MCP3909
and PIC18F85J90
Single Phase Energy Meter
Reference Design
© 2009 Microchip Technology Inc.
DS51884A
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DS51884A-page 2
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Table of Contents
Preface ........................................................................................................................... 5
Introduction............................................................................................................ 5
Document Layout .................................................................................................. 6
Conventions Used in this Guide ............................................................................ 7
Recommended Reading........................................................................................ 8
The Microchip Web Site ........................................................................................ 8
Customer Support ................................................................................................. 8
Document Revision History ................................................................................... 8
Chapter 1. Product Overview
1.1 Introduction ..................................................................................................... 9
1.2 What the MCP3909/PIC18F85J90 Single Phase Energy Meter Reference
Design Kit Includes ................................................................................. 10
1.3 Getting Started ............................................................................................. 11
Chapter 2. Hardware
2.1 Input and Analog Front End ......................................................................... 13
2.2 Power Supply Circuit .................................................................................... 14
2.3 Microcontroller connections .......................................................................... 15
Chapter 3. PIC18F85J90 Calculation and Register Description
3.1 Register Overview ........................................................................................ 17
3.2 active energy calculation .............................................................................. 18
3.3 Complete Register List ................................................................................. 19
3.4 Configuration And Output Registers ............................................................. 20
3.5 Calibration Registers .................................................................................... 27
Chapter 4. Meter Protocol and Timings
4.1 PIC18F85J90 Protocol ................................................................................. 31
Chapter 5. Meter Calibration
5.1 Calibration Overview .................................................................................... 33
5.2 Active Power Signal Flow and Calibration .................................................... 35
5.3 RMS Current, RMS Voltage, Apparent Power Signal Flow and Calibration . 36
© 2009 Microchip Technology Inc.
DS51884A-page 3
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 49
A.2 Board Schematic - Page 1 ........................................................................... 50
A.3 Board Schematic - Page 2 ........................................................................... 51
A.4 Board Schematic - Page 3 ........................................................................... 52
A.5 Board - Top Layer And Silk-screen .............................................................. 53
A.6 Board - Top Copper ..................................................................................... 54
A.7 Board - Bottom Layer and Silk-screen ........................................................ 55
A.8 Board - Bottom Copper ................................................................................ 56
Appendix B. Bill of Materials
Worldwide Sales and Service .....................................................................................60
DS51884A-page 4
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 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
(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® IDE on-line help.
Select the Help menu, and then Topics to open a list of available on-line help files.
INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP3909/PIC18F85J90 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
© 2009 Microchip Technology Inc.
DS51884A-page 5
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
DOCUMENT LAYOUT
This document describes how to use the MCP3909/PIC18F85J90 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 MCP3909
3-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, phase lock loop circuitry, and power supply
design.
• Chapter 3. “PIC18F85J90 Calculation 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.
• Chapter 4. “Meter Protocol and Timings”– Here is described the protocol used
for accessing the registers includes commands that are used to interface to the
meter.
• Chapter 5. “Meter Calibration” – This chapter provides detail on how to
calibrate the meter. The PC calibration software that is included with the meter
automates the steps and calculations described in this chapter.
• .Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams
• Appendix B. “Bill of Materials” – Lists the parts used to build the meter.
DS51884A-page 6
© 2009 Microchip Technology Inc.
Preface
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
Represents
Examples
Referenced books
Emphasized text
A window
A dialog
A menu selection
A field name in a window or
dialog
A menu path
MPLAB® IDE User’s Guide
...is the only compiler...
the Output window
the Settings dialog
select Enable Programmer
“Save project before build”
A dialog button
A tab
A number in verilog format,
where N is the total number of
digits, R is the radix and n is a
digit.
A key on the keyboard
Click OK
Click the Power tab
4‘b0010, 2‘hF1
Italic Courier New
Sample source code
Filenames
File paths
Keywords
Command-line options
Bit values
Constants
A variable argument
Square brackets [ ]
Optional arguments
Curly brackets and pipe
character: { | }
Ellipses...
Choice of mutually exclusive
arguments; an OR selection
Replaces repeated text
#define START
autoexec.bat
c:\mcc18\h
_asm, _endasm, static
-Opa+, -Opa0, 1
0xFF, ‘A’
file.o, where file can be
any valid filename
mcc18 [options] file
[options]
errorlevel {0|1}
Initial caps
Quotes
Underlined, italic text with
right angle bracket
Bold characters
N‘Rnnnn
Text in angle brackets < >
Courier New font:
Plain Courier New
Represents code supplied by
user
© 2009 Microchip Technology Inc.
File>Save
Press <Enter>, <F1>
var_name [,
var_name...]
void main (void)
{ ...
}
DS51884A-page 7
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
RECOMMENDED READING
This user's guide describes how to use MCP3909/PIC18F85J90 Single Phase Energy
Meter Reference Design. Other useful documents are listed below. The following
Microchip documents are available and recommended as supplemental reference
resources.
MCP3909 Data Sheet, “Energy Metering IC with SPI Interface and Active Power
Pulse Output“ (DS22025)
This data sheet provides detailed information regarding the MCP3909 device.
AN994 Application Note “IEC61036 Meter Design using the MCP3905A/06A
Energy Metering Devices” (DS00994)
This application note documents the design decisions associated with using the
MCP390X devices for energy meter design and IEC compliance.
THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser, the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
•
•
•
•
Distributor or Representative
Local Sales Office
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
sales offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com
DOCUMENT REVISION HISTORY
Revision A (December 2009)
• Initial Release of this Document.
DS51884A-page 8
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design is a fully
functional single phase meter. The design is intended to be low cost and is
transformerless. The design uses a half-wave rectified power supply circuit and a shunt
current sensing element. A single MCP3909 acts as the analog front end measurement
circuitry. The PIC18F85J90 directly drives the LCD glass and displays active energy
consumption.
The meter design contains serially accessible registers and is intended to be flexible
and upgraded to a variety of PIC® micro-based energy meter designs using the
firmware presented herein. The “Single Phase Energy Meter Software” offers a
functional and simple means to monitor and control the PIC18F85J90 and can be used
to create custom calibration setups. In some situations, only a single point calibraton
may be required. The energy meter software offers an automated step by step
calibration process that can be used to quickly calibrate energy meters.
FIGURE 1-1:
Design.
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference
DS51884A-page 9
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
RS-232
RX / TX
Active Reactive
Power Power
In-Circuit Programming
KWH
PIC18F85J90
SPI
MCP3909
FIGURE 1-2:
1.2
25LC256
Power Supply &
Protection Circuitry
Functional Block Diagram.
WHAT THE MCP3909/PIC18F85J90 SINGLE PHASE ENERGY METER
REFERENCE DESIGN KIT INCLUDES
This MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design Kit
includes:
• MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design,
102-00130
• Important Information Sheet
DS51884A-page 10
© 2009 Microchip Technology Inc.
Product Overview
1.3
GETTING STARTED
To describe how to use the MCP3909/PIC18F85J90 Single Phase Energy Meter
Reference Design, the following example is given using a 2-Wire 1-phase, 220V AC
line voltage and connections using an energy meter calibrator equipment or other
programmable load source. The meter design uses a 5A load for calibration current
and a maximum current (IMAX) of 10A.
All connections described in this section are dependent on the choice of current
sensing element and a secondary external transformer may be required in higher
current meter designs.
For testing a calibrated meter, the following connections apply for a 4-wire connection.
1.3.1
Step 1: Wiring connections
1
2
3
4
Line
Line
Neutral
Neutral
MAIN
LOAD
FIGURE 1-3:
1.3.2
Example Connections using a 4-Wire System.
Step 2: Turn On Line/Load Power to the Meter (Power the Meter)
The meter will turn on when the line connection has 220V connected. The LCD display
will show total energy accumulated.
© 2009 Microchip Technology Inc.
DS51884A-page 11
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
NOTES:
DS51884A-page 12
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Chapter 2. Hardware
2.1
INPUT AND ANALOG FRONT END
This meter comes populated with components designed for 220V line voltage. At the
bottom of the main board are the high voltage line and neutral connections. There are
four total connections that are made from the PCB to the meter casing, labeled as
LINE, NEUTRAL, SHUNT1 and SHUNT2. The shunt sits on the high or line side of a
two wire system and the meter employes a hot or “live” ground. The wires going into
the shunt to SHUNT1 and SHUNT2 should be twisted together. The wires going into
the LINE and NEUTRAL side of the meter should also be twisted together and kept
away from the SHUNT1 and SHUNT2 wires if possible.
The neutral side of the 2-wire system goes into a resistor divider on the voltage channel
input. Anti-aliasing low-pass filters will be included on both differential channels. The
voltage channel uses two 332 kΩ resistors to achieve a divider ratio of 664:1. For a line
voltage of 230 VRMS, the channel 1 input signal size will be 490 mVPEAK. The current
channel of each phase uses current transformer with a turns ratio of 2000:1 and burden
resistance of 56.4 kΩ. The resulting channel 0 signal size is 340 mVPEAK for 20A, or
twice the rated maximum current of the meter, still within the input range of the A/D
converter of the MCP3909.
150 FB (Note)
1.0 kΩ
CH0+
LINE_SHUNT1
68 nF
Shunt
(external to
PCB part of
meter case)
MCP3909
150 FB (Note)
1.0 kΩ
CH0-
LINE_SHUNT2
68 nF
332 kΩ 332 kΩ
0Ω
NEUTRAL
CH1+
68 nF
1.0 kΩ
10 step optional
resistor
ladder
1.0 kΩ
CH1+
68 nF
Note:
FIGURE 2-1:
FB = ferrite beads. Ferrite beads have an impedance of the
specified value at 100 MHz.
Analog Front End, Phase A Connections and Reference Designators shown.
© 2009 Microchip Technology Inc.
DS51884A-page 13
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
2.2
POWER SUPPLY CIRCUIT
The power supply circuit for the MCP3909/PIC18F85J90 Single Phase Energy Meter
Reference Design uses a half wave rectified signal and a single +5V voltage regulator,
and a 3.3V LDO.
1
3
2
+9V DS Power In
(DO NOT USE WHILE
METER IS CONNECTED
TO MAINS!)
+5V
150 FB (Note)
1 uF
470Ω
NEUTRAL
Out
100 nF
Gnd
10 uF
1uF
LINE
A
A
A
B
+3.3V
+5V
In
100 nF
100 nF
B
DS51884A-page 14
Out
EN
Byp
Gnd
100 nF
FIGURE 2-2:
A
A
B
B
B
B
Low-Cost Power Supply Circuit.
© 2009 Microchip Technology Inc.
Hardware
2.3
MICROCONTROLLER CONNECTIONS
PIC18F85J90
RH4
RH5
ACTIVE
REACTIVE
POWER (FUTURE)
POWER
RC7/RX
UART - PC
RC6/TX
MAX3323
RA2
RA3
RC2/CCP1
G1
ANALOG FRONT END MCLK
RA0
G0
MCLR
RJ7
CS
RC3/SCK
SCK
RC5/SDO
SDI
RC4/SDI
SDO
HPF1
16-bit
Multi-level
ΔΣ ADC
+
PGA
–
CH0+
CH0-
16-bit
Multi-level
ΔΣ ADC
+
HPF1
CH1+
CH1-
–
MCP3909
SPI - EEPROM
SCK
SDO
SDI
CS
RA0
25LC256
FIGURE 2-3:
RB4
SWITCH
RB5
SWITCH
MCP3909/PIC18F85J90 Digital Connections.
© 2009 Microchip Technology Inc.
DS51884A-page 15
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
NOTES:
DS51884A-page 16
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Chapter 3. Calculation and Register Description
3.1
REGISTER OVERVIEW
The PIC18F85J90 contains registers that are used during calibration and registers that
can be read through the UART. The registers are named to describe each phase,
specific measurement, and in the case of the calibration registers, the calibration
function.
The intent of the calibration process is to yield output registers that are decimal
representation of the final energy, power, current or voltage value.
Instantaneous Power Registers
The PHy_W and PHy_VA registers contain the decimal representation of the active
power (W) and apparent power (VA) post calibration. The reactive power calculation is
not implemented at this time.
The final correction factors to convert these registers to units of energy are located in
the _GLSB registers. These correction factors can be automatically calculated and
loaded by using the PC calibration software. The exact representation depends on the
meter values that are entered in the software. For example, at 10A and 220V, power in
the PHy_W register is 0.1 mW/LSB.
Calibration Registers
The calibration registers fall into one of three categories: offset, gain, and LSB, denoted
by _OFF, _GAIN and _GLSB register names.
In addition there are two registers, CFNUM and CFDEN, that calibrate the output pulse,
CF.
© 2009 Microchip Technology Inc.
DS51884A-page 17
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.2
ACTIVE ENERGY CALCULATION
Active Energy is described through the process described in Figure 3-1. The calibration
registers for each calculation are shown as well as the output registers.
ADC
PHA_W_OFF:32
CURRENT
PHA_DELAY:8
ADC
/
Digital to
Frequency
Converter
CF OUTPUT
FREQUENCY ON PIN
PHA_W:32
CF_DEN:16
CF_NUM:16
X
2
X
X
ENERGY_W_GLSB:16
Φ
VOLTAGE
Σ
1
PHA_W_GLSB:16
X
PHA_W:48
MCP3909
ENERGY_W_LRAW:48
ENERGY_W_Z:64
ENERGY_W:64
PHA_W_RAW:48
PERIOD:16
PGA
ENERGY_W_L:64
kWh (Displayed on LCD)
FIGURE 3-1:
DS51884A-page 18
Active Energy Calculation.
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.3
COMPLETE REGISTER LIST
TABLE 3-1:
INTERNAL REGISTER SUMMARY
Address
Name
Bits
R/W
0x000
MODE1
16
R/W
Description
0x002
RESERVED
16
—
Reserved
0x004
STATUS1
16
R
Status Register
Configuration register for operating mode of the meter
0x006
RESERVED
16
—
0x008
CAL_CONTROL
16
R/W
Configuration register for calibration control
Reserved
0x00A
LINE_CYC
16
R/W
2nd number of line cycles to be used during energy accumulation
0x00C
LINE_CYC_CNT
16
R
Counter for number of line cycles
0x00E
RESERVED
16
—
Reserved
0x04F
RESERVED
8
—
Reserved
0x064
PHA_W_RAW
48
R
Raw phase A active power
0x076
PHA_W
32
R
Final Phase A active power, units in watts (W)
0x0A0
PHA_VAR_RAW
48
R
Not implemented
0x0B2
PHA_VAR
32
R
Not implemented
0x0BE
RESERVED
16
—
Not implemented
0x0C0
PERIOD
32
R
Period register
0x0C4
ENERGY_W
64
R
Total active energy accumulated
0x0CC
ENERGY_W_Z
64
R
Total active energy accumulated since last read of this register
0x0D4
ENERGY_W_L_RAW
48
R
Total energy accumulated over last LINE_CYC line cycles
0x0DA
ENERGY_W_L
32
R
Not implemented
0x0FE
RESERVED
16
—
Reserved
0x100
ENERGY_VAR
64
R
Not implemented
0x108
ENERGY_VAR_Z
64
R
Not implemented
0x116
ENERGY_VAR_L
32
R
Not implemented
0x11A
Reserved
272
—
Reserved
0x13C
Reserved
16
—
Reserved
0x13E
Reserved
16
—
Reserved
0x13F
End
—
—
End of PIC18F85J90 RAM
8
R/W
CALIBRATION REGISTERS
0x140
PHA_DELAY
Phase A delay (delay between voltage and current, voltage is time shifted)
0x143
RESERVED
8
—
0x170
PHA_W_OFF
32
R/W
Active power offset, Phase A
Reserved
0x17C
PHA_W_GAIN
16
R/W
Active power gain adjust for Phase A, for CF matching
0x182
PHA_W_GLSB
16
R/W
Active power gain adjust for Phase A, to produce X W/LSB
Not implemented
0x194
PHA_VAR_GAIN
16
R/W
0x19A
PHA_VAR_GLSB
16
R/W
Not implemented
0x1A0
ENERGY_W_GLSB
16
R/W
Not implemented
0x1A4
ENERGY_VAR_GLSB
16
R/W
Not implemented
0x1A6
CREEP_THRESH
32
R/W
Not implemented
0x1AA
CF_PULSE_WIDTH
8
R/W
Defines CF pulse width from 0 to 255 * 1.25 ms for 50 Hz. For 60 Hz line 0
to 255 * 1.042 ms
0x1AB
RESERVED
8
—
0x1AC
CFDEN
8
R/W
0x1AD
RESERVED
8
—
0x1AE
CFNUM
16
R/W
CF Calibration Pulse correction factor
0x1B0
MODE1DEF
16
R/W
Power Up Configuration Register
0x1B2
PHA_CAL_STATUS
16
R/W
Status of Phase A Calibration
0x1B8
STAND_W_RAW
48
R/W
Standard Phase Active Power Reading (place holder register used during
calibration for gain matching)
© 2009 Microchip Technology Inc.
Reserved
CF Calibration Pulse correction factor
Reserved
DS51884A-page 19
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.4
CONFIGURATION AND OUTPUT REGISTERS
3.4.1
MODE1 Register
REGISTER 3-1:
Name
MODE1 REGISTER
Bits
Address
Cof
0x000
R/W
The mode register controls the operation of the energy meter. The bit functions are
defined below.
MODE1
16
R/W-0
R/W
R/W
R/W
R/W
U-0
U-0
U-0
APP2
APP1
APP0
ACT1
ACT0
—
—
—
bit 15
bit 8
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
PGA1
PGA0
CF_C
CF_B
CF_A
ABSOLUTE
PHASE
CREEP
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 13-15
APP: Apparent Power Calculation Mode Bits (not implemented)
bit 11-12
ACT: Active Power Calculation Mode Bits (not implemented)
bit 8-10
Unimplemented: Read as ‘0’
bit 6-7
PGA: PGA Bits (not implemented)
bit 3-5
CF Phase y: Active Energy CF Phase Enable Bits
1 = Enabled to be accumulated into the total energy registers or CF pulse output
0 = Disabled and is not acculated into the total energy registers or CF pulse output
bit 2
Absolute: Positive Only Energy Accumulation Mode
1 = Positive Energy Only
0 = Both negative and positive energy accumulated (negative energy is subtracted)
bit 1
Phase: The Phase Bit
1 = Single Point Phase Correction
0 = Multi-Point Phase Correction (future)
bit 0
CREEP: No-Load Threshold Bit
1 = Enabled
0 = Disabled
DS51884A-page 20
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.4.2
STATUS1 Register
REGISTER 3-2:
Name
STATUS1 REGISTER
Bits
Address
Cof
STATUS1
16
0x004
R
The STATUS1 register contains the operational status of the energy meter. The bit
functions are defined below.
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
R
U-0
U-0
—
—
—
—
—
PHA_S
—
—
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-3
Unimplemented: Read as ‘0’
bit 2
PHA_S: Phase A Sign Bit. This is the sign bit of raw active power before absolute value taken
(if enabled, see MODE1 bits).
Negative active power, this may indicate the CT is wired in backwards
1=
0=
bit 1-0
Operation Normal
Unimplemented: Read as ‘0’
© 2009 Microchip Technology Inc.
DS51884A-page 21
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.4.3
CAL_CONTROL Register
REGISTER 3-3:
CAL_CONTROL Register
Name
Bits
Address
Cof
CAL_CONTROL
16
0x008
R/W
This is the calibration mode control register. Bit 0 enables calibration mode. When bit 1
is set high, the energy accumulation registers are updated for LINE_CYC line cycles.
After this time, bit 1 is set low by the PIC18F85J90 and the update of the energy
accumulation registers will stop. This allows the calibration software to set bit 0, clear
the registers, set bit 1, and then start reading the energy accumulation registers as well
as this register to check the status of bit 1. When bit 1 goes low, then LINE_CYC lines
cycles have passed and the energy accumulation registers are final. Note that bit 0
takes effect immediately and bit 1 will take effect on the very next line cycle. When bit 1
goes low, all energy accumulation registers will be ready to read. While in calibration
mode, those registers that are used as part of the meter calibration and normally
dependent on calibration registers will not be dependent while in calibration mode. For
example, PHA_W_RAW is not dependent on PHA_W_OFF in calibration mode.
U-0
U-0
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
—
—
—
bit 15
bit 8
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
R/W-0
—
—
—
—
—
Reserved
CAL_Update
Cal_Mode
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-3
Unimplemented: Read as ‘0’
bit 2
Reserved:
bit 1
CAL_UPDATE: Calbration Update Bit
Power and energy registers updated for LINE_CYC line cycles when set. Bit must be set for registers
to begin updating, which starts on the next line cycle after bit is set.
1 = When CAL_MODE bit is set, set this bit to enable update of power and energy registers
starting on next line cycle
0 = When CAL_MODE bit is set and this bit has been set, this bit will be cleared after
LINE_CYC line cycles. At that point, all registers will be updated, and no further updates
will be done until this bit is set again or CAL_MODE bit is cleared
bit 0
CAL_MODE: Calibration Mode Bit
This bit enables calibration mode.
1 = Calibration Mode Enabled
0 = Calibration Mode Disabled
DS51884A-page 22
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.4.4
LINE_CYC
REGISTER 3-4:
LINE_CYC REGISTER
Name
Bits
Address
Cof
LINE_CYC
16
0x00A
R/W
Number of line cycles as a power of two. A setting of 0 indicates 20 or 1 line cycle. A
setting of 1 is 2 line cycles (21), a setting of 2 is 4 lines cycles (22), up to a setting of 8
which is 256 line cycles. When written, this register will not take effect until the previous
number of line cycles has been acquired.
3.4.5
LINE_CYC_CNT
REGISTER 3-5:
LINE_CYC_CNT REGISTER
Name
Bits
Address
Cof
LINE_CYC_CNT
16
0x00C
R
This register counts from 0 and finishes at 2 (LINE_CYC) -1 and then re-starts at 0, where
LINE_CYC represents the value in the LINE_CYC register.
3.4.6
PHA_W_RAW
REGISTER 3-6:
PHA_W_RAW REGISTER
Name
Bits
Address
Cof
PHA_W_RAW
48
0x064
R
These registers are the raw phase A active power as it represents the sum of each
phase y current A/D value times phase y voltage A/D value results over LINE_CYC line
cycles (each line cycle has 128 results). Each current times voltage multiplication
results in a 32-bit word. There are up to 256 line cycles with each line cycle being
128 results and each result being 32-bit. Thus, a 48-bit register is needed. This is the
register to be read during calibration for calculating the offset and gain values
associated with active phase y power, PHy_W_OFF, PHy_W_GAIN, and
PHy_W_GLSB. These registers are overwritten every line cycle, however if calibration
is enabled, updates will stop once LINE_CYC line cycles have elapsed.
3.4.7
PHA_W
REGISTER 3-7:
PHA_W REGISTER
Name
Bits
Address
Cof
PHA_W
32
0x076
R
These registers are the value for phase A active power. The goal of calibration is to get
these registers values to equal X 0.1 mW/LSB. When displaying the active power for
phase y, simply display the value in these registers with the decimal point one digit in
from the right, in milli-watts. (Note this decimal point location, or LSB resolution of
0.1 mW, is specific for the 5(10)A, 220V rating that this meter is designed for). This
register is overwritten every LINE_CYC line cycles (written only once if calibration is
enabled).
© 2009 Microchip Technology Inc.
DS51884A-page 23
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.4.8
PHA_VAR_RAW (NOT IMPLEMENTED)
REGISTER 3-8:
PHA_VAR_RAW REGISTER
Name
Bits
Address
Cof
PHA_VAR_RAW
48
0x0A0
R
This is the raw phase A reactive power. This is the register to be read during calibration
for calculating the gain values associated with reactive phase y power,
PHA_VAR_GAIN and PHA_VAR_GLSB. This register is overwritten every LINE_CYC
line cycles (written only once if calibration is enabled).
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.4.9
PHA_VAR (NOT IMPLEMENTED)
REGISTER 3-9:
PHA_VAR REGISTER
Name
Bits
Address
Cof
PHA_VAR
32
0x0B2
R
This is the value for phase A reactive power. The goal is to get this value to equal
X VAR/LSB. This is done with the PHA_VAR_GLSB registers. When displaying the
reactive power for phase A, simply display the value in these registers with the decimal
point one digit in from the right, in milli-volt-amperes-reactive. (Note this decimal point
location, or LSB resolution of 0.1 mVAR, is specific for the 5(10)A, 220V rating that this
meter is designed for). This register is overwritten every LINE_CYC line cycles (written
only once if calibration is enabled).
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.4.10
PERIOD
REGISTER 3-10:
PERIOD REGISTER
Name
Bits
Address
Cof
PERIOD
32
0x0C0
R
This 32-bit register represents the total number of clock ticks that elapsed over the most
recent LINE_CYC line cycles. Each LSB represents 1.6 us with a 40 MHz clock on the
microcontroller. This register is overwritten every LINE_CYC line cycles (written only
once if calibration is enabled).
DS51884A-page 24
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.4.11
ENERGY_W_
REGISTER 3-11:
ENERGY_W_ REGISTERS
Name
Bits
Address
Cof
ENERGY_W
64
0x0C4
R
ENERGY_W_Z
64
0x0CC
R
ENERGY_W_L
32
0x0DA
R
ENERGY_W_L_RAW
48
0x0D4
R
These four registers represent the total active energy accumulated. The
ENERGY_W_L_RAW register is the total active energy accumulated over the previous
LINE_CYC line cycles.
Accumulation is done every line cycle and is:
EQUATION 3-1:
PHA_W_GAIN
ENERGY_W = ENERGY_W + ( PHA_W_RAW + PHA_W_OFF ) • ⎛ ------------------------------------⎞
⎝
⎠
32768
PHB_W_GAIN
+ ( PHB_W_RAW + PHB_W_OFF ) • ⎛⎝ ------------------------------------⎞⎠
32768
PERIOD
PHC_W_GAIN
⎛
+ ( PHC_W_RAW + PHC_W_OFF ) • -------------------------------------⎞ • ----------------------⎝
⎠
65536
32768
Where:
PERIOD
=
the period (in 1.6 µs clock ticks) for the most recent line cycle.
During calibration, ENERGY_W_Z, ENERGY_W, and ENERGY_W_L_RAW will all
have the same value.
Also, during calibration, the PHA_W_OFF register additions are skipped and the
PHA_W_GAIN values are all set to their default value of 0x4000 (16,384).
The ENERGY_W_L_RAW register is the register that should be read when calibrating
CFNUM and CFDEN.
This register is updated every line cycle (updating ends once LINE_CYC line cycles
have passed if calibration is enabled).
© 2009 Microchip Technology Inc.
DS51884A-page 25
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.4.12
ENERGY_VA_
REGISTER 3-12:
ENERGY_VA_ REGISTERS
Name
Bits
Address
Cof
ENERGY_VA
64
0x0DE
R
ENERGY_VA_Z
64
0x0E6
R
ENERGY_VA_L
32
0x0F4
R
ENERGY_VA_L_RAW
48
0x0EE
R
These four registers represent the total apparent energy accumulated so far. Energy
from each LINE_CYC line cycles is:
EQUATION 3-2:
ENERGY_VA = ENERGY_VA + ( PHA_I_RMS_RAW
---------------------------------------⎞
• PHA_V_RMS_RAW ) • ⎛⎝ PHA_VA_GAIN
⎠
32768
+ ( PHB_I_RMS_RAW
---------------------------------------⎞
• PHB_V_RMS_RAW ) • ⎛⎝ PHB_VA_GAIN
⎠
32768
+ ( PHC_I_RMS_RAW
---------------------------------------⎞
• PHC_V_RMS_RAW ) • ⎛⎝ PHC_VA_GAIN
⎠
32768
PERIOD • 128
• -------------------------------------65536
Where:
PERIOD
=
the period (in 1.6 µs clock ticks) for the most recent LINE_CYC
line cycles.
Note that during calibration, this value, ENERGY_VA_Z, and ENERGY_VA_L_RAW
will all have the same value.
This register is updated every LINE_CYC line cycles (updating ends after first update
if calibration is enabled).
3.4.13
ENERGY_VAR (NOT IMPLEMENTED)
REGISTER 3-13:
ENERGY_VAR REGISTER
Name
Bit
Address
Cof
ENERGY_VAR
64
0x100
R
ENERGY_VAR_Z
64
0x108
R
ENERGY_VAR_L
32
0x116
R
ENERGY_VAR_L_RAW
48
0x110
R
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
DS51884A-page 26
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.5
CALIBRATION REGISTERS
The calibration register set contains all of the offset, gain, LSB adjust, phase delay, and
calibration output pulse adjustment settings. The values to be placed in these
configuration registers come during meter calibration and can be automatically
generated using the “3-Phase Meter Calibration Software” available for download on
Microchip’s website.
3.5.1
PHA_DELAY
REGISTER 3-14:
PHA_DELAY REGISTER
Name
Bit
Address
Cof
PHA_DELAY
8
0x140
R/W
Phase A delay, signed 8-bit value, ±2.8125 degrees
(±130 µs for 60 Hz, ±156 µs for 50 Hz)
3.5.2
PHA_W_OFF
REGISTER 3-15:
PHA_W_OFF REGISTER
Name
Bits
Address
Cof
PHA_W_OFF
32
0x170
R/W
Phase A active power offset (this is straight offset, not the square as with voltage and
current). A much larger value is need because the power is a running sum. This is a
32-bit signed value.
3.5.3
PHA_W_GAIN
REGISTER 3-16:
PHA_W_GAIN REGISTER
Name
Bits
Address
Cof
PHA_W_GAIN
16
0x17C
R/W
Phase A active power gain so that all results can be calibrated to produce equal CF
pulses/watt-hour. The signed 16-bit number produces a change in the PHA_W_RAW
value before being added to the energy registers. A value of 32,767 represents a
99.9939% increase while a value of 8192 represents a decrease of 50%.
3.5.4
PHA_W_GLSB
REGISTER 3-17:
PHA_W_GLSB REGISTER
Name
Bits
Address
Cof
PHA_W_GLSB
16
0x182
R/W
Phase A active power gain to produce X W/LSB. The value is always less than one (for
example, 32,767 = 0.9999695).
3.5.5
PHA_VAR_GAIN (NOT IMPLEMENTED)
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.5.6
PHA_VAR_GLSB (NOT IMPLEMENTED)
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
© 2009 Microchip Technology Inc.
DS51884A-page 27
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
3.5.7
ENERGY_W_GLSB (NOT IMPLEMENTED)
REGISTER 3-18:
ENERGY_W_GLSB REGISTER
Name
Bits
Address
Cof
ENERGY_W_GLSB
16
0x1A0
R/W
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.5.8
ENERGY_VAR_GLSB (NOT IMPLEMENTED)
REGISTER 3-19:
ENERGY_VAR_GLSB REGISTER
Name
Bits
Address
Cof
ENERGY_VAR_GLSB
16
0x1A4
R/W
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.5.9
CREEP_THRESH (NOT IMPLEMENTED)
REGISTER 3-20:
CREEP_THRESH REGISTER
Name
Bits
Address
Cof
CREEP_THRESH
32
0x1A6
R/W
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.5.10
CF_PULSE_WIDTH
REGISTER 3-21:
CF_PULSE_WIDTH REGISTER
Name
Bits
Address
Cof
CF_PULSE
8
0x1AA
R/W
Defines CF pulse width from 0 to 255. Length of width is value * 8 * (1/LINEFREQ) /
128) ms. A maximum of 0.266 seconds for 60 Hz and 0.319 seconds for 50 Hz.
If the value is 0, no CF pulse is produced.
3.5.11
CFDEN
REGISTER 3-22:
CFDEN REGISTER
Name
Bits
Address
Cof
CF_DEN
16
0x1AC
R/W
8-bit signed value. Represents the number of shifts for active power energy register
ENERGY_W_L before CFNUM is applied.
3.5.12
CFNUM
REGISTER 3-23:
CFNUM REGISTER
Name
Bits
Address
Cof
CF_NUM
16
0x1AE
R/W
Active power gain to produce a specified pulses per watt-hour. The value is always less
than one (for example, 32,767 = 0.9999695).
DS51884A-page 28
© 2009 Microchip Technology Inc.
Calculation and Register Description
3.5.13
MODE1_DEF
REGISTER 3-24:
MODE1_DEF REGISTER
Name
Bits
Address
Cof
MODE1_DEF
16
0x1B0
R/W
Mode 1 default power-up settings. On power-up, this register will be read and placed
into the MOD1 register.
3.5.14
PHA_CAL_Status Register
REGISTER 3-25:
PHA_CAL_STATUS REGISTER
Name
Bits
Address
Cof
PHA_CAL_STATUS
16
0x1B2
R/W
The PHASE_A CAL_STATUS registers holds the calibration status for each individual
phase. Broken down by phase, these are the values that can be calibrated. Each bit
has the status of ‘0’ = Not calibrated, ‘1’ = Calibrated.
R/W-0
R/W-0
R/W-0
DELAY
I_RMS_OFF
V_RMS_OFF
R/W-0
R/W-0
I_RMS_GAIN V_RMS_GAIN
R/W-0
R/W-0
R/W-0
I_RMS_GLSB
V_RMS_GLSB
W_OFF
bit 15
bit 8
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
W_GAIN
W_GLSB
VA_GAIN
VA_GLSB
VAR_GAIN
VAR_GLSB
—
STANDARD
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-2
CALIBRATION REGISTER: Calibration register status for offset, gain, LSB, and phase delay
1 = This register has been calibrated
0 = This register is NOT calibrated
bit 1
Unimplemented: Read as ‘0’
bit 0
STANDARD: Standard Phase Bit
1 = Standard Phase is THIS phase
0 = This phase is NOT the standard phase
3.5.15
STANDARD_W_RAW
REGISTER 3-26:
STANDARD_W_RAW REGISTER
Name
Bits
Address
Cof
STANDARD_W_RAW
48
0x1B8
R/W
This calibration register holds the energy value that was accumulated during the
standard phase measurement under calibration configuration C1. The software will
read this value when performing phase to phase gain matching during active power
calibration.
© 2009 Microchip Technology Inc.
DS51884A-page 29
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
NOTES:
DS51884A-page 30
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Chapter 4. Meter Protocol and Timings
4.1
PIC18F85J90 PROTOCOL
The RS-232 port of the PIC18F85J90 is used to access the register map of the meter.
In addition to reading and writing of registers, there are also dedicated commands for
clearing calibration registers, loading calibration registers, and storing calibration
registers to flash. The first byte RS-232 data is an ASCII character that represents the
command, and each command has a specific protocol. Each command ends with the
ASCII character “X”.
4.1.1
Command Description
The first byte of the data (byte 0) is an ASCII character E, L, S, W and R.
•
•
•
•
•
E - Echo All Data Received (ECHO)
L - Load Calibration Registers from Flash (LOAD)
S - Store Calibration Registers (STORE)
W - Write Bytes (WRITE)
R - Read Bytes (READ)
The last data byte is always an 'X' character. All commands will result in the same
command being returned. The exception is the 'R' (read) command which will return
additional data in lieu of the number of bytes.
4.1.1.1
“E” ECHO: - ECHO ALL DATA RECEIVED
Example: 'EABCDEFGHIJKLMNOPQRSTUVWYZ1234567890X'.
Returns: 'EABCDEFGHIJKLMNOPQRSTUVWYZ1234567890X'.
4.1.1.2
“L” LOAD: LOAD CALIBRATION REGISTERS FROM FLASH.
Example: 'LX'.
Returns: 'LX'.
This command is used to verify that the calibration values were actually written into
flash (or EEPROM). Once the software executes a 'SX' command, it should verify that
the values were stored by issuing an 'LX' command and then reading the calibration
values with a 'R' command.
4.1.1.3
“S” STORE: STORE CALIBRATION REGISTERS INTO FLASH
Note that the store command will write all calibration values to internal EEPROM and
this function takes some time. During that time, the meter is not functional. The store
command should only be used after calibrating the meter and not while it is in actual
use.
Example: 'SX'.
Returns: 'SX'.
© 2009 Microchip Technology Inc.
DS51884A-page 31
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
4.1.1.4
“W” WRITE: WRITE STARTING AT SPECIFIED ADDRESS
Write specified bytes.
Example: 'W030000102030405060708090A0B0C0D0E0FX'.
Returns: 'W030000102030405060708090A0B0C0D0E0FX'.
Note:
If number of data characters is odd, the last character (the one just prior to
the 'X') will be ignored.
3 Address Bytes (ASCII)
Command Byte
7
6
5
4
3
2
1
7
0
6
5
4
3
2
1
0
7
6
5
ASCII Data
7
6
5
4
3
2
TABLE 4-1:
1
0
3
2
1
0
7
6
5
4
3
2
1
0
“X” (ASCII)
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
WRITE COMMAND EXAMPLES
Description
WRITE of 255d to
PHA_W_OFF Register
FIGURE 4-1:
4
Command ASCII
Command Hex
“W 170 00 F F X”
57 31 37 30 30 30 46 46 58
WRITE Command Protocol.
4.1.1.5
“R” READ: READ STARTING AT SPECIFIED ADDRESS
Example: 'R03010X' (read 16 bytes starting at address 30h).
Returns: 'R030000102030405060708090A0B0C0D0E0FX'
Note:
For 16 bytes, there are 32 ASCII characters returned or two characters per
byte.
3 Address Bytes (ASCII)
Command Byte
7
6
5
4
3
2
1
0
7
6
5
4
3
2
1
0
7
6
# Bytes to Read (2 Bytes ASCII)
7
6
5
4
TABLE 4-2:
3
2
1
0
7
6
5
4
3
2
3
2
1
0
1
0
7
6
5
4
3
2
1
0
1
0
7
6
5
4
3
2
READ COMMAND EXAMPLES
READ on ENERGY_W_L_RAW Register
DS51884A-page 32
4
“X” (ASCII)
DESCRIPTION
FIGURE 4-2:
5
COMMAND ASCII
COMMAND HEX
“R 0D4 06 X”
52 00 44 34 30 36 58
Read Command Protocol.
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Chapter 5. Meter Calibration
5.1
CALIBRATION OVERVIEW
The method to calculate the values for the calibration registers in “Chapter
3. “PIC18F85J90 Calculation and Register Description” are described in this
chapter. These registers are used to remove offset, set gain and phase adjustments,
and include (units)/LSB adjustments for the meter outputs. The calibration flow charts
and equations presented in this section are all automated using Microchip’s “Single
Phase Energy Meter Calibration Software”, downloadable from Microchip’s energy
metering web site. The following calibration routines are described in this chapter.
• Active Power Calibration
• RMS Current and Voltage Calibration
• Apparent Power Calibration
The method of calibrating these three separate signal flows can be combined into
4 different calibration configurations. These configurations consist of supplying specific
voltages and currents at specific phase angles to the meter during calibration.
Depending on the accuracy and meter type, not all 4 calibration configurations are
required to fully calibrate a meter. In some cases only a single point calibraton is
required. The software allows individual configurations to be turned on or off when
going through the calibration flow.
© 2009 Microchip Technology Inc.
DS51884A-page 33
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.1.1
IB, VB, Meter Constant and Calibration Configurations
Calibration of the single phase energy meter involves up to four different test
configurations.
For example, meter design example 5(10)A, IB = 5, IMAX = 10A.
The four different test configuraitons are listed here: :
1. Configuration C1: Gain - Basic voltage VB and basic current IB at a power factor
of 1.
For example, 220V and 5A.
2. Configuration C2: Phase - Basic voltage VB and basic current IB at a power
factor of 0.5.
3. Configuration C3: Offset - Basic voltage VB and 1/100 of IB at a power factor of
1.
For example, 220V and 50 mA.
4. Configuration C4: Mid-range - 1/10 of Basic voltage VB and 1/10 of IB at a power
factor of 1.
For example, 22V and 1A.
These calibration configurations are typically steps in a sequence. Almost always,
configuration C1 is the most important and must be done first. The other configurations
require values obtained from configuration C1, but are not dependent on values
obtained from the other configurations. In other words, C1 is probably the first step,
while the other configurations can be done in any order, and are optional depending on
the meter type.
The meter constant is typically given in units of impulses per kilo-watt hour. As an
example, the calibration output frequency of CF, METER_CONSTANT =
3200 imp/kWh or 6400 imp/kWh.
DS51884A-page 34
© 2009 Microchip Technology Inc.
Meter Calibration
5.2
ACTIVE POWER SIGNAL FLOW AND CALIBRATION
5.2.1
Active Power Calibration Overview and Signal Path
The active power signal flow leads to the CF output pulse frequency, which is
proportional to the total active power being measured by the energy meter, the active
energy registers, which are in units of kWh and can also be phase gated using the
MODE1 register, and the active power output register (PHA_W).
Table 5-1 represents the registers being set during active power calibration.
TABLE 5-1:
CALIBRATION REGISTERS GENERATED THROUGH THIS ROUTINE
Register Name
Equations
Configurations Needed
CFDEN
Section 5.3.3
C1 ONLY
CFNUM
Section 5.3.3
C1 ONLY
PHA_DELAY
Section 5.3.5
C1, C2
PHA_W_OFF
Section 5.3.7
C1, C3
PHA_W_GLSB
Section 5.3.3
C1 ONLY
ENERGY_W_GLSB
Not Implemented
C1 ONLY
ADC
NOTE 1
CURRENT
PHy_DELAY:8
Σ
X
|X|
Φ
ADC
PHA_W_OFF:32
VOLTAGE
PHA_W_GLSB:16
MCP3909
PHA_W_RAW:48
Digital to
Frequency
Converter
kW
X
PHA_W:32
ENERGY_W_GLSB:16 (NOT IMPLEMENTED)
CFNUM:16
/
CFDEN:8
PERIOD:16 (INTERNAL REGISTER)
ENERGY_W_L:32
ENERGY_W_L_RAW:48
ENERGY_W_Z:64
ENERGY_W:64
FIGURE 5-1:
kWh
X
X
Note 1:
CF OUTPUT
FREQUENCY!
This absolute value is controlled by the MODE1
register. See Section 3.4.1 for more information.
Active Power Signal Path showing Output and Calibration Registers.
© 2009 Microchip Technology Inc.
DS51884A-page 35
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.3
RMS CURRENT, RMS VOLTAGE, APPARENT POWER SIGNAL FLOW AND
CALIBRATION
5.3.1
RMS Current, RMS Voltage, and Apparent Power Overview and
Signal Path
The RMS current and voltage outputs require a two point calibration reading at
configurations C1 and C4. The automated USB software performs these calibrations
suggested on the calibration values entered in the text boxes on the meter design
window.
The following table represents the registers being set for RMS Current and Voltage
calibration.
TABLE 5-2:
RMS CURRENT, RMS VOLTAGE, AND APPARENT POWER
CALIBRATION REGISTERS
Register
Equation
Configurations Needed
PHA_V_RMS_OFF
Section 5.3.9
C1, C4
PHA_I_RMS_OFF
Section 5.3.9
C1, C4
PHA_V_RMS_GLSB
Section 5.3.9
C1, C4
PHA_I_RMS_GLSB
Section 5.3.9
C1, C4
PHA_VA_GLSB
Section 5.3.3
C1 ONLY
ENERGY_VA_GLSB
Not Implemented
C1 ONLY
PHA_I_RMS_OFF:16
ADC
Σ
X2
CURRENT
PHA_I_RMS_RAW:16
X
A
PHA_I_RMS:16
RMS Current
PHA_I_RMS_GLSB:16
PHA_V_RMS_OFF:16
ADC
Σ
X2
VOLTAGE
PHA_V_RMS_GLSB:16
X
V
PHA_V_RMS:16
RMS Voltage
MCP3909
PH_V_RMS_RAW:16
X
PHA_VA_RAW
X
X
ENERGY_VA_GLSB:16
PHA_VA_GAIN:16
ENERGY_VA_L:32
kVAh
X
X
ENERGY_VA_L_RAW:48
ENERGY_VA_Z:64
ENERGY_VA:64
FIGURE 5-2:
DS51884A-page 36
kVA
PERIOD:32 (INTERNAL REGISTER)
PHA_VA_GLSB:16
Apparent Power
PHA_VA:32
RMS Current, Voltage, and Apparent Power Flow.
© 2009 Microchip Technology Inc.
Meter Calibration
5.3.2
Main Flow Chart for Calibration Configuration C1
Begin Calibration
Set MODE1 register
bits and LINE_CYC
register
Put meter in Calibration
Configuration C1
(VB and IB at PF=1)
Enable Calibration Mode
by setting bit 0 and 1 of
CAL_CONTROL register
to 1
Is
CAL_MODE
bit 1 low
?
NO
YES
Read contents of
ENERGY_W_RAW,
PHA_W_RAW
Calculate & Write
CFNUM, CFDEN,
PHA_W_GLSB, and
PHA_VA_GLSB
contents based
equations in
Section 5.3.3
End
FIGURE 5-3:
Main Calibration Flow Chart.
© 2009 Microchip Technology Inc.
DS51884A-page 37
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.3.3
Equations for Configuration C1 Calibration
The following equations represent the proper method for calculating the calibration and
correction factors after configuration C1. The PC calibration software handles these
calculations automatically.
The following equations only apply when calibrating a standard phase.
The first four equations apply for calculating the proper output frequency of the CF output. See Figure 5-3 for meter input conditions.
EQUATION 5-1:
Meter Constant V B I B
CF_IMP_S = ------------------------------------- • -----------1000
3600
EQUATION 5-2:
LINE_CYC_NUM = 2
LINE_CYC
EQUATION 5-3:
32
2 • CF_IMP_S LINE_CYC_NUM • 256
LOG ---------------------------------------- ---------------------------------------------------------Line Freq • 128
ENERGY_W_L_RAW
CFDEN = --------------------------------------------------------------------------------------------------------------------------- + 1
LOG(2)
Note:
Convert to 8-bit signed integer for compatibility with PIC18F2520 register
and firmware calculations.
EQUATION 5-4:
32
• CF_IMP_S⎞
⎛ 2---------------------------------------⎝ Line Freq • 128 ⎠
CFDEN
CFNUM = ---------------------------------------------------------------- • 2
• 32768
ENERGY_W_L_RAW -⎞
⎛ --------------------------------------------------------⎝ LINE_CYC_NUM • 256⎠
Note:
Convert to 16-bit signed integer for compatibility with PIC18F2520 register
and firmware calculations.
The gain matching registers for the standard phase need to be set to the following
values when calibrating a standard phase:
EQUATION 5-5:
PHA_W_GAIN = 16, 384
The following equations apply for calculating the proper GLSB registers when
calibrating both a standard phase, and a non-standard phase. See flow chart for meter
input conditions.
DS51884A-page 38
© 2009 Microchip Technology Inc.
Meter Calibration
EQUATION 5-6:
PLSB = Value from Table 5-4 based on VB and IMAX values
EQUATION 5-7:
B • I B⎞
⎛V
---------------⎝ PLSB ⎠
PHA_W_GLSB = ------------------------------------------------------------- • 32768
PHA_W_RAW -⎞
⎛ -----------------------------------------------------⎝ 64 • LINE_CYC_NUM⎠
Note:
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations.
The calculation for PHA_VA_GLSB is identical except that it uses the PHA_VA_RAW
register instead of PHA_W_RAW:
EQUATION 5-8:
V B • I B⎞
⎛ ---------------⎝ PLSB ⎠
PHA_VA_GLSB = ------------------------------------------------------------- • 32768
PHA_VA_RAW -⎞
⎛ -----------------------------------------------------⎝ 64 • LINE_CYC_NUM⎠
Note:
© 2009 Microchip Technology Inc.
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations.
DS51884A-page 39
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.3.4
Configuration C2 Flow Chart - Phase Delay
Set MODE1 register bits
and LINE_CYC register
Put meter in Calibration
Configuration C2
(VB and IB at PF=0.5)
Enable Calibration Mode
by setting bit 0 and 1 of
CAL_CONTROL reg to 1
Is
CAL_MODE
bit 1 low?
NO
YES
Read contents of
PHA_W_RAW register
Read contents of
STAND_W_RAW
register
Calculate & Write
PHA_DELAY calibration
register contents based
on equations in
Section 5.3.5
End This
Phase
FIGURE 5-4:
DS51884A-page 40
Configuration C2 Flow Chart. - Phase Delay.
© 2009 Microchip Technology Inc.
Meter Calibration
5.3.5
Configuration C2 Equations - Phase Delay
For active power the following equations apply for calculating the time shift delay for a
given phase.
EQUATION 5-9:
W1 = PHA_W_RAW @ PF = 1, Configuration C1
EQUATION 5-10:
W2 = PHA_W_RAW @ PF = 0.5, Configuration C2
EQUATION 5-11:
LINE_CYC_NUM_1 = LINE_CYC_NUM @ PF = 1, Configuration C1
EQUATION 5-12:
LINE_CYC_NUM_2 = LINE_CYC_NUM @ PF = 0.5, Configuration C2
EQUATION 5-13:
180
– 1 W2 ⁄ LINE_CYC_NUM2
COS ⎛⎝ -----------------------------------------------------------⎞⎠ × --------- – 60
W1 ⁄ LINE_CYC_NUM1
PI
PHA_DELAY = ------------------------------------------------------------------------------------------------------------------- • 128
2.8125
Note 1:
2:
© 2009 Microchip Technology Inc.
Convert to 8-bit signed integer for compatibility with PIC18F2520 register
and firmware calculations.
Since 60 degrees (default) is being subtracted from the measured
quantity, the current should lag the voltage under configuration C2.
DS51884A-page 41
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.3.6
Configuration C3 Flow Chart - Offset
Set MODE1 register bits
LINE_CYC register
(suggest 256 Line Cycles)
Put meter in Calibration
Configuration C3
(VB and 1/100 IB at PF=1)
Enable Calibration Mode
by setting bit 0 and 1 of
CAL_CONTROL register
to 1
Is
CAL_MODE
bit 1 low
?
NO
YES
Read contents of
ENERGY_W_L_RAW
Register
Calculate & Write
PHA_W_OFF register
contents based on
equations in
Section 5.3.7
End of This
Phase
FIGURE 5-5:
DS51884A-page 42
Configuration C3 Flow Chart - Active Power Offset .
© 2009 Microchip Technology Inc.
Meter Calibration
5.3.7
Configuration C3 Equations - PA Offset
For active power offset, the following equations apply for a given phase. W1
corresponds to the PHA_W_RAW register obtained during configuration C1.
LINE_CYC_W1 corresponds to the LINE_CYC during this measurement.
W2 corresponds to the PHA_W_RAW register obtained during configuration C3.
LINE_CYC_W2 is the LINE_CYC during this measurement.
EQUATION 5-14:
W1 = PHA_W_RAW @ I B, Configuration C1
EQUATION 5-15:
W2 = PHA_W_RAW @ 1/100 I B , Configuration C3
EQUATION 5-16:
LINE_CYC_NUM_1 = LINE_CYC_NUM in Configuration C1
EQUATION 5-17:
LINE_CYC_NUM_2 = LINE_CYC_NUM in Configuration C3
EQUATION 5-18:
W1 ⁄ 100
W2
PHA_W_OFF = ------------------------------------------------------ – -----------------------------------------------------LINE_CYC_NUM_W1
LINE_CYC_NUM_W2
Note:
Convert to 32-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
The PHA_W_OFF registers hold a signed 32-bit value. However, the math in the
microcontroller could overflow for some values near the limits. Limit check the resulting
value to make sure the value is between -2,130,706,432 and 2,130,706,431 (inclusive).
Values less than -2,130,706,432 should be set to -2,130,706,432 while values greater
than 2,130,706,431 should be set to 2,130,706,431. If the value is limited, the user
should be aware that the meter could not completely correct the offset.
It is expected that this value will always be negative. If the value is positive, it may
indicate that the user has not provided a large enough number of line cycles for
configuration C4 (where the number of line cycles should be set to a larger value such
as 64 or 128). This may also be true if offset does not contribute a large enough
percentage to W2 (for example, 10% to 50% or more).
© 2009 Microchip Technology Inc.
DS51884A-page 43
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
5.3.8
Configuration C4 Flow Chart - Mid-Range
Set MODE1 register bits
and LINE_CYC register
Put meter in Calibration
Configuration C4
(VB and 1/10 IB at PF=1)
Is
CAL_MODE
bit 1 low?
NO
YES
Read contents of
PhA_I_RMS_RAW2 and
PhA_V_RMS_RAW2
registers (referred to as
IR2 and VR2 in equation
set)
Fetch values from
Calibration
Configuration C1
Calculate & Write
PHA_I_RMS_OFF,
PHA_V_RMS_OFF,
PHA_I_RMS_GLSB,
PHA_V_RMS_GLSB,
calibration register
contents based
equations in
Section 5.3.9
End of This
Phase
FIGURE 5-6:
DS51884A-page 44
Flow Chart for RMS Calibration.
© 2009 Microchip Technology Inc.
Meter Calibration
5.3.9
Equations for RMS Calibration
The following equations represent the proper method for calculating the calibration and
correction factors for the RMS current and RMS voltage. The PC calibration software
handles these calculations automatically.
Typically, the VMIN and IMIN voltages and currents will be 1/10 of the VB and IB values.
For RMS Offset, the following equations apply:
EQUATION 5-19:
IR1 = PHA_I_RMS_RAW2 @ I B , Configuration C1
EQUATION 5-20:
VR1 = PHA_V_RMS_RAW2 @ I B , Configuration C1
EQUATION 5-21:
IR2 = PHA_I_RMS_RAW2 @ I B , Configuration C4
EQUATION 5-22:
VR2 = PHA_V_RMS_RAW2 @ I B , Configuration C4
EQUATION 5-23:
I B @ C1
I G = -------------------I B @ C4
EQUATION 5-24:
V B @ C1
V G = ---------------------V B @ C4
EQUATION 5-25:
IR1 – IR2-⎞
⎛ --------------------------– IR 2
⎝ IG • IG – 1⎠
PHA_I_RMS_OFF = -----------------------------------------------65536
Note:
© 2009 Microchip Technology Inc.
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
DS51884A-page 45
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
EQUATION 5-26:
VR1 – VR2-⎞
⎛ -----------------------------– VR 2
⎝ VG • VG – 1⎠
PHA_V_RMS_OFF = ----------------------------------------------------65536
Note:
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
For RMS LSB correction, the following equations apply:
EQUATION 5-27:
ILSB = Value from Table 5-3 based on IMAX value
EQUATION 5-28:
VLSB = Value from Table 5-5 based on VB value
EQUATION 5-29:
IB ⎞
⎛ -----------⎝ ILSB⎠
PHA_I_RMS_GLSB = ------------------------------------------------------------------------ • 32768
IR 1
-------------- + PHA_I_RMS_OFF
65536
Note:
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
EQUATION 5-30:
VB ⎞
⎛ ------------⎝ VLSB⎠
PHA_V_RMS_GLSB = -------------------------------------------------------------------------- • 32768
VR 1
-------------- + PHA_V_RMS_OFF
65536
Note:
DS51884A-page 46
Convert to 16-bit signed integer for compatibility with PIC18F85J90 register
and firmware calculations
© 2009 Microchip Technology Inc.
Meter Calibration
TABLE 5-3:
CURRENT RESOLUTION TABLE
Maximum Current Less than or Equal To
(A)
8.1
81
810
8,100
TABLE 5-4:
LSB Resolution
(A)
0.001
0.01
0.1
1
POWER RESOLUTION TABLE
Maximum Wattage Less than or Equal To
(W - IMAX times VCAL)
125
1,250
12,500
125,000
1,250,000
12,500,000
TABLE 5-5:
LSB Resolution
(mW)
0.001
0.01
0.1
1
10
100
VOLTAGE RESOLUTION TABLE
Maximum Voltage Less than or Equal To
(V)
ALL
LSB Resolution
(V)
0.1
Note that the decimal point location in the reading frame is updated whenever the VCAL,
ICAL, or IMAX values are changed.
© 2009 Microchip Technology Inc.
DS51884A-page 47
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
NOTES:
DS51884A-page 48
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts of the
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design:
•
•
•
•
•
•
•
Board Schematic - Page 1
Board Schematic - Page 2
Board Schematic - Page 3
Board - Top Layer and Silk-screen
Board - Top Copper
Board - Bottom Layer and Silk-screen
Board - Bottom Copper
© 2009 Microchip Technology Inc.
DS51884A-page 49
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
BOARD SCHEMATIC - PAGE 1
M
A.2
DS51884A-page 50
© 2009 Microchip Technology Inc.
Schematic and Layouts
BOARD SCHEMATIC - PAGE 2
M
A.3
© 2009 Microchip Technology Inc.
DS51884A-page 51
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
BOARD SCHEMATIC - PAGE 3
M
A.4
DS51884A-page 52
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.5
BOARD - TOP LAYER AND SILK-SCREEN
DANGER
HIGH VOLTAGE
MCP3909 / PIC18F85J90 SHUNT METER
© 2009 Microchip Technology Inc.
DS51884A-page 53
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
A.6
BOARD - TOP COPPER
DS51884A-page 54
© 2009 Microchip Technology Inc.
Schematic and Layouts
A.7
BOARD - BOTTOM LAYER AND SILK-SCREEN
DANGER
HIGH VOLTAGE
© 2009 Microchip Technology Inc.
DS51884A-page 55
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
A.8
BOARD - BOTTOM COPPER
DS51884A-page 56
© 2009 Microchip Technology Inc.
MCP3909/PIC18F85J90 SINGLE PHASE
ENERGY METER REFERENCE DESIGN
Appendix B. Bill of Materials
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
Murata Electronics®
GRM188R71E104KA01D
CAP 1.0UF 630V METAL POLYPRO
EPCOS
B32614A6105J008
CAP CER 10UF 6.3V X5R 0603
Murata Electronics
GRM188R60J106ME47D
C10
CAP 470UF 25V ELECT FC SMD
Panasonic® - ECG
EEE-FC1E471P
5
C11, C13, C14
C16, C17
CAP CER 47000PF 25V 10% X7R 0603
Murata Electronics
GRM188R71E473KA01D
2
C15, C20
CAP CER 18PF 50V 5% C0G 0603
Murata Electronics
GRM1885C1H180JA01D
4
C26, C28, C31,
C35
CAP CER 6800PF 50V 5% C0G 1206
Murata Electronics
GRM3195C1H682JA01D
1
D1
IRED 940NM TOP MNT SMD
Sharp®
Microelectronics
GL100MN0MP
2
D2, D3
LED 1.6X0.8MM 625NM RED CLR SMD
Kingbright Corporation
APT1608EC
1
D4
DIODE ZENER 600W 15V 40A SMA
ON Semiconductor®
BZG03C15G
2
D5, D6
DIODE STD REC 1A 600V SMA
ON Semiconductor
MRA4005T3G
2
L1, L2
Chip Ferrite Beads / EMI Filters 150ohms
100MHz .3A Monolithic 1806 SMD
Steward
LI1806C151R-10
3
L3, L4, L5
Chip Ferrite Beads / EMI Filters 150ohms
100MHz .8A Monolithic 0805 SMD
Steward
LI0805H151R-10
1
LCD
LCD Glass size 65.00 x 18.00
Xiamen Ocular
Optics Co., Ltd.
DP076P
D09S24A4GV00LF
22
C1, C2, C3, C5, CAP CER .1UF 25V 10% X7R 0603
C6, C7, C9, C12,
C18, C21, C22,
C23, C24, C25,
C27, C29, C30,
C32, C33, C34,
C36, C37
1
C4
2
C8, C19
1
1
J1
CONN DSUB RCPT 9POS STR PCB SLD
FCI
1
J2
CONN POWERJACK MINI R/A T/H
Switchcraft®
RAPC722X
2
J3, J4
DO NOT INSTALL
—
—
1
MOV1
VARISTOR 275V RMS 20MM RADIAL
EPCOS
1
P1
6 X 1 Header 2.54mm on center 6 mm/2.5mm Samtec
1
PCB
RoHS Compliant Bare PCB,
MCP3909/PIC18F85J90 Single Phase Energy
Meter Reference Design
Microchip Technology
Inc.
104-000130
10
R1-R10
RES 0.0 OHM 1/8W 5% 0805 SMD
Rohm Co., Ltd
MCR10EZHJ000
3
R11, R12, R13
RES 4.70K OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX4701
3
R14, R15, R16
RES 1.00K OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX1001
3
R17, R21, R36
RES 698 OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX6980
1
R18
RES 470 OHM 1W 5% 2512 SMD
Panasonic - ECG
ERJ-1TYJ471U
2
R19, R20
RES 100 OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX1000
1
R22
DO NOT INSTALL
—
—
1
R23
RES 10.0K OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX1002
Note 1:
S20K275E2
TSW-106-07-G-S
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
used in manufacturing uses all RoHS-compliant components.
© 2009 Microchip Technology Inc.
DS51884A-page 57
MCP3909/PIC18F85J90 Single Phase Energy Meter Reference Design
TABLE B-1:
Qty
2
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Manufacturer
Part Number
Vishay®
1206 Precision Thin Film Chip Resistors
1/4watt 332Kohms .1% 25ppm
Intertechnology Inc.
R37, R38
RES 1.00K OHM 1/8W 1% 0805 SMD
Rohm Co., Ltd
2
R40, R43
RES 10.0 OHM 1/10W 1% 0603 SMD
Rohm Co., Ltd
MCR03EZPFX10R0
2
R41, R42
RES 1.0K OHM .1% 1/4W 0805 SMD
Susumu Co Ltd
RGH2012-2E-P-102-B
2
R24, R25
Description
TNPW1206332KBETY
MCR10EZHF1001
3
SW1, SW2, SW3 SWITCH TACT 6MM 230GF H=4.3MM
Omron Electronics
B3S-1002P
1
TP1
Wire Test Point 0.3" Length
Component
Corporation®
PJ-202-30
1
U1
Sensors 3V 38 kHz Surface Mount
Sharp Microelectronics
GP1US301XP
1
U2
Energy Metering IC with SPI Interface and
Active Power Pulse
Microchip Technology
Inc.
MCP3909T-I/SS
1
U3
SPI Serial EEPROM Family
Microchip Technology
Inc.
25LC256-I/SN
2
U4, U7
PHOTOCOUPLER DARL OUT 4-SMD
Sharp Microelectronics
PC365NJ0000F
1
U5
n IC 3.3V 100MA LDO REG SOT-23-5
Texas Instruments Inc.
TPS79133DBVR
1
U6
IC REG LDO 800MA 5.0V SOT-223
National
Semiconductor
LM1117MP-5.0/NOPB
1
U8
PIC18F Microcontroller with 32K bytes of
Flash, 2048 bytes of RAM
Microchip Technology
inc.
PIC18F85J90-I/PT
1
U9
MCP130 is a voltage supervisory device
Microchip Technology
Inc.
MCP130T-270I/TT
1
U10
±15kV ESD-Protected, RS-232 Transceivers
Maxim
MAX3323EEUE+
1
X1
CRYSTAL 10.0000MHZ 10PF SMD
Abracon™ Corporation
ABM3B-10.000MHZ-10-1-U-T
Note 1:
The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
used in manufacturing uses all RoHS-compliant components.
DS51884A-page 58
© 2009 Microchip Technology Inc.
Bill of Materials
NOTES:
© 2009 Microchip Technology Inc.
DS51884A-page 59
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Harbour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-3090-4444
Fax: 91-80-3090-4080
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Duluth, GA
Tel: 678-957-9614
Fax: 678-957-1455
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Cleveland
Independence, OH
Tel: 216-447-0464
Fax: 216-447-0643
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
Los Angeles
Mission Viejo, CA
Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Hsin Chu
Tel: 886-3-6578-300
Fax: 886-3-6578-370
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Xian
Tel: 86-29-8833-7252
Fax: 86-29-8833-7256
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
03/26/09
DS51884A-page 60
© 2009 Microchip Technology Inc.