2K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ222X 1 R13 RES 1.2K OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ122X

Note 1: The components listed in this Bill of Materials are rep resent ative of the PCB assembl y. The released BOM

used in manufacturing uses all RoHS-compliant components.

CAP .1UF 16V CERAMIC X7R 0805 Panasonic - ECG ECJ-2VB1C104K

LONG

RES 0.0 OHM 1/8W 5% 0805 SMD Panasonic - ECG ERJ-6GEY0R00V

Do Not Populate — —

Maximum:710V

MCP3905A/06A Energy Meter Reference Design

Kemet Corp.

Panasonic - SSG LN31GPH

Manufacturing Corp. EPCOS SIOV-S20K275

— 104-00037

Electronics

T491A106M006AS

0328-0-15-15-34-27-10-0

MCP3905A/06A Energy Meter Reference Design

TABLE B-1: BILL OF MATERIALS (BOM) (CONTINUED)

Qty Reference Description Manufacturer Part Number

1 R14 RES 560 OHM 1/16W 5% 0402 SMD Panasonic - ECG ERJ-2GEJ561X 2 R15, R16 RES 330K OHM 1/2W 5% 2010 SMD Panasonic - ECG ERJ-12ZYJ334U 1 R18 RES 820 OHM 1/4W 5% 1206 SMD Panasonic - ECG ERJ-8GEYJ821V 2 R19, R20 RES 20 OHM 1/4W 5% 1206 SMD Panasonic - ECG ERJ-8GEYJ200V 1 R21 RES 470 OHM 1W 5% METAL OXIDE Panasonic - ECG ERG-1SJ471 1 R22 RES 10 OHM 1/4W 5% 1206 SMD Panasonic - ECG ERJ-8GEYJ100V 1 U1 Energy Metering Device Microchip Technology

Inc.

1 U2 IC VOLT REG 5V 100MA 8-SOIC National

Semiconductor

1 U3 1 CHANNEL OPTO COUPLER

TRANS DIP

1 Y1 CRYSTAL 3.579545MHZ 17PF

HC49/US

2 Z1, Z2 BEAD CORE SINGLE 3.5X9MM

AXIAL

2 Z3, Z4 FERRITE 300MA 150 OHM 1806 SMD Steward

Note 1: The components listed in this Bill of Materials are rep resent ative of the PCB assembly. The released BOM

used in manufacturing uses all RoHS-compliant components.

NEC PS2501-1

ECS Inc ECS-35-17-4

Panasonic - ECG EXC-ELSA39

Inc. LI1806C151R-10

MCP3905A-I/SS

LM78L05ACM

NOTES:

Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE

AMERICAS

Corporate Office

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03/26/09

Microchip Technology MCP3905A, MCP3906A Reference Design

Specifications and Main Features

Frequently Asked Questions

User Manual

Preface

Chapter 1. Product Overview

Chapter 2. Installation and Operation

FIGURE 2-1: MCP3905A Stand-Alone Energy Meter and Microcontroller-Based Energy Meter Using MCP3905A AFE Design.

FIGURE 2-2: Photograph of Complete, Stand-Alone MCP3905A Energy Meter.

FIGURE 2-3: MCP3905A/06A Energy Meter Reference Des i gn Block Dia gr am .

Appendix A. Schematics and Layouts

Appendix B. Bill Of Materials (BOM)

WORLDWIDE SALES AND SERVICE