Single-Phase Energy Meter
Reference Design
? 2011 Microchip Technology Inc.DS51931A
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PIC18F87J72 SINGLE-PHASE ENERGY METER REFERENCE DESIGN
? 2011 Microchip Technology Inc.DS51931A-page 3Table 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.................................................................................10Chapter 1. Product Overview
1.1 Introduction (11)
1.2 What the PIC18F87J72 Single-Phase Energy Meter Reference Design Kit Includes (12)
1.3 Getting Started .............................................................................................12Chapter
2. Hardware
2.1 Overview (13)
2.2 Input and Analog Front End (16)
2.3 Power Supply Circuit ....................................................................................17Chapter
3. Calculation Engine and Register Description
3.1 Calculation Engine Signal Flow Summary (19)
3.2 Complete Register List (20)
3.3 MODE (21)
3.4 STATUS (22)
3.5 CAL_CONTROL (23)
3.6 LINE_CYC (24)
3.7 LINE_CYC_CNT (24)
3.8 RAW2_I_RMS (24)
3.9 RAW_I_RMS (24)
3.10 I_RMS (25)
3.11 RAW2_V_RMS (25)
3.12 RAW_V_RMS (25)
3.13 V_RMS (25)
3.14 LINE_FREQUENCY (25)
3.15 RAW_POWER_ACT (26)
3.16 POWER_ACT (26)
3.17 POWER_APP (26)
3.18 RAW_POWER_REACT (26)
PIC18F87J72 Single-Phase Energy Meter Reference Design
3.19 POWER_REACT (27)
3.20 PERIOD (27)
3.21 ENERGY_ACT (27)
3.22 ENERGY_APP (27)
3.23 I_ABS_MAX (28)
3.24 V_ABS_MAX (28)
3.25 ENERGY_REACT (28)
3.26 PHASE_COMPENSATION (28)
3.27 OFFSET_I_RMS (28)
3.28 OFFSET_V_RMS (29)
3.29 GAIN_I_RMS (29)
3.30 GAIN_V_RMS (29)
3.31 OFFSET_POWER_ACT (29)
3.32 GAIN_POWER_ACT (29)
3.33 OFFSET_POWER_REACT (30)
3.34 GAIN_POWER_REACT (30)
3.35 GAIN_ENERGY_ACT (30)
3.36 GAIN_ENERGY_APP (30)
3.37 GAIN_ENERGY_REACT (30)
3.38 CF_PULSE_WIDTH (31)
3.39 GAIN_DENR_ENERGY_ACT (31)
3.40 GAIN_NUMR_ENERGY_ACT (31)
3.41 METER_CONFIG (31)
3.42 CAL_STATUS (32)
3.43 MAXIMUM CURRENT (32)
3.44 CALIBRATION_VOLTAGE (32)
3.45 CALIBRATION_CURRENT (32)
3.46 CALIBRATION_FREQUENCY (33)
3.47 METER_CONSTANT (33)
3.48 CALIBRATION_LINE_CYCLE (33)
3.49 GAIN_DENR_ENERGY_REACT (33)
3.50 GAIN_NUMR_ENERGY_REACT (33)
3.51 PHASE_COMPENSATION_90 (33)
3.52 CREEP_THRSHOLD_MINUTE (34)
3.53 CREEP_THRSHOLD_SECOND (34)
3.54 ENERGY_ACT_FORWARD (34)
3.55 ENERGY_ACT_REVERSE (34)
3.56 ENERGY_REACT_INDUCTIVE (34)
3.57 ENERGY_REACT_CAPACITIVE (35)
DS51931A-page 4? 2011 Microchip Technology Inc.
Appendix A. Schematic and Layouts
A.1 Introduction (37)
A.2 Schematics and PCB Layout (37)
A.3 Board – Schematic (38)
A.4 Board – Schematic Top Silk and Boarder Outline (39)
A.5 Board – Top Silk (40)
A.6 Board – Top Trace and Pads (41)
A.7 Board – Bottom Silk (42)
A.8 Board – Bottom Trace and Pads (43)
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service (50)
? 2011 Microchip Technology Inc.DS51931A-page 5
PIC18F87J72 Single-Phase Energy Meter Reference Design NOTES:
DS51931A-page 6? 2011 Microchip Technology Inc.
PIC18F87J72 SINGLE-PHASE 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 (https://www.wendangku.net/doc/ac5972614.html,) 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? IDE on-line help.
Select the Help menu, and then Topics to open a list of available online help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
PIC18F87J72 Single-Phase 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
? 2011 Microchip Technology Inc.DS51931A-page 7
PIC18F87J72 Single-Phase Energy Meter Reference Design
DOCUMENT LAYOUT
This document describes how to use the PIC18F87J72 Single-Phase Energy Meter
Reference Design as a development tool to emulate and debug firmware on a target
board. The manual layout is as follows:
?Chapter 1.“Product Overview” – Important information on using the
PIC18F87J72 Single-Phase Energy Meter Reference Design including a getting
started section that describes wiring the line and load connections.
?Chapter 2.“Hardware” – Includes detail on the function blocks of the meter
including the analog front end design, and power supply design.
?Chapter 3.“Calculation Engine and Register Description” – This section
describes the digital signal flow for all power output quantities such as RMS
current, RMS voltage, active power, and apparent power. This section also
includes the calibration registers detail.
?Appendix A.“Schematic and Layouts” – Shows the schematic and layout
diagrams
?Appendix B.“Bill of Materials (BOM)” – Lists the parts used to build the
PIC18F87J72 Single-Phase Energy Meter Reference Design.
DS51931A-page 8? 2011 Microchip Technology Inc.
Preface
? 2011 Microchip Technology Inc.DS51931A-page 9
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
“Save project before build”Underlined, italic text with right angle bracket A menu path
File>Save Bold characters A dialog button
Click OK A tab
Click the Power tab N‘Rnnnn A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
4‘b0010, 2‘hF1Text in angle brackets < > A key on the keyboard
Press
#define START Filenames
autoexec.bat File paths
c:\mcc18\h Keywords
_asm, _endasm, static Command-line options
-Opa+, -Opa-Bit values
0, 1Constants
0xFF, ‘A’Italic Courier New A variable argument
file .o , where file can be any valid filename Square brackets [ ]Optional arguments
mcc18 [options] file [options]Curly brackets and pipe character: { | }Choice of mutually exclusive
arguments; an OR selection
errorlevel {0|1}Ellipses...Replaces repeated text var_name [,
var_name...]
Represents code supplied by user void main (void)
{ ...
}
PIC18F87J72 Single-Phase Energy Meter Reference Design
RECOMMENDED READING
This user’s guide describes how to use the PIC18F87J72 Single-Phase Energy Meter
Reference Design. Other useful documents are listed below. The following Microchip
documents are available and recommended as supplemental reference resources.
PIC18F87J72 Family Data Sheet – “80-Pin, High-Performance Microcontrollers
with Dual Channel AFE, LCD Driver and nanoWatt Technology“ (DS39979)
This data sheet provides detailed information regarding the PIC18F87J72 device.
“Single-Phase Energy Meter Calibration User’s Guide” (DS51964)
THE MICROCHIP WEB SITE
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Accessible by using your favorite Internet browser, the web site contains the following
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CUSTOMER SUPPORT
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?Field Application Engineer (FAE)
?Technical Support
Customers should contact their distributor, representative or field application engineer
(FAE) for support. Local sales offices are also available to help customers. A listing of
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Technical support is available through the web site at: https://www.wendangku.net/doc/ac5972614.html,
DOCUMENT REVISION HISTORY
Revision A (March 2011)
?Initial Release of this Document.
DS51931A-page 10? 2011 Microchip Technology Inc.
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