71M6531D/F, 71M6532D/F
Energy Meter IC
Simplifying System Integration
TM
DATA SHEET
19-5374; Rev 1; 4/13
GENERAL DESCRIPTION
The 71M6531D/F and 71M6532D/F are highly
integrated SOCs with an MPU core, RTC, FLASH and LCD
driver. The patented Single Converter Technology® with a
22-bit delta-sigma ADC, four analog inputs, digital tempera-
ture compensation, precision voltage reference, battery voltage
monitor and 32-bit computation engine (CE) supports a wide
range of residential metering applications with very few low-
cost external components.
A 32-kHz crystal time base for the entire system and internal
battery backup support for RAM and RTC further reduce system
cost. The IC supports 2-wire, and 3-wire single-phase and
dual-phase residential metering along with tamper-detection
mechanisms. The 71M6531D/F offers single-ended inputs for
two current channels and two single-ended voltage inputs.
The 71M6532D/F has two differential current inputs and three
single-ended voltage inputs.
Maximum design flexibility is provided by multiple UARTs, I C,
μWire, up to 21 DIO pins and in-system programmable FLASH
memory, which can be updated with data or application code
in operation.
A complete array of ICE and development tools, programming
libraries and reference designs enable rapid development and
certification of TOU, AMR and Prepay meters that comply with
worldwide electricity metering standards.
2
FEATURES
•
Wh accuracy < 0.1% over 2000:1 current
range
•
Exceeds IEC62053/ANSI C12.20 standards
•
Four sensor inputs
•
Low-jitter Wh and VARh plus two additional
pulse test outputs (4 total, 10 kHz maximum)
with pulse count
•
Four-quadrant metering
•
Tamper detection (Neutral current with CT,
Rogowski or shunt, magnetic tamper input)
•
Line frequency count for RTC
•
Digital temperature compensation
•
Sag detection for phase A and B
•
Independent 32-bit compute engine
•
46-64 Hz line frequency range with same
calibration. Phase compensation (± 7°)
•
Three battery modes with wake-up on timer
or push-button:
BROWNOUT Mode (52 µA typ.)
LCD Mode (21 µA typ., DAC active)
SLEEP Mode (0.7 µA typ.)
•
Energy display during mains power failure
•
39 mW typical consumption @ 3.3 V, MPU
clock frequency 614 kHz
•
22-bit delta-sigma ADC with 3360 Hz or
2520 Hz sample rate
•
8-bit MPU (80515),1 clock cycle per instruction,
10 MHz maximum, with integrated ICE for
debug
•
RTC for TOU functions with clock-rate adjust
register
•
Hardware watchdog timer, power fail monitor
•
LCD driver with 4 common segment drivers:
Up to 156 (71M6531D/F) or 268 pixels
(71M6532D/F)
•
Up to 22 (71M6531D/F) or 43 (71M6532D/F)
general-purpose I/O pins. Digital I/O pins
compatible with 5 V inputs
•
32 kHz time base
•
High-speed slave SPI interface to data RAM
•
Two UARTs for IR and AMR, IR driver with
modulation
•
FLASH memory with security and in-system
program update:
128 KB (71M6531D/32D)
256 KB (71M6531F/32F)
•
4 KB MPU XRAM
•
Industrial temperature range
•
68-pin QFN package for 71M6531D/F pin-
compatible with 71M6521, 100-pin LQFP
package for 71M6532D/F, lead free
1
A
CT/SHUNT
LOAD
NEUTRAL
CT
LOAD
POWER SUPPLY
B
ADC
IAP*
IAN*
VA
IBP*
IBN*
VB
V3.3A
V3.3
SYS
GNDA GNDD
PWR MODE
CONTROL
71M6531
71M6532
TEMP
SENSOR
WAKE-UP
REGULATOR
VBAT
V2.5
BATTERY
VOLTAGE REF
VREF
VBIAS
SERIAL PORTS
LCD & DIO
COM0..3
RAM
FLASH
MEMORY
COMPUTE
ENGINE
LCD SEG
SEG/DIO
88.88.8888
I2C or µWire
EEPROM
TEST PULSES
AMR
TX
RX
RX/DIO1
IR
POWER
FAULT
32 kHz
TX/DIO2
SENSE
DRIVE/MOD
COMPARATOR
V1
OSC/PLL
XIN
XOUT
*
MPU
TIMERS
RTC
ICE I/F
ICE_E
02/18/2009
SPI
SPI HOST
V3P3D
GNDD
Differential pins only on 6532D/F
Rev 2
Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
Table of Contents
1
Hardware Description ....................................................................................................................... 10
1.1 Hardware Overview ................................................................................................................... 10
1.2 Analog Front End (AFE)............................................................................................................. 10
1.2.1 Signal Input Pins ............................................................................................................ 10
1.2.2 Input Multiplexer............................................................................................................. 11
1.2.3 A/D Converter (ADC) ..................................................................................................... 12
1.2.4 FIR Filter ........................................................................................................................ 12
1.2.5 Voltage References ....................................................................................................... 12
1.2.6 Temperature Sensor ...................................................................................................... 14
1.2.7 Battery Monitor............................................................................................................... 14
1.2.8 AFE Functional Description ........................................................................................... 14
1.2.9 Digital Computation Engine (CE) ................................................................................... 15
1.2.10 Meter Equations ............................................................................................................. 16
1.2.11 Real-Time Monitor ......................................................................................................... 16
1.2.12 Pulse Generators ........................................................................................................... 16
1.2.13 Data RAM (XRAM) ........................................................................................................ 17
1.2.14 Delay Compensation ..................................................................................................... 17
1.2.15 CE Functional Overview ................................................................................................ 17
1.3 80515 MPU Core ....................................................................................................................... 19
1.3.1 Memory Organization and Addressing .......................................................................... 19
1.3.2 Special Function Registers (SFRs)................................................................................ 21
1.3.3 Generic 80515 Special Function Registers ................................................................... 22
1.3.4 Special Function Registers (SFRs) Specific to the 71M6531D/F and 71M6532D/F ..... 24
1.3.5 Instruction Set ................................................................................................................ 26
1.3.6 UARTs ........................................................................................................................... 26
1.3.7 Timers and Counters ..................................................................................................... 28
1.3.8 WD Timer (Software Watchdog Timer) ......................................................................... 30
1.3.9 Interrupts ........................................................................................................................ 30
1.4 On-Chip Resources ................................................................................................................... 36
1.4.1 Oscillator ........................................................................................................................ 36
1.4.2 Internal Clocks ............................................................................................................... 36
1.4.3 Real-Time Clock (RTC) ................................................................................................. 37
1.4.4 Temperature Sensor ...................................................................................................... 38
1.4.5 Physical Memory............................................................................................................ 38
1.4.6 Optical Interface ............................................................................................................. 40
1.4.7 Digital I/O – 71M6531D/F .............................................................................................. 41
1.4.8 Digital I/O – 71M6532D/F .............................................................................................. 43
1.4.9 Digital IO – Common Characteristics for 71M6531D/F and 71M6532D/F .................... 44
1.4.10 LCD Drivers – 71M6531D/F .......................................................................................... 45
1.4.11 LCD Drivers – 71M6532D/F .......................................................................................... 46
1.4.12 LCD Drivers – Common Characteristics for 71M6531D/F and 71M6532D/F ............... 46
1.4.13 Battery Monitor............................................................................................................... 46
1.4.14 EEPROM Interface ........................................................................................................ 46
1.4.15 SPI Slave Port................................................................................................................ 49
1.4.16 Hardware Watchdog Timer ............................................................................................ 52
1.4.17 Test Ports (TMUXOUT pin) ........................................................................................... 53
2
Rev 2
FDS 6531/6532 005
2
Data Sheet 71M6531D/F-71M6532D/F
3
4
Functional Description ..................................................................................................................... 54
2.1 Theory of Operation ................................................................................................................... 54
2.2 System Timing Summary ........................................................................................................... 55
2.3 Battery Modes ............................................................................................................................ 56
2.3.1 BROWNOUT Mode ....................................................................................................... 57
2.3.2 LCD Mode ...................................................................................................................... 58
2.3.3 SLEEP Mode ................................................................................................................. 58
2.4 Fault and Reset Behavior .......................................................................................................... 60
2.4.1 Reset Mode.................................................................................................................... 60
2.4.2 Power Fault Circuit ........................................................................................................ 60
2.5 Wake-Up Behavior ..................................................................................................................... 61
2.5.1 Wake on PB ................................................................................................................... 61
2.5.2 Wake on Timer............................................................................................................... 61
2.6 Data Flow ................................................................................................................................... 61
2.7 CE/MPU Communication ........................................................................................................... 62
Application Information .................................................................................................................... 63
3.1 Connection of Sensors............................................................................................................... 63
3.2 Connecting 5-V Devices ............................................................................................................ 63
3.3 Temperature Measurement ....................................................................................................... 64
3.4 Temperature Compensation ...................................................................................................... 64
3.4.1 Temperature Coefficients: ............................................................................................. 64
3.4.2 Temperature Compensation for VREF .......................................................................... 65
3.4.3 System Temperature Compensation ............................................................................. 65
3.4.4 Temperature Compensation for the RTC ...................................................................... 65
3.5 Connecting LCDs ....................................................................................................................... 66
2
3.6 Connecting I C EEPROMs ........................................................................................................ 66
3.7 Connecting Three-Wire EEPROMs ........................................................................................... 67
3.8 UART0 (TX/RX) ......................................................................................................................... 67
3.9 Optical Interface (UART1).......................................................................................................... 67
3.10 Connecting the V1 Pin ............................................................................................................... 68
3.11 Connecting the Reset Pin .......................................................................................................... 69
3.12 Connecting the Emulator Port Pins ............................................................................................ 69
3.13 Connecting a Battery ................................................................................................................. 69
3.14 Flash Programming.................................................................................................................... 70
3.15 MPU Firmware ........................................................................................................................... 70
3.16 Crystal Oscillator ........................................................................................................................ 70
3.17 Meter Calibration ........................................................................................................................ 71
Firmware Interface ............................................................................................................................ 72
4.1 I/O RAM and SFR Map – Functional Order ............................................................................... 72
4.2 I/O RAM Description – Alphabetical Order ................................................................................ 77
4.3 CE Interface Description ............................................................................................................ 88
4.3.1 CE Program ................................................................................................................... 88
4.3.2 CE Data Format ............................................................................................................. 88
4.3.3 Constants ....................................................................................................................... 88
4.3.4 Environment ................................................................................................................... 88
4.3.5 CE Calculations ............................................................................................................. 89
4.3.6 CE Status and Control ................................................................................................... 89
4.3.7 CE Transfer Variables ................................................................................................... 92
4.3.8 Pulse Generation ........................................................................................................... 93
4.3.9 CE Calibration Parameters ............................................................................................ 94
3
Rev 2
Data Sheet 71M6531D/F-71M6532D/F
FDS 6531/6532 005
4.3.10 Other CE Parameters .................................................................................................... 95
4.3.11 CE Flow Diagrams ......................................................................................................... 95
5
Electrical Specifications................................................................................................................... 98
5.1 Absolute Maximum Ratings ....................................................................................................... 98
5.2 Recommended External Components ....................................................................................... 99
5.3 Recommended Operating Conditions ........................................................................................ 99
5.4 Performance Specifications ..................................................................................................... 100
5.4.1 Input Logic Levels ........................................................................................................ 100
5.4.2 Output Logic Levels ..................................................................................................... 100
5.4.3 Power-Fault Comparator ............................................................................................. 100
5.4.4 Battery Monitor............................................................................................................. 100
5.4.5 Supply Current ............................................................................................................. 101
5.4.6 V3P3D Switch .............................................................................................................. 101
5.4.7 2.5 V Voltage Regulator ............................................................................................... 101
5.4.8 Low-Power Voltage Regulator ..................................................................................... 101
5.4.9 Crystal Oscillator .......................................................................................................... 102
5.4.10 LCD DAC ..................................................................................................................... 102
5.4.11 LCD Drivers ................................................................................................................. 102
5.4.12 Optical Interface ........................................................................................................... 102
5.4.13 Temperature Sensor .................................................................................................... 103
5.4.14 VREF ........................................................................................................................... 103
5.4.15 ADC Converter, V3P3A Referenced............................................................................ 104
5.5 Timing Specifications ............................................................................................................... 106
5.5.1 Flash Memory .............................................................................................................. 106
5.5.2 EEPROM Interface ...................................................................................................... 106
5.5.3 RESET ......................................................................................................................... 106
5.5.4 RTC.............................................................................................................................. 106
5.5.5 SPI Slave Port (MISSION Mode) ................................................................................. 107
5.6 Typical Performance Data ....................................................................................................... 108
5.6.1 Accuracy over Current ................................................................................................. 108
5.6.2 Accuracy over Temperature ........................................................................................ 108
5.7 71M6531D/F Package ............................................................................................................. 109
5.7.1 Package Outline .......................................................................................................... 109
5.7.2 71M6531D/F Pinout (QFN-68)..................................................................................... 110
5.7.3 Recommended PCB Land Pattern for the QFN-68 Package ...................................... 111
5.8 71M6532D/F Package ............................................................................................................. 112
5.8.1 71M6532D/F Pinout (LQFP-100) ................................................................................. 112
5.8.2 LQFP-100 Mechanical Drawing ................................................................................... 113
5.9 Pin Descriptions ....................................................................................................................... 114
5.9.1 Power and Ground Pins ............................................................................................... 114
5.9.2 Analog Pins .................................................................................................................. 114
5.9.3 Digital Pins ................................................................................................................... 115
5.9.4 I/O Equivalent Circuits ................................................................................................. 116
6
Ordering Information ...................................................................................................................... 117
7
Related Information ........................................................................................................................ 117
8
Contact Information ........................................................................................................................ 117
Appendix A: Acronyms .......................................................................................................................... 118
Appendix B: Revision History................................................................................................................ 119
4
Rev 2
FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
Figures
Figure 1: 71M6531D/F IC Functional Block Diagram ................................................................................... 8
Figure 2: 71M6532D/F IC Functional Block Diagram ................................................................................... 9
Figure 3: General Topology of a Chopped Amplifier .................................................................................. 13
Figure 4: CROSS Signal with
CHOP_E[1:0]
= 00 ....................................................................................... 13
Figure 5: AFE Block Diagram (Shown for the 71M6532D/F) ...................................................................... 14
Figure 6: Samples from Multiplexer Cycle .................................................................................................. 18
Figure 7: Accumulation Interval................................................................................................................... 18
Figure 8: Interrupt Structure ........................................................................................................................ 35
Figure 9: Optical Interface ........................................................................................................................... 41
Figure 10: Connecting an External Load to DIO Pins ................................................................................. 45
Figure 11: 3-Wire Interface. Write Command, HiZ=0 ................................................................................ 48
Figure 12: 3-Wire Interface. Write Command, HiZ=1 ................................................................................ 48
Figure 13: 3-Wire Interface. Read Command. ........................................................................................... 49
Figure 14: 3-Wire Interface. Write Command when CNT=0 ...................................................................... 49
Figure 15: 3-Wire Interface. Write Command when HiZ=1 and WFR=1 ................................................... 49
Figure 16: SPI Slave Port: Typical Read and Write operations .................................................................. 51
Figure 17: Functions defined by V1 ............................................................................................................ 52
Figure 18: Voltage, Current, Momentary and Accumulated Energy ........................................................... 54
Figure 19: Timing Relationship between ADC MUX, Compute Engine ...................................................... 55
Figure 20: RTM Output Format ................................................................................................................... 55
Figure 21: Operation Modes State Diagram ............................................................................................... 56
Figure 22: Transition from BROWNOUT to MISSION Mode when System Power Returns ...................... 59
Figure 23: Power-Up Timing with V3P3SYS and VBAT tied together ........................................................ 59
Figure 24: Power-Up Timing with VBAT only.............................................................................................. 60
Figure 25: Wake Up Timing ........................................................................................................................ 61
Figure 26: MPU/CE Data Flow .................................................................................................................... 62
Figure 27: MPU/CE Communication ........................................................................................................... 62
Figure 28: Resistive Voltage Divider ........................................................................................................... 63
Figure 29: CT with Single Ended (Left) and Differential Input (Right) Connection ..................................... 63
Figure 30: Resistive Shunt (Left) and Rogowski Sensor (Right) Connection ............................................. 63
Figure 31: Connecting LCDs ....................................................................................................................... 66
2
Figure 32: I C EEPROM Connection .......................................................................................................... 66
Figure 33: Three-Wire EEPROM Connection ............................................................................................. 67
Figure 34: Connections for UART0 ............................................................................................................. 67
Figure 35: Connection for Optical Components .......................................................................................... 68
Figure 36: Voltage Divider for V1 ................................................................................................................ 68
Figure 37: External Components for the RESET Pin: Push-button (Left), Production Circuit (Right) ........ 69
Figure 38: External Components for the Emulator Interface ...................................................................... 69
Figure 39: Connecting a Battery ................................................................................................................. 70
Figure 40: CE Data Flow: Multiplexer and ADC.......................................................................................... 96
Figure 41: CE Data Flow: Scaling, Gain Control, Intermediate Variables .................................................. 96
Figure 42: CE Data Flow: Squaring and Summation Stages ...................................................................... 97
Figure 43: SPI Slave Port (MISSION Mode) Timing ................................................................................. 107
Figure 44: Wh Accuracy, 0.1 A to 200 A at 240 V/50 Hz and Room Temperature .................................. 108
Figure 45: QFN-68 Package Outline, Top and Side View ........................................................................ 109
Figure 46: QFN-68 Package Outline, Bottom View .................................................................................. 109
Figure 47: Pinout for QFN-68 Package..................................................................................................... 110
Figure 48: PCB Land Pattern for QFN 68 Package .................................................................................. 111
Figure 49: PCB Land Pattern for LQFP-100 Package .............................................................................. 112
Figure 50: LQFP-100 Package, Mechanical Drawing ............................................................................... 113
Figure 51: I/O Equivalent Circuits ............................................................................................................. 116
Rev 2
5
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