MCP3901 and PIC18F65J90
Energy Meter Reference Design
User’s Guide
© 2012 Microchip Technology Inc.
DS51968A
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ISBN: 978-1-61341-960-1
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DS51968A-page 2
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Table of Contents
Preface ........................................................................................................................... 7
Introduction............................................................................................................ 7
Document Layout .................................................................................................. 8
Conventions Used in this Guide ............................................................................ 9
Recommended Reading...................................................................................... 10
The Microchip Web Site ...................................................................................... 10
Customer Support ............................................................................................... 10
Document Revision History ................................................................................. 10
Chapter 1. Product Overview
1.1 Introduction ................................................................................................... 11
1.2 What the MCP3901 and PIC18F65J90 Energy Meter
Reference Design Kit Includes ............................................................... 12
1.3 Getting Started ............................................................................................. 12
Chapter 2. Hardware
2.1 Overview ...................................................................................................... 13
2.2 Input and Analog Front End ......................................................................... 16
Chapter 3. Calculation Engine and Register Description
3.1 Calculation Engine Signal Flow Summary ................................................... 17
3.2 Register List ................................................................................................. 18
3.3 MODE ........................................................................................................... 19
3.4 STATUS ....................................................................................................... 20
3.5 CAL_CONTROL ........................................................................................... 20
3.6 LINE_CYC ................................................................................................... 21
3.7 LINE_CYC_CNT ......................................................................................... 21
3.8 RAW2_I_RMS .............................................................................................. 21
3.9 RAW_I_RMS ................................................................................................ 22
3.10 I_RMS ........................................................................................................ 22
3.11 RAW2_V_RMS ......................................................................................... 22
3.12 RAW_V_RMS ........................................................................................... 22
3.13 V_RMS ....................................................................................................... 22
3.14 LINE_FREQUENCY ................................................................................... 23
3.15 RAW_POWER_ACT ................................................................................. 23
3.16 POWER_ACT ............................................................................................. 23
3.17 POWER_APP ............................................................................................ 23
3.18 RAW_POWER_REACT ............................................................................. 24
3.19 POWER_REACT ........................................................................................ 24
© 2012 Microchip Technology Inc.
DS51968A-page 3
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.20 PERIOD ...................................................................................................... 24
3.21 ENERGY_ACT ........................................................................................... 24
3.22 ENERGY_APP .......................................................................................... 25
3.23 I_ABS_MAX ............................................................................................... 25
3.24 V_ABS_MAX .............................................................................................. 25
3.25 ENERGY_REACT ...................................................................................... 25
3.26 PHASE_COMPENSATION ........................................................................ 25
3.27 OFFSET_I_RMS ....................................................................................... 26
3.28 OFFSET_V_RMS ...................................................................................... 26
3.29 GAIN_I_RMS ............................................................................................. 26
3.30 GAIN_V_RMS ............................................................................................ 26
3.31 OFFSET_POWER_ACT .......................................................................... 26
3.32 GAIN_POWER_ACT .................................................................................. 27
3.33 OFFSET_POWER_REACT ...................................................................... 27
3.34 GAIN_POWER_REACT ............................................................................. 27
3.35 GAIN_ENERGY_ACT ................................................................................ 27
3.36 GAIN_ENERGY_APP ................................................................................ 27
3.37 GAIN_ENERGY_REACT ........................................................................... 27
3.38 CF_PULSE_WIDTH ................................................................................... 28
3.39 GAIN_DENR_ENERGY_ACT .................................................................... 28
3.40 GAIN_NUMR_ENERGY_ACT ................................................................... 28
3.41 MODE1_DEF ........................................................................................... 28
3.42 CAL_STATUS ............................................................................................ 28
3.43 MAXIMUM CURRENT ............................................................................. 29
3.44 CALIBRATION_VOLTAGE ...................................................................... 29
3.45 CALIBRATION_CURRENT ...................................................................... 29
3.46 CALIBRATION_FREQUENCY .................................................................. 29
3.47 METER_CONSTANT ................................................................................ 29
3.48 CALIBRATION_LINE_CYCLE .................................................................. 30
3.49 GAIN_DENR_ENERGY_REACT .............................................................. 30
3.50 GAIN_NUMR_ENERGY_REACT ............................................................. 30
3.51 PHASE_COMPENSATION_90 ................................................................. 30
3.52 CREEP_THRSHOLD_MINUTE ................................................................. 30
3.53 CREEP_THRSHOLD_SECOND ................................................................ 30
Chapter 4. Meter Protocol and Timings
4.1 Protocol ....................................................................................................... 31
Appendix A. Schematic and Layouts
A.1 Introduction .................................................................................................. 33
A.2 Schematics and PCB Layout ....................................................................... 33
A.3 Board – ADC Schematic ............................................................................. 34
A.4 Board – MCU Schematic ............................................................................ 35
A.5 Board – LCD and USB Schematic ............................................................... 36
A.6 Board – Top Silk and Pads ......................................................................... 37
A.7 Board – Top Copper .................................................................................... 38
DS51968A-page 4
© 2012 Microchip Technology Inc.
A.8 Board – Bottom Copper ............................................................................... 39
A.9 Board – Bottom Silk and Pads ..................................................................... 40
A.10 Board – Top 3D .......................................................................................... 41
A.11 Board – Bottom 3D .................................................................................... 42
Appendix B. Bill of Materials (BOM)
Worldwide Sales and Service .................................................................................... 46
© 2012 Microchip Technology Inc.
DS51968A-page 5
MCP3901 and PIC18F65J90 Energy Meter Reference Design
DS51968A-page 6
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
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 online 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
MCP3901 and PIC18F65J90 Energy Meter Reference Design User’s Guide. Items
discussed in this chapter include:
•
•
•
•
•
•
Document Layout
Conventions Used in this Guide
Recommended Reading
The Microchip Web Site
Customer Support
Document Revision History
© 2012 Microchip Technology Inc.
DS51968A-page 7
MCP3901 and PIC18F65J90 Energy Meter Reference Design
DOCUMENT LAYOUT
This document describes how to use the MCP3901 and PIC18F65J90 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 MCP3901
and PIC18F65J90 Energy Meter Reference Design including a Getting Started
section that describes wiring the line and load connections.
• Chapter 2. “Hardware” – Includes details on the function blocks of the meter
including the analog front end design, phase lock loop circuitry, 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 register’s detail.
• Chapter 4. “Meter Protocol and Timings”– This chapter describes the protocol
used for accessing the registers, including commands that are used to interface to
the meter.
• Appendix A. “Schematic and Layouts” – Shows the schematic and layout
diagrams.
• Appendix B. “Bill of Materials (BOM)” – Lists the parts used to build the
MCP3901 and PIC18F65J90 Energy Meter Reference Design.
DS51968A-page 8
© 2012 Microchip Technology Inc.
Preface
CONVENTIONS USED IN THIS GUIDE
This manual uses the following documentation conventions:
DOCUMENTATION CONVENTIONS
Description
Arial font:
Italic characters
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
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
Represents code supplied by
user
© 2012 Microchip Technology Inc.
Examples
File>Save
Press <Enter>, <F1>
#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}
var_name [,
var_name...]
void main (void)
{ ...
}
DS51968A-page 9
MCP3901 and PIC18F65J90 Energy Meter Reference Design
RECOMMENDED READING
This user's guide describes how to use the MCP3901 and PIC18F65J90 Energy Meter
Reference Design. Other useful documents are listed below. The following Microchip
documents are available and recommended as supplemental reference resources.
MCP3901 Data Sheet – “Two Channel Analog Front End” (DS22192)
This data sheet provides detailed information regarding the MCP3901 device.
AN994 – “IEC Compliant Active-Energy Meter Design Using the MCP3905A/06A”
(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://www.microchip.com/support.
DOCUMENT REVISION HISTORY
Revision A (January 2012)
• Initial Release of this Document.
DS51968A-page 10
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Chapter 1. Product Overview
1.1
INTRODUCTION
The MCP3901 and PIC18F65J90 Energy Meter Reference Design is a fully functional
IEC Class 0.5 compliant single-phase meter. This low-cost design does not use any
transformers and requires few external components. The PIC18F65J90 directly drives
the LCD, and includes both an isolated USB connection for meter calibration and
access to the device power calculations. The system calculates active energy, active
power, RMS current, RMS voltage, reactive energy, reactive power, apparent power
and other typical power quantities.
The Microchip Energy Meter 1-Phase Software is used to calibrate and monitor the
system, and can be used to create custom calibration setups. For some accuracy
requirements, only a single point calibration may be needed. The energy meter
software offers an automated step-by-step calibration process that can be used to
quickly calibrate energy meters.
FIGURE 1-1:
© 2012 Microchip Technology Inc.
MCP3901 and PIC18F65J90 Single-Phase Energy Meter.
DS51968A-page 11
MCP3901 and PIC18F65J90 Energy Meter Reference Design
1.2
WHAT THE MCP3901 AND PIC18F65J90 ENERGY METER REFERENCE
DESIGN KIT INCLUDES
This MCP3901 and PIC18F65J90 Energy Meter Reference Design kit includes:
• MCP3901 and PIC18F65J90 Energy Meter Reference Design User’s Guide
• Important Information Sheet
1.3
GETTING STARTED
To describe how to use the MCP3901 and PIC18F65J90 Energy Meter Reference
Design, the following example is given using a two-wire 1-phase, 220 VAC line voltage
and connections using 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 60A.
To test a calibrated meter, the following connections apply for a two-wire connection.
1.3.1
Step 1: Wiring Connections
Figure 1-2 identifies the line and load connections of the MCP3901 and PIC18F65J90
Energy Meter Reference Design.
1
2
3
4
Line
Line
Neutral
Neutral
MAIN
LOAD
FIGURE 1-2:
1.3.2
Example Connections using a 2-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 the total energy accumulated.
DS51968A-page 12
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Chapter 2. Hardware
2.1
OVERVIEW
Figures 2-1 and 2-2 show the MCP3901 and PIC18F65J90 and Energy Meter
Reference Design:
9
10
D9D8
1
U1
D1
D3
J4
J3
D2
P1
LCD1
SW3
8
2
7
3
C40
SW1
SW2
4
J2
DANGER
HIGH VOLTAGE
MCP3901 / PIC18F65J90 SHUNT METER
5
Legend:
6
1 = IR for meter communication
7
=
Push button Switches
2 = Test points
8
=
9-digit LCD Display with icons for kWh and kVARh
3 = MCP3901 Analog Front End
9
=
Pulse Output for Active and Reactive
(isolated)
4 = +9V DC Input (non-isolated)
10
=
USB Connection (isolated)
5 = Connections to shunt
current sensing resistor
6 = Connections to Line and Neutral
FIGURE 2-1:
Top View – Hardware Components.
© 2012 Microchip Technology Inc.
DS51968A-page 13
MCP3901 and PIC18F65J90 Energy Meter Reference Design
.
17
C40
X2
R27 R26
C24 C25
C7
R28
R29
U2
C32
C39
16
R33
C37
R19
R17
R21
R20
U7
U5
U4
R30
12
R34
U8
15
R32
DANGER
HIGH VOLTAGE
C41
C5
R14
R12
C2
Q1
C6
D6
C8
C9
C38
C10
R18
D5
14
R31
C23
C19
C17
C16
U6
U3
C30
C27
C21
C22
D7
R15
R11
C1
13
L2
L1
L3
R24 R25
C4
D4
MOV1
Legend:
FIGURE 2-2:
DS51968A-page 14
12
=
Opto-isolators for Pulse outputs
13
=
Power supply
14
=
Non-volatile memory for calibration constants and energy usage data
15
=
PIC18F65J90
16
=
Isolation IC
17
=
MCP2200 for USB connection
Bottom View – Hardware Components.
© 2012 Microchip Technology Inc.
Hardware
PIC18F65J90
RA2
RA3
RG1
SWITCH
RG4
SWITCH
Active
Power
RC7/RX
RC6/TX
USB to UART
Converter
MCP2200
Reactive
Power
Mini - USB Connector
(ISOLATED)
SCK
SDO
SDI
RA5
CS
MCP3901
AFE
RC4/SDI
SCK
SDO
RC5/SDO
SDI
RC3/SCK
RA1
CS
25LC256
SPI - EEPROM
FIGURE 2-3:
Digital Connections.
© 2012 Microchip Technology Inc.
DS51968A-page 15
MCP3901 and PIC18F65J90 Energy Meter Reference Design
2.2
INPUT AND ANALOG FRONT END
The MCP3901 and PIC18F65J90 and Energy Meter Reference Design 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 connections
that are made from the PCB to the meter casing. They are labeled LINE, NEUTRAL,
SHUNT1, and SHUNT2. The shunt sits on the high or line side of a two-wire system
and the meter employs 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 be twisted together, and also kept away from the
SHUNT1 and SHUNT2 wires if possible.
The neutral side of the two-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.
150 FB (Note)
1.0 kΩ
CH0+
LINE_SHUNT1
68 nF
Shunt
(external to
PCB part of
meter case)
150 FB (Note)
1.0 kΩ
CH0-
LINE_SHUNT2
68 nF
MCP3901
332 kΩ 332 kΩ
0Ω
NEUTRAL
CH1+
68 nF
1.0 kΩ
10-step optional
resistor
ladder
1.0 kΩ
CH1+
68 nF
Note:
FB = ferrite beads. Ferrite beads have an impedance of the
specified value at 100 MHz.
FIGURE 2-4:
DS51968A-page 16
Analog Input Circuitry.
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90 ENERGY
METER REFERENCE DESIGN
Chapter 3. Calculation Engine and Register Description
3.1
CALCULATION ENGINE SIGNAL FLOW SUMMARY
RMS voltage, RMS current, Active Power, Reactive Power and Apparent Power, and
the calibration output pulse are all calculated through the following process described
in Figure 3-1. The calibration registers for each calculation are shown as well as the
output registers.
OFFSET_I_RMS:16
16/24-bit ΔΣ ADC
Σ
X2
ADC
CURRENT
X
RMS Current
Apparent Power
Σ
X
Reactive Power
GAIN_
COMPENSATION
_90:8
90° with
Φ Correction
OFFSET_POWER_REACT:32
Σ
X
Active Power
16/24-bit DS ADC
Φ
ADC
PHASE_COMPENSATION:8
VOLTAGE
OFFSET_POWER_ACT:32
RMS Voltage
/
X
GAIN_ENERGY_APP:16
X
GAIN_ENERGY_ACT:16
X
GAIN_POWER_APP:16
X
GAIN_POWER_ACT:16
X
GAIN_I_RMS:16
X
GAIN_V_RMS:16
GAIN_ENERGY_REACT:16
X
X
kVAh
ENERGY_APP:32
kWh
ENERGY_ACT:32
kVA
POWER_APP:32
kW
POWER_ACT:32
A
I_RMS:16
V
V_RMS:16
POWER_REACT:32
ENERGY_REACT:32
kVAR
kVARh
Σ
imp/kVARh
imp/kWh
Σ
1/METER_CONSTAT
GAIN_POWER_REACT:16
Digital to
Frequency
Converter
GAIN_NUMR_ENERGY_REACT:16
1/METER_CONSTAT
GAIN_DENR_ENERGY_REACT:8
Digital to
Frequency
Converter
/
FIGURE 3-1:
Σ
X2
GAIN_NUMR_ENERGY_ACT:16
GAIN_DENR_ENERGY_ACT:8
OFFSET_V_RMS:16
PIC18F65J90 Calculation Engine Signal Flow
© 2012 Microchip Technology Inc.
DS51968A-page 17
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.2
REGISTER LIST
Note:
Important! Not all registers and features
are implemented in this version of
firmware release.
TABLE 3-1:
INTERNAL REGISTER SUMMARY
Name
Bits R/W
Description
MODE
8
STATUS
8
R/W Configuration register for operating mode of the meter
CAL_CONTROL
8
R/W Configuration register for calibration control
LINE_CYC
16
R/W 2n number of line cycles to be used during energy accumulation
R
STATUS register
LINE_CYC_CNT
16
R
Counter for number of line cycles
RAW2_I_RMS
64
R
Raw2 RMS value from the current A/D converter in LSBs
RAW_I_RMS
16
R
Raw RMS value from the current A/D converter in LSBs
I_RMS
16
R
RMS value of the current, post Calibration
RAW2_V_RMS
64
R
Raw2 RMS value from the voltage A/D converter in LSBs
RAW_V_RMS
16
R
Raw RMS value from the voltage A/D converter in LSBs
V_RMS
16
R
RMS value of the voltage, post Calibration
LINE_FREQUENCY
16
R
Line Frequency
RAW_POWER_ACT
64
R
Raw Active Power
POWER_ACT
32
R
Final Active Power, units in watts (W)
POWER_APP
32
R
Final Apparent Power, units in volt-amperes (VA)
RAW_POWER_REACT
64
R
Raw Reactive Power
POWER_REACT
32
R
Final Reactive Power, units in volt-amperes-reactive (VAR)
PERIOD
32
R
Period register
ENERGY_ACT
32
R
Final Active Energy accumulated
RAW_ENERGY_ACT
64
R
Raw Active Energy accumulated
ENERGY_APP
32
R
Final Apparent Energy accumulated
RAW_ENERGY_APP
64
R
Raw Apparent Energy accumulated
I_ABS_MAX
8
R
Not implemented
V_ABS_MAX
8
R
Not implemented
ENERGY_REACT
32
R
Final Reactive Energy accumulated
RAW_ENERGY_REACT
64
R
Final Reactive Energy accumulated
PHASE_COMPENSATION
OFFSET_I_RMS
8
16
R/W Phase compensation between voltage and current
R/W Offset adjustment for RMS current reading
OFFSET_V_RMS
16
R/W Offset adjustment for RMS voltage reading
GAIN_I_RMS
16
R/W Gain adjustment for RMS current
GAIN_V_RMS
16
R/W Gain adjustment for RMS voltage
OFFSET_POWER_ACT
32
R/W Active Power offset
GAIN_POWER_ACT
16
R/W Active Power gain adjust
OFFSET_POWER_REACT
32
R/W Offset correction for Reactive Power
GAIN_POWER_REACT
16
R/W Reactive Power gain adjust to produce X VAR/LSB
GAIN_ENERGY_ACT
16
R/W Not implemented
GAIN_ENERGY_APP
16
R/W Not implemented
GAIN_ENERGY_REACT
16
R/W Not implemented
CF_PULSE_WIDTH
8
R/W Defines CF pulse width from 0 to 255 x 0.8192 ms (0.209s)
GAIN_DENR_ENERGY_ACT
8
R/W Active Energy Pulse Output correction factor
DS51968A-page 18
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
TABLE 3-1:
INTERNAL REGISTER SUMMARY (CONTINUED)
Name
Bits R/W
Description
GAIN_NUMR_ENERGY_ACT
16
R/W Active Energy Pulse Output correction factor
MODE1_DEF
16
R/W Power Up Configuration Register
CAL_STATUS
16
R/W Calibration Status
MAXIMUM CURRENT
16
R/W Maximum current of the meter (IMAX)
CALIBRATION_VOLTAGE
16
R/W Calibration Voltage of the meter (VCAL)
CALIBRATION_CURRENT
16
R/W Calibration Current of the meter (ICAL)
CALIBRATION_FREQUENCY
16
R/W Calibration Frequency of the meter
METER_CONSTANT
16
R/W Meter Constant in imp/kWh or imp/kVARh
CALIBRATION_LINE_CYCLE
16
R/W Number of line cycles for calibration
GAIN_DENR_ENERGY_REACT
8
R/W Reactive Energy Pulse Output correction factor
GAIN_NUMR_ENERGY_REACT
16
R/W Reactive Energy Pulse Output correction factor
PHASE_COMPENSATION_90
8
R/W Phase delay for Reactive Power
CREEP_THRSHOLD_MINUTE
8
R/W No Load threshold time (minutes)
CREEP_THRSHOLD_SECOND
8
R/W No Load threshold time (seconds)
ENERGY_ACT
32
R/W Active Energy
ENERGY_REACT
32
R/W Reactive Energy
3.3
MODE
The MODE register controls the operation of the energy meter. The bit functions are
defined by the table below.
REGISTER 3-1:
MODE REGISTER
U-0
U-0
U-0
U-0
R/W-0
R/W-0
R/W-0
R/W-0
—
—
—
—
CF
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 7-4
Unimplemented: Read as ‘0’.
bit 3
CF: Active Energy CF Phase Enable bit
1 = Bit = 1 Phase is enabled to be accumulated into the total energy registers or CF pulse output
0 = Bit = 0 Phase is DISABLED and is not accumulated into the total energy registers or CF pulse
output
bit 2
ABSOLUTE Positive Only Energy Accumulation Mode bit
1 = Bit = 1 Positive energy only
0 = Bit = 0 Both negative and positive energy accumulated (negative energy is subtracted)
bit 1
PHASE: Phase bit
1 = Single-Point Phase Correction
0 = Multi-Point Phase Correction (future)
bit 0
CREEP: No-Load Threshold bit
1 = Enabled
0 = Disabled
© 2012 Microchip Technology Inc.
DS51968A-page 19
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.4
STATUS
The STATUS register contains the operational status of the energy meter. The bit
functions are defined in the table below.
REGISTER 3-2:
STATUS REGISTER
U-0
U-0
U-0
U-0
U-0
U-0
R
U-0
—
—
—
—
—
—
PH_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
bit 7-2
Unimplemented: Read as ‘0’
bit 1
PH_S: Phase Sign bit
1 = CT may be in backward (if enabled)
0 = Operation normal
bit 0
Unimplemented: Read as ‘0’
3.5
x = Bit is unknown
CAL_CONTROL
This is the Calibration mode control register. Bit 0 enables the Calibration mode. In this
mode, the power meter operates as normal, but no updates are made to the voltage,
current, power or energy registers as long as bit 1 is low. When bit 1 is set high, the
registers are updated for LINE_CYC line cycles (only power and energy registers are
updated). After this time, bit 1 is set low by the PIC18F65J90 and the update of the
registers will stop. This allows the calibration software to set bit 0, clear the registers,
set bit 1 and start reading the desired registers, as well as the CAL_CONTROL register,
to check the status of bit 1. When bit 1 goes low, the LINE_CYC line cycles have
passed and the 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 registers will be ready
to read.
REGISTER 3-3:
CAL_CONTROL REGISTER (NOTE 1)
U-0
U-0
U-0
U-0
U-0
U-0
—
—
—
—
—
Reserved
R/W-0
R/W-0
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
bit 7-3
Unimplemented: Read as ‘0’
bit 2
Reserved:
DS51968A-page 20
x = Bit is unknown
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
REGISTER 3-3:
CAL_CONTROL REGISTER (CONTINUED)(NOTE 1)
bit 1
CAL_UPDATE: Calibration Update bit
Power and energy registers updated for LINE_CYC line cycles when cleared. Bit must be set for registers to begin updating, which starts on the next line cycle after bit is set.
1 = When the CAL_MODE bit is set, set the CAL_UPDATE bit to enable update of power and energy
registers starting on next line cycle. Bit = 1 Single Point Phase Correction.
0 = When the CAL_MODE bit is set and the CAL_UPDATE bit has been set, the CAL_UPDATE 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 the CAL_UPDATE bit is set again, or the 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
Note 1:
3.6
This register is used in Multi-Point and Single-Point Calibration modes only.
LINE_CYC
Name
LINE_CYC
Bits
Cof
16
R/W
Number of line cycles as a power of two. A setting of 0 indicates 20 or one line cycle.
A setting of 1 is two line cycles (21), a setting of 2 is four lines cycles (22), up to a setting
of eight which is 256 line cycles. When written, this register will not take effect until the
previous number of line cycles has been acquired.
3.7
LINE_CYC_CNT
Name
Bits
Cof
LINE_CYC_CNT
16
R
This register counts from 0 and finishes at 2 (LINE_CYC - 1). Then it restarts at 0, where
LINE_CYC represents the value in the LINE_CYC register.
3.8
RAW2_I_RMS
Name
RAW2_I_RMS
Bits
Cof
64
R
This register is the square of the raw RMS value from the current A/D converter in
LSBs. By definition, this register will always contain a positive value, including the situation where power is negative from a backwards CT or otherwise. This register is
overwritten every LINE_CYC line cycle and is written only once, if calibration is
enabled.
© 2012 Microchip Technology Inc.
DS51968A-page 21
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.9
RAW_I_RMS
Name
RAW_I_RMS
Bits
Cof
16
R
This register is the raw RMS value from the current A/D converter in LSBs (square root
of the top 32-bits of RAW2_I_RMS + OFFSET_I_RMS). By definition, this register will
always contain a positive value (even if the CT is in backwards). This register is overwritten every LINE_CYC line cycle and is written only once, if calibration is enabled.
3.10
I_RMS
Name
I_RMS
Bits
Cof
16
R
This register is the RMS value of phase A current in X A/LSB, as determined by the
value in the GAIN_I_RMS register. When displaying the RMS current, multiply the (decimal) value in these registers by X to get the display value in amperes. This register is
overwritten every LINE_CYC line cycle (written only once if calibration is enabled).
3.11
RAW2_V_RMS
Name
RAW2_V_RMS
Bits
Cof
64
R
This register is the square of the raw RMS value from the voltage A/D converter in
LSBs. By definition, it will always contain a positive value. This register is overwritten
every LINE_CYC line cycle (written only once if calibration is enabled).
3.12
RAW_V_RMS
Name
RAW_V_RMS
Bits
Cof
16
R
This is the raw RMS value from the voltage A/D converter in LSBs (square root of the
top 32-bits of RAW2_V_RMS + OFFSET_V_RMS). By definition, this register will
always contain a positive value. The register is overwritten every LINE_CYC line cycle
(written only once if calibration is enabled).
3.13
V_RMS
Name
V_RMS
Bits
Cof
16
R
This register is the RMS value of the voltage, in X 0.01 V/LSB, as determined by the
value in the GAIN_V_RMS register. When displaying the RMS voltage, assume a calibrated meter exists and multiply the (decimal) value in these registers by X to get the
display value in volts. This register is overwritten every LINE_CYC line cycle (written
only once if calibration is enabled).
DS51968A-page 22
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
3.14
LINE_FREQUENCY
Name
Bits
Cof
LINE_FREQUENCY
16
R
This register holds the measured line frequency using the zero crossing technique.
3.15
RAW_POWER_ACT
Name
Bits
Cof
RAW_POWER_ACT
64
R
This register is the raw active power, as it represents the sum of current A/D value times
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,
48 bits are needed. This is the register to be read during calibration for calculating the
offset and gain values associated with active power, OFFSET_POWER_ACT and
GAIN_POWER_ACT. This register is overwritten every line cycle, however if calibration
is enabled, the updates will stop once the LINE_CYC line cycles have elapsed.
3.16
POWER_ACT
Name
Bits
Cof
POWER_ACT
32
R
This register is the value for active power. The goal of the calibration is to get this register value to equal X W/LSB. This is done with the OFFSET_POWER_ACT and
GAIN_POWER_ACT registers. When displaying the power, multiply the (decimal)
value in this register by X to get the display value in watts. This register is overwritten
every LINE_CYC line cycle (written only once if calibration is enabled).
3.17
POWER_APP
Name
Bits
Cof
POWER_APP
32
R
This is the value of the apparent power. The goal of the calibration is to get this value
to equal X VA/LSB. This is done with the GAIN_POWER_APP registers. When displaying the power for phase A, multiply the (decimal) value in this register by X to get the
display value in watts. This register is overwritten every LINE_CYC line cycle (written
only once if calibration is enabled).
© 2012 Microchip Technology Inc.
DS51968A-page 23
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.18
RAW_POWER_REACT
Name
Bits
Cof
RAW_POWER_REACT
64
R
This is the raw reactive power. This register is read during the calibration for calculating
the gain values associated with the reactive power and GAIN_POWER_REACT. This
register is overwritten every LINE_CYC line cycle (written only once if calibration is
enabled). This register is accumulated on a line-cycle basis.
3.19
POWER_REACT
Name
POWER_REACT
Bits
Cof
32
R
This is the value for reactive power. The goal is to get this value to equal X VAR/LSB.
This is done with the GAIN_POWER_REACT register. When displaying the power,
multiply the (decimal) value in this register by X to get the display value in watts. This
register is overwritten every LINE_CYC line cycle (written only once if calibration is
enabled).
3.20
PERIOD
Name
PERIOD
Bits
Cof
32
R
This 32-bit register represents the total number of clock ticks that elapsed over the most
recent LINE_CYC line cycle. Each LSB represents 1.6 µs with a 4 MHz clock on the
microcontroller. This register is overwritten every LINE_CYC line cycle (written only
once if calibration is enabled).
3.21
ENERGY_ACT
Bits
Cof
ENERGY_ACT
Name
32
R
RAW_ENERGY_ACT
64
R
The design updates the Energy register using the CF Pulse blink output count. In this
method, the Energy registers increments every pulse by a value equal to
1/(METER_CONSTANT).
ENERGY_ACT = ENERGY_ACT + (1/METER_CONSTANT)
The gain calibration registers GAIN_NUMR_ENERGY_ACT and
GAIN_DENR_ENERGY_ACT operate the same for this method also.
DS51968A-page 24
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
3.22
ENERGY_APP
Bits
Cof
ENERGY_APP
Name
32
R
RAW_ENERGY_APP
64
R
These two registers represent the total apparent energy accumulated so far.
3.23
I_ABS_MAX
Name
I_ABS_MAX
Bits
Cof
8
R
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.24
V_ABS_MAX
Name
V_ABS_MAX
Bits
Cof
8
R/W
NOT IMPLEMENTED IN THIS FIRMWARE/SOFTWARE RELEASE.
3.25
ENERGY_REACT
Bits
Cof
ENERGY_REACT
Name
32
R
RAW_ENERGY_REACT
64
R
The design updates the reactive energy register using the CF Pulse blink output. In this
method, the Energy registers increment every pulse by a value equal to
1/(METER_CONSTANT).
ENERGY_REACT = ENERGY_REACT + (1/METER_CONSTANT)
The gain calibration registers GAIN_NUMR_ENERGY_ACT and
GAIN_DENR_ENERGY_ACT operate the same for this method also.
3.26
PHASE_COMPENSATION
Name
Bits
Cof
PHASE_COMPENSATION
8
R/W
Phase delay, signed 8-bit value, provides the phase compensation by sampling time/2.
© 2012 Microchip Technology Inc.
DS51968A-page 25
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.27
OFFSET_I_RMS
Name
Bits
Cof
16
R/W
OFFSET_I_RMS
Square of the offset for RMS current reading, signed 16-bit value. Note that this value
should be similar to the ADC’s noise squared. At a gain of 1, the noise will be about
1 LSB, 2 LSBs at a gain of 2, 6 LSBs at a gain of 8, 11 LSBs at a gain of 16, and
22 LSBs at a gain of 32. There may be other sources of noise. Using the square of the
offset allows for higher accuracy. The value will be added before the square root is
taken when calculating the final RMS value.
3.28
OFFSET_V_RMS
Name
Bits
Cof
16
R/W
OFFSET_V_RMS
Square of offset for RMS voltage reading, signed 8-bit value. Note that this value
should be similar to the ADC’s noise squared. For the voltage channel, the noise will
be about 1 LSB. There may be other sources of noise. Using the square of the offset
allows for higher accuracy. The value will be added before the square root is taken
when calculating the final RMS value.
3.29
GAIN_I_RMS
Name
Bits
Cof
GAIN_I_RMS
16
R/W
Current gain to produce X A/LSB. The value is always less than one (for example,
32,767 = 0.9999695).
3.30
GAIN_V_RMS
Name
Bits
Cof
GAIN_V_RMS
16
R/W
Voltage gain to produce 0.1 V/LSB in the V_RMS register. The value is always less than
one (for example, 32,767 = 0.9999695).
3.31
OFFSET_POWER_ACT
Name
Bits
Cof
OFFSET_POWER_ACT
32
R/W
Active power offset (this is a straight offset, not the square, as with voltage and current).
A much larger value is needed because the power is a running sum. This is a 32-bit
signed value.
DS51968A-page 26
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
3.32
GAIN_POWER_ACT
Name
Bits
Cof
GAIN_POWER_ACT
16
R/W
Active power gain to produce X W/LSB. The value is always less than one (for example,
32,767 = 0.9999695).
3.33
OFFSET_POWER_REACT
Name
Bits
Cof
OFFSET_POWER_REACT
32
R/W
Reactive power offset (this is a straight offset, not the square, as with voltage and current). A much larger value is needed because the power is a running sum. This is a
32-bit signed value.
3.34
GAIN_POWER_REACT
Name
Bits
Cof
GAIN_POWER_REACT
16
R/W
Reactive power gain to produce X W/LSB. The value is always less than one (for example, 32,767 = 0.9999695).
3.35
GAIN_ENERGY_ACT
Name
Bits
Cof
GAIN_ENERGY_ACT
16
R/W
Active energy gain to produce X Wh/LSB. The value is always less than one (for example, 32,767 = 0.9999695).
3.36
GAIN_ENERGY_APP
Name
Bits
Cof
GAIN_ENERGY_APP
16
R/W
Apparent energy gain to produce X VAh/LSB. The value is always less than one (for
example, 32,767 = 0.9999695).
3.37
GAIN_ENERGY_REACT
Name
Bits
Cof
GAIN_ENERGY_REACT
16
R/W
Reactive energy gain to produce X VARh/LSB. The value is always less than one (for
example, 32,767 = 0.9999695).
© 2012 Microchip Technology Inc.
DS51968A-page 27
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.38
CF_PULSE_WIDTH
Name
Bits
Cof
CF_PULSE_WIDTH
8
R/W
Defines the CF pulse width from 0 to 255. Length of width is valued
* 8 * (1/LINE_FREQUENCY)/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.
3.39
GAIN_DENR_ENERGY_ACT
Name
Bits
Cof
GAIN_DENR_ENERGY_ACT
8
R/W
8-bit signed value. Represents the number of shifts for active power energy register
ENERGY_ACT before GAIN_DENR_ENERGY_ACT is applied.
3.40
GAIN_NUMR_ENERGY_ACT
Name
Bits
Cof
GAIN_NUMR_ENERGY_ACT
16
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).
3.41
MODE1_DEF
Name
MODE1_DEF
Bits
Cof
16
R/W
MODE default power-up settings. On power-up, this register will be read and placed
into the MODE register.
3.42
CAL_STATUS
The CAL_STATUS register 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.
REGISTER 3-4:
R/W-0
CAL_STATUS REGISTER
R/W-0
PHASE_COM OFFSET_I_
PENSATION
RMS
R/W-0
U-0
U-0
OFFSET_V_
RMS
—
—
R/W-0
R/W-0
R/W-0
GAIN_I_RMS GAIN_V_RMS OFFSET_PO
WER_ACT
bit 15
bit 8
U-0
R/W-0
U-0
U-0
U-0
R/W-0
U-0
U-0
—
GAIN_POW
ER_ACT
—
—
—
GAIN_POWE
R_REACT
—
—
bit 7
DS51968A-page 28
bit 0
© 2012 Microchip Technology Inc.
Calculation Engine and Register Description
REGISTER 3-4:
CAL_STATUS REGISTER (CONTINUED)
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
bit 15-0
3.43
x = Bit is unknown
All bits: Calibration Register Status bits
1 = This register has been calibrated
0 = This register is NOT calibrated
MAXIMUM CURRENT
Name
MAXIMUM_CURRENT
Bits
Cof
16
R/W
This register holds the maximum current for the meter (IMAX).
3.44
CALIBRATION_VOLTAGE
Name
Bits
Cof
CALIBRATION_VOLTAGE
16
R/W
This register holds the calibration voltage of the meter (VCAL).
3.45
CALIBRATION_CURRENT
Name
Bits
Cof
CALIBRATION_CURRENT
16
R/W
This register holds the calibration current of the meter (ICAL).
3.46
CALIBRATION_FREQUENCY
Name
Bits
Cof
CALIBRATION_FREQUENCY
16
R/W
This register holds the calibration frequency of the meter.
3.47
METER_CONSTANT
Name
METER_CONSTANT
Bits
Cof
16
R/W
This register holds the meter constant in imp/kWh or imp/kVARh.
© 2012 Microchip Technology Inc.
DS51968A-page 29
MCP3901 and PIC18F65J90 Energy Meter Reference Design
3.48
CALIBRATION_LINE_CYCLE
Name
Bits
Cof
CALIBRATION_FREQUENCY
16
R/W
This register holds the number of line cycles used during the calibration.
3.49
GAIN_DENR_ENERGY_REACT
Name
Bits
Cof
GAIN_DENR_ENERGY_REACT
8
R/W
8-bit signed value. Represents the number of shifts for reactive power energy register,
before GAIN_NUMR_ENERGY_REACT is applied.
3.50
GAIN_NUMR_ENERGY_REACT
Name
Bits
Cof
GAIN_NUMR_ENERGY_REACT
16
R/W
Reactive power gain to produce a specified pulse per VAR-hour. The value is always
less than one (for example, 32,767 = 0.9999695).
3.51
PHASE_COMPENSATION_90
Name
Bits
Cof
PHASE_COMPENSATION_90
8
R/W
Phase delay for reactive power, signed 8-bit value, sampling time/2.
3.52
CREEP_THRSHOLD_MINUTE
Name
Bits
Cof
CREEP_THRSHOLD_MINUTE
8
R/W
This 8-bit register holds the decimal representation of the creep threshold time in
minutes (total creep is minutes + seconds register).
3.53
CREEP_THRSHOLD_SECOND
Name
Bits
Cof
CREEP_THRSHOLD_SECOND
8
R/W
This 8-bit register holds the decimal representation of the creep threshold time in
seconds (total creep is minutes + seconds register).
DS51968A-page 30
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Chapter 4. Meter Protocol and Timings
4.1
PROTOCOL
The Universal Asynchronous Receiver/Transmitter (UART) of the PIC18F65J90 is
used to access the register map of the meter. In addition to the reading and writing of
the registers, there are also dedicated commands for clearing calibration registers,
loading calibration registers and storing calibration registers to flash. The first byte
UART 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'.
© 2012 Microchip Technology Inc.
DS51968A-page 31
MCP3901 and PIC18F65J90 Energy Meter Reference Design
4.1.1.4
“W” WRITE: WRITE STARTING AT SPECIFIED ADDRESS
Write specified bytes.
Example: 'W030000102030405060708090A0B0C0D0E0FX'.
Returns: 'W030000102030405060708090A0B0C0D0E0FX'.
Note:
If the 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 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
7 6 5 4 3 2 1 0
ASCII Data
“X” (ASCII)
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
TABLE 4-1:
WRITE COMMAND EXAMPLES
Description
WRITE of 255d to
PHA_W_OFF Register
FIGURE 4-1:
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 5 4 3 2 1 0
“X” (ASCII)
# Bytes to Read (2 Bytes ASCII)
7 6 5 4 3 2 1 0
TABLE 4-2:
7 6 5 4 3 2 1 0
READ on ENERGY_ACT_L_RAW Register
DS51968A-page 32
7 6 5 4 3 2 1 0
READ COMMAND EXAMPLES
DESCRIPTION
FIGURE 4-2:
7 6 5 4 3 2 1 0
COMMAND ASCII
COMMAND HEX
“R 0D4 06 X”
52 00 44 34 30 36 58
Read Command Protocol.
© 2012 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Appendix A. Schematic and Layouts
A.1
INTRODUCTION
This appendix contains the following schematics and layouts for the MCP3901 and
PIC18F65J90 Energy Meter Reference Design:
•
•
•
•
•
•
•
•
•
A.2
Board – ADC Schematic
Board – MCU Schematic
Board – LCD and USB Schematic
Board – Top Silk and Pads
Board – Top Copper
Board – Bottom Copper
Board – Bottom Silk and Pads
Board – Top 3D
Board – Bottom 3D
SCHEMATICS AND PCB LAYOUT
The layer order is shown in Figure A-1.
Top Layer
Bottom Layer
FIGURE A-1:
© 2011 Microchip Technology Inc.
Layer Order.
DS51968A-page 33
R3
L1
GNDB
CP4
GNDB
HIGH
275VAC
MOV1
R11
100
GNDA
1 IN
GNDA
C2
U2
GNDB
GNDA
L5
150
MCP1703
OUT 3
100nF
C7
GNDA
GNDA
GNDB
100nF
GNDA
100nF
C6
GNDA
C1
100nF
470UF
C11
GNDB
D2
MRA4005T3G
2 1
GNDB
D3
BZG03C15G
C9
L4
150 0.47uF
GNDA
NPO
R7 100nF
1K
C5
POWER
+9V IN
D1
2 MRA4005T3G
2 1
3
1
LOW
RAPC722
J1
GNDA
C8
1K
GNDA
NPO
100nF
R10
NPO
100nF
C4
GNDA
GNDA
NPO
100nF
C3
1K TF R4
300mA/150
L2 1K TF R5
300mA/150
GNDA
NONE
R6
NONE
CP3
R9
L3
R8
300mA/150 332K 332K
Shunt GND
HIGH
CP2
LINE_SHUNT2
LINE_SHUNT1
CP1
CP5
+5V
R2 10
AFE_SYNC
+5V
R1 10
2 GND
DS51968A-page 34
+5V
10UF
C13
GNDB GNDB
100nF
C12
SSOP20
MCP3901
U1
1 RESET
20
SDI
19
2 DVDD
SDO
18
3 AVDD
SCK
17
4
CS
CH0+
5
OSC2 16
CH015
6
CH1- OSC1/CLKI
14
7
CH1+
DR
8 AGND
MDAT0 13
9
12
REFIN/OUT+ MDAT1
11
10
REFIN
DGND
GNDB
100nF
C14
+5V
GNDB
AFE_CLKIN
AFE_DR
MPU_SDO
MPU_SDI
MPU_SCK
AFE_F0/CS
3
AFE_F0/CS
MPU_SDI
AFE_SYNC
AFE_CLKIN
MPU_SCK
MPU_SDO
GNDB
OUT
Q1
MCP1700T-3302E/TT
IN
TP3
TP4
TP6
TP7
TP1
TP2
GNDA
2
GNDB GNDB
100nF C10
10uF
C15
CAP-SMT-ELECTRO
+3.3V
(LOW)
(LOW)
TP5
!!! DANGER!!!
CONNECTING TO J1, P1 or TP5
MAY CAUSE EXTERNAL
EQUIPMENT DAMAGE
AND SHOCK HAZARD
GND
A.3
1
GNDA
MCP3901 and PIC18F65J90 Energy Meter Reference Design
BOARD – ADC SCHEMATIC
© 2011 Microchip Technology Inc.
C23
LCD_9B/9F/9E/NC
LCD_9A/0F/9E/9D
LCD_10B/10G/AOC/NC
REACTIVE PWR
R19
698
D6
RED
R22
698
GNDB
RED
GNDB
GM1JR35200AE
GNDB
R21
1.2k
D4
MCLR
RG3/VLCAP2
RG2/RX2/DT2/VLCAP1
RG1/TX2/CK2
RG0/LCDBIAS0
LCD_COM2
2
1
2
1
8
RG4/SEG26
9
VSS
10
VDDCORE/VCAP
11
RF7/AN5/SS/SEG25
12
RF6/AN11/SEG24
13
RF5/AN10/CVREF/SEG23
14
RF4/AN9/SEG22
15
RF3/AN8/SEG21
16
RF2/AN7/C1OUT/SEG20
7
6
RE1/LCDBIAS2
RE0/LCDBIAS1
GM1JR35200AE
GNDB
R18
1.2k
CF_REACTIVE
ACTIVE PWR
CF_ACTIVE
LCD_8B/8G/8C/NC
LCD_8A/8F/8E/8D
4
3
2
1
C24 5
C22
LCD_10A/10F/10E/10D
C26 10UF
MPU_RG4
MPU_MCLR
47NF
MPU_RG1
47NF
GNDB
GNDB
GNDB
47NF
47NF C21
GNDB
U6
PC365N
U7
PC365N
ENVREG
GNDB
+3.3V
R12 47NF
NONE C16
LCD_COM1
63
RE3/COM0
64
LCDBIAS3
RF1/AN6/C2OUT/SEG19
17
LCD_7A/7F/7E/7D
3
4
3
4
AVSS
62
RE4/COM1
AVDD
LCD_COM4
GNDB
HDR2X1
J2
1
HDR2X1
J3
2
18
+3.3V
19
+3.3V
1
2
LCD_COM3
61
RE5/COM2
60
+3.3V
LCD_1B/1G/1C/1P
GNDB
U3
PIC18F6XJ90-64TQFP
RE6/COM3
RA3/AN3/VREF+
CF_ACTIVE
20
RA2/AN2//VREF
22
CF_REACTIVE
RA1/AN1/SEG18
23
MEM_CS
VSS
GNDB
25
RA0/AN0
24
AFE_SYNC
26 VDD
+3.3V
21
LCD_V/K2/R/H2
59
RE7/CCP2(1)/SEG31
58
RD0/SEG0
57
VDD
LCD_3B/3G/3C/3P
55
RD1/SEG1
56
VSS
LCD_2A/2F/2E/2D
54
RA5/AN4/SEG15
LCD_1A/1F/1E/1D
GNDB
100NF
C30
AFE_F0/CS
27
LCD_2B/2G/2C/2P
IR_RX
RD2/SEG2
53
RD3/SEG3
52
LCD_3A/3F/3E/3D
51
RD4/SEG4
LCD_4A/4F/4E/4D
GNDB
+3.3V
MPU_SDI
MEM_CS
1
3 WP SCK 6
4 VSS
SI 5
7
VCC 8
2 SO HOLD
CS
25LC256-I/SM
U4
RB0/INT0/SEG30 48
47
RB1/INT1/SEG8
46
RB2/INT2/SEG9
45
RB3/INT3/SEG10
44
RB4/KBI0/SEG11
43
RB5/KBI1/SEG29
42
RB6/KBI2/PGC
VSS 41
40
OSC2/CLKO/RA6
39
OSC1/CLKI/RA7
38
VDD
37
RB7/KBI3/PGD
36
RC5/SDO/SEG12
35
RC4/SDI/SDA/SEG16
34
RC3/SCK/SCL/SEG17
33
RC2/CCP1/SEG13
RC7/RX1/DT1/SEG28
RD5/SEG5
RC0/T1OSO/T13CKI
IR_TX
30
LCD_4B/4G/4C/4P
49
RD7/SEG7
50
RD6/SEG6
RC6/TX1/CK1/SEG27
31
MPU_TX1
32
MPU_RX1
28 RA4/T0CKI/SEG14
29 RC1/T1OSI/CCP2/SEG12
LCD_V/K1/H1/A/W
+3.3V
+3.3V
GNDB
LCD_5A/5F/RE/5D
MPU_SDO
MPU_SCK
+3.3V
+3.3V
AFE_CLKIN
MPU_SCK
MPU_SDI
MPU_SDO
MPU_PGD
+3.3V
GNDB
+3.3V
GNDB
X1
27pF
C28
D5
MCP130
GNDB
MPU_MCLR
C31
100NF
GNDB
GNDB
100NF
C32
B3S-1002P
SW3
MOM-NC
PUSH=HI
SW2
GNDB
B3S-1002P
+3.3V
GNDB
100NF
C29
R16
R15
4.7K
IR_RX
GNDB
GNDB
GNDB
2
+3.3V
MPU_PGC
MPU_PGD
MPU_MCLR
SW1
GNDB
B3S-1002P
MOM-NC
PUSH=HI
GNDB
100NF
C25
IR_TX
1K
+3.3V
R20
698
MPU_RG1
U5
MCP130T-270/TT
1
2 VDD
OUT
+3.3V
DNP
ICD
+3.3V
GNDB
PIC18F65J90
5
6
1
2
3
4
R17
10K
+3.3V
R13
4.7K
1K
R14
MPU_RG4
U8
GP1US301XP
DNP
P1
HDR6X1
GL100MN1MP1
GNDB
GNDB GNDB
GNDB GNDB
27pF
C27
4MHz
LCD_7B/7G/7C/NC
LCD_6A/6F/6E/6D
LCD_6B/6G/6C/NC
MPU_PGC
+3.3V
GNDB
LCD_5B/5G/5C/NC
AFE_DR
+3.3V
100NF 100NF 100NF 100NF
C19
C20
C17
C18
1
3
4
© 2011 Microchip Technology Inc.
3 VSS
A.4
+3.3V
GNDB
Schematic and Layouts
BOARD – MCU SCHEMATIC
DS51968A-page 35
© 2011 Microchip Technology Inc.
12 MHz
GND
X2
R24
470
RESONATOR-CSTCE
LCD_COM4
28
R25
470
GND
C33
0.1uF
27
26
D7
11A/11F/11E/11D
COM2
V/K2/r/h2
COM3
K1h1/A/W
COM4
COM1
MCP2200_SSOP20
U10
VSS
VDD
D+
OSC1
DOSC2
VUSB
RST
GP7/TxLED
GP0/SSPND
GP6/RxLED GP1/USBCFG
GP2
GP5
CTS
GP4
RX
GP3
RTS
TX
USB_+5V
25
11B/11G/11C/NC
1
2
3
LCD_V/K1/H1/A/W
LCD_V/K2/R/H2
LCD_11A/AAF/11E/11D
4
LCD_11B/11G/11C/NC
5
LCD_10A/10F/10E/10D
6
LCD_10B/10G/AOC/NC
7
LCD_9A/0F/9E/9D
GND
C34
0.1uF
8
9
MCP2200_TX
MCP2200_RX
10
11
LCD_9B/9F/9E/NC
LCD_8A/8F/8E/8D
LCD_8B/8G/8C/NC
LCD_7A/7F/7E/7D
GND
12
LCD_7B/7G/7C/NC
ADUM1201
LCD_6A/6F/6E/6D
MPU_TX1
MPU_RX1
GND
6
5A/5F/5E/5D
U9
100NF
C35
5
3
4
2
GNDB
LCD_6B/6G/6C/NC
+3.3V
1
+3.3V
GNDB
GND
VDD1 VDD2
VIA
VOA
VOB
VIB
GND1 GND2
U11
D-
D+
USB_+5V
13
14
LCD1
3
4
LCD_COM3
LCD_COM2
R23
LCD_COM1
INDIA LCD
GREEN
2
1
RED
470
10A/10F/10E/10D
10B/10G/10C/NC
9A/9F/9E/9D
9B/9G/9C/NC
8A/8F/8E/8D
8B/8G/8C/NC
7A/7F/7E/7D
7B/7G/7C/NC
6A/6F/6E/6D
6B/6G/6C/NC
DS51968A-page 36
7
!!! DANGER !!!
CONNECTING TO J1, P1, J2 OR TP1
MAY CAUSE EXTERNAL
EQUIPMENT DAMAGE
AND SHOCK HAZARD
USB_MINIB_VERTICAL
5B/5G/5C/NC
LCD_1B/1G/1C/1P
LCD_1A/1F/1E/1D
LCD_2B/2G/2C/2P
LCD_2A/2F/2E/2D
24
23
22
21
1B/1G/1C/1P
1A/1F/1E/1D
2B/2G/2C/2P
2A/2F/2E/2D
4A/4F/4E/4D
4B/4G/4C/4P
3A/3F/3E/3D
3B/3G/3C/3P
15
16
17
LCD_5A/5F/RE/5D
LCD_5B/5G/5C/NC
LCD_4A/4F/4E/4D
18
LCD_4B/4G/4C/4P
19
LCD_3A/3F/3E/3D
20
LCD_3B/3G/3C/3P
LCD
A.5
BOARD – LCD AND USB SCHEMATIC
MCP3901 and PIC18F65J90 Energy Meter Reference Design
Schematic and Layouts
A.6
BOARD – TOP SILK AND PADS
© 2011 Microchip Technology Inc.
DS51968A-page 37
MCP3901 and PIC18F65J90 Energy Meter Reference Design
A.7
BOARD – TOP COPPER
DS51968A-page 38
© 2011 Microchip Technology Inc.
Schematic and Layouts
A.8
BOARD – BOTTOM COPPER
© 2011 Microchip Technology Inc.
DS51968A-page 39
MCP3901 and PIC18F65J90 Energy Meter Reference Design
A.9
BOARD – BOTTOM SILK AND PADS
DS51968A-page 40
© 2011 Microchip Technology Inc.
Schematic and Layouts
A.10 BOARD – TOP 3D
© 2011 Microchip Technology Inc.
DS51968A-page 41
MCP3901 and PIC18F65J90 Energy Meter Reference Design
A.11 BOARD – BOTTOM 3D
DS51968A-page 42
© 2011 Microchip Technology Inc.
MCP3901 AND PIC18F65J90
ENERGY METER
REFERENCE DESIGN
Appendix B. Bill of Materials (BOM)
TABLE B-1:
Qty
BILL OF MATERIALS (BOM)
Reference
Description
Manufacturer
Part Number
20
C1, C2, C5, C6 CAP CER .1UF 25V 10% X7R 0603
C7, C8, C12,
C14, C15, C17,
C18, C19, C20,
C25, C29, C30,
C31, C33, C34,
C35
Murata
Electronics®
GRM188R71E104KA01D
2
C3, C4
CAP CER .1UF 25V X7R 1206 FO
KEMET®
C1206F104K3RACTU
1
C9
CAP .47UF 305VAC Lead Spacing 22.5
mm, WxHxL = 10.5 x 16.5 x 26.5
EPCOS Inc.
B32933B3474K000
1
C10
CAP 10UF 16V ELECT FC SMD
Panasonic® - ECG
EEE-FC1C100R
1
C11
CAP 470UF 25V ELECT FC SMD
Panasonic - ECG
EEE-FC1E471P
2
C13, C26
CAP CER 10UF 6.3V X5R 0603
Murata Electronics
GRM188R60J106ME47D
5
C16, C21, C22, CAP CER 47000PF 25V 10% X7R 0603
C23, C24
Murata Electronics
GRM188R71473KA01D
2
C27, C28
CAP CER 27PF 50V 5% C0G 0603
TDK Corporation
C1608C0G1H270J
2
D1, D2
DIODE SCHOTTKY 40V 1A SMB
ON
Semiconductor®
MBRS140T3G
1
D3
DIODE ZENER 15V 1.5W SMA
ON Semiconductor BZG03C15G
2
D4, D6
LED 1.6X0.8MM 625NM RED CLR SMD
Kingbright Corp.
APT1608EC
1
D7
LED 2X1.2MM RD/GN WTR CLR SMD
Kingbright Corp.
APHBM2012SURKCGKC
1
J1
CONN POWERJACK MINI R/A T/H
CUI Inc.
PJ-102B
3
L1, L2, L3
FERRITE 300MA 150 OHM 1806 SMD
Laird-Signal
Integrity Products
LI1806C151R-10
2
L4, L5
FERRITE 300MA 150 OHM 1806 SMD
Laird-Signal
Integrity Products
LI1806C151R-10
1
LCD1
Energy Meter LCD Display
Deepakshi
Display Devices
DP-093
1
MOV 1
VARISTOR 275V RMS 20MM RADIAL
EPCOS Inc.
S20K275E2
1
P1
6 X 1 Header 2.54 mm on center 6 mm/2.5
mm
Samtec
TSW-106-07-G-S
1
PCB
RoHS Compliant Bare PCB, MCP3901
PIC18F65J90 Shunt Meter Ref Des
1
Q1
IC REG LDO 3.3V 250MA SOT23-3
Microchip
Technology Inc.
MCP1700T-3302E/TT
2
R1, R2
RES 10.0 OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF10R0V
4
R4, R5, R7,
R10
RES 1.00K OHM 1/8W 1% 0805 SMD
Panasonic - ECG
ERJ-6ENF1001V
2
R8, R9
RES 332K OHM 1/4 1% 1206 SMD
YAGEO Corp.
RC1206FR-07332KL
Note 1:
—
104-00342
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.
© 2012 Microchip Technology Inc.
DS51968A-page 43
MCP3901 and PIC18F65J90 Energy Meter Reference Design
TABLE B-1:
Qty
BILL OF MATERIALS (BOM) (CONTINUED)
Reference
Description
Manufacturer
Part Number
1
R11
RES 100 OHM 1W 5% 2512 SMD
Panasonic - ECG
ERJ-1TNF1000U
2
R13, R15
RES 4.70K OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF4701V
2
R14, R16
RES 1.00K OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1001V
1
R17
RES 10.0K OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1002V
2
R18, R21
RES 100 OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF1000V
2
R19, R22
RES 698 OHM 1/10W 1% 0603 SMD
Rohm
Semiconductor
MCR03EZPFX6980
3
R23, R24, R25
RES 470 OHM 1/10W 1% 0603 SMD
Panasonic - ECG
ERJ-3EKF4700V
3
SW1, SW2,
SW3
SWITCH TACT 6MM 230GF H=4.3MM
Omron Electronics
B3S-1002P
1
TP5
Wire Test Point 0.3” Length
Component
Corporation
PJ-202-30
1
U1
IC ENERGY METER SSOP-20
Microchip
Technology Inc.
MCP3901AO-I/SS
1
U2
IC REG LDO 5V 250MA SOT-223-3
Microchip
Technology Inc.
MCP1703-5002E/DB
1
U3
64/80-Pin, High-Performance MicroconMicrochip
trollers with LCD Driver and nanoWatt Tech- Technology Inc.
nology TQFP-64
PIC18F65J90-I/PTY
1
U4
256K SPI Bus Serial EEPROM SOIC-8
Microchip
Technology Inc.
25LC256-I/SN
2
U6, U7
PHOTOCOUPLER DARL OUT 4-SMD
Sharp®
Electronic Corp.
PC36NJ0000F
1
U9
CONN RUGGED USB RCPT VERT MINI B Amphenol
Commercial
MUSBB55104
1
U10
IC USB TO UART SSOP-20
Microchip
Technology Inc.
MCP2200-I/SS
1
U11
IC ISOLATOR DIGITAL DUAL 8-SOIC
Analog Devices
Inc.
ADUM1201CRZ-RL7
1
X1
CRYSTAL 4.000 MHZ 18PF SMD
Abracon
Corporation
ABLS-4.000MHZ-B4-T
1
X2
CER RESONATOR 12.0MHZ SMD
Murata Electronics
CSTCE12M0G55-R0
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.
TABLE B-2:
Qty
BILL OF MATERIALS (COMPONENTS NOT INSTALLED)
Reference
Description
Manufacturer
Part Number
1
C32
CAP CER .1UF 25V 10% X7R 0603
—
—
1
D5
DO NOT INSTALL
—
—
2
J2, J3
DO NOT INSTALL
—
—
2
R3, R6
DO NOT INSTALL
—
—
1
R12
DO NOT INSTALL
—
—
1
R20
RES 698 OHM 1/10W 0603 SMD
—
—
1
U5
Microcontroller Supervisory Circuit
with Open Drain Output SOT23-3
—
—
1
C32
CAP CER .1UF 25V 10% X7R 0603
—
—
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
DS51968A-page 44
© 2012 Microchip Technology Inc.
© 2012 Microchip Technology Inc.
DS51968A-page 45
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://www.microchip.com/
support
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: 91-80-3090-4123
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 - Osaka
Tel: 81-66-152-7160
Fax: 81-66-152-9310
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
Indianapolis
Noblesville, IN
Tel: 317-773-8323
Fax: 317-773-5453
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: 86-10-8569-7000
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
China - Chongqing
Tel: 86-23-8980-9588
Fax: 86-23-8980-9500
Korea - Daegu
Tel: 82-53-744-4301
Fax: 82-53-744-4302
China - Hangzhou
Tel: 86-571-2819-3187
Fax: 86-571-2819-3189
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Kuala Lumpur
Tel: 60-3-6201-9857
Fax: 60-3-6201-9859
China - Nanjing
Tel: 86-25-8473-2460
Fax: 86-25-8473-2470
Malaysia - Penang
Tel: 60-4-227-8870
Fax: 60-4-227-4068
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-5778-366
Fax: 886-3-5770-955
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-330-9305
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
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 - Xiamen
Tel: 86-592-2388138
Fax: 86-592-2388130
China - Zhuhai
Tel: 86-756-3210040
Fax: 86-756-3210049
DS51968A-page 46
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
11/29/11
© 2012 Microchip Technology Inc.