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71M6511-IGTR/F
Single-Phase Energy Meter ICs
71M6511/71M6511H
Single-Phase Energy Meter IC DATA SHEET
NOVEMBER 2010
A Maxim Integrated Products Brand
GENERAL DESCRIPTION The 71M6511 is a highly integrated SOC with an MPU core, RTC, flash,
and LCD driver. Our Single Converter Technology® with a 22-bit delta-
sigma ADC, three analog inputs, digital temperature compensation,
precision voltage reference, and 32-bit computation engine (CE) supports a
wide range of single-phase metering applications with very few low cost
external components. A 32kHz crystal time base for the entire system and
internal battery backup support for RAM and RTC further reduce system
cost.
Maximum design flexibility is supported with multiple UARTs, I2C, a power
fail comparator, a 5V LCD charge pump, up to 12 DIO pins and an in-
system programmable flash. The device is offered in high (0.1%) and
standard (0.5%) accuracy versions for multifunction
residential/commercial meter applications requiring multiple
voltage/current inputs and complex LCD or DIO configurations.
A complete array of ICE and development tools, programming libraries and
reference designs enable rapid development and certification of meters that
meet most demanding worldwide electricity metering standards.
MPU
RTC
TIMERS
XIN
XOUT
VREF
COM0..3
V3.3AV3.3D
VBAT
V2.5
VLCD
VBIAS
VDRV
SEG0..19
GNDAGNDD
SEG 24..32
DIO 0..11
SEG 32..41
DIO 12..21
ICE
LOAD
EEPROM
POWER
FAULT
IR
AMR
TEST PULSES
BATTERY
COMPARATORSENSE
DRIVE
SERIAL PORTS
OSC/PLL
CONVERTER
LCD DRIVER
DIO, PULSECOMPUTE
ENGINE
FLASH
RAM
VOLTAGE REF
REGULATOR
5V BOOSTPOWER SUPPLY
TERIDIAN
71M65113V/5V LCD
TEMP
SENSOR
V or I
32 kHz
LIVE
NEUTCT/SHUNT
7/20/2007
FEATURES Wh accuracy < 0.1% over 2000:1
range Exceeds IEC 62053/ANSIC 12.20 Voltage reference
< 10ppm/°C -- 71M6511H,
< 50ppm/°C -- 71M6511 Three sensor inputs - VDD referenced Low jitter Wh/VARh pulse outputs Pulse count for pulse outputs Four-quadrant metering Voltage/current angle Line frequency count for RTC Digital temperature compensation Sag detection Independent 32-bit compute engine 40-70Hz line frequency range with
same calibration Phase compensation (±7°) Battery backup for RAM and RTC 22mW at 3.3V, 7.2µW backup Flash memory option with security 22-bit delta-sigma ADC 8-bit MPU (80515) - 1 clock cycle per
instruction LCD driver (≤ 128 pixels) High speed SSI serial output RTC for time-of-use functions Hardware watchdog timer Up to 12 general-purpose I/O pins 64KB flash, 7KB RAM Two UARTs for IR and AMR 64-lead LQFP package
19-5359; Rev 11/10
Single Converter Technology is a registered trademark of
71M6511/71M6511H
Single-Phase Energy Meter IC DATA SHEET
NOVEMBER 2010
A Maxim Integrated Products Brand
Table of Contents GENERAL DESCRIPTION ..................................................................................................................................... 1
FEATURES ............................................................................................................................................. 1
HARDWARE DESCRIPTION ................................................................................................................................. 8
Hardware Overview .................................................................................................................................. 8
Analog Front End (AFE) ........................................................................................................................... 8
Multiplexer.................................................................................................................................. 8
ADC ........................................................................................................................................... 9
FIR Filter .................................................................................................................................... 9
Voltage Reference ...................................................................................................................... 9
Temperature Sensor ................................................................................................................... 10
Functional Description ................................................................................................................ 10
Computation Engine (CE) ......................................................................................................................... 11
Meter Equations ......................................................................................................................... 12
Pulse Generator ......................................................................................................................... 12
Real-Time Monitor ...................................................................................................................... 13
CE Functional Overview ............................................................................................................. 13
80515 MPU Core ..................................................................................................................................... 15
80515 Overview ......................................................................................................................... 15
Memory Organization ................................................................................................................. 15
Special Function Registers (SFRs) .............................................................................................. 17
Special Function Registers (Generic 80515 SFRs) ...................................................................... 18
Special Function Registers Specific to the 71M6511 .................................................................... 20
Instruction Set ............................................................................................................................ 21
UART ......................................................................................................................................... 21
Timers and Counters .................................................................................................................. 24
WD Timer (Software Watchdog Timer) ........................................................................................ 26
Interrupts .................................................................................................................................... 29
External Interrupts ...................................................................................................................... 32
Interrupt Priority Level Structure .................................................................................................. 34
Interrupt Sources and Vectors ..................................................................................................... 35
On-Chip Resources .................................................................................................................................. 37
DIO Ports ................................................................................................................................... 37
Physical Memory ........................................................................................................................ 38
Oscillator .................................................................................................................................... 39
Real-Time Clock (RTC)............................................................................................................... 40
LCD Drivers ............................................................................................................................... 40
LCD Voltage Boost Circuitry........................................................................................................ 41
UART (UART0) and Optical Port (UART1)................................................................................... 41
Hardware Reset Mechanisms ..................................................................................................... 42
Reset Pin (RESETZ)................................................................................................................... 42
Hardware Watchdog Timer ......................................................................................................... 42
Crystal Frequency Monitor .......................................................................................................... 42
V1 Pin ........................................................................................................................................ 42
I2C Interface (EEPROM) ............................................................................................................ 43
Internal Clocks and Clock Dividers .............................................................................................. 44
Battery ....................................................................................................................................... 44
Internal Voltages (VBIAS, VBAT, V2P5) ...................................................................................... 44
71M6511/71M6511H
Single-Phase Energy Meter IC DATA SHEET
NOVEMBER 2010
A Maxim Integrated Products Brand FUNCTIONAL DESCRIPTION ............................................................................................................................... 47
Theory of Operation ................................................................................................................................. 47
System Timing Summary.......................................................................................................................... 47
Data Flow ................................................................................................................................................ 50
CE/MPU Communication .......................................................................................................................... 50
Fault, Reset, Power-Up ............................................................................................................................ 51
Battery Operation ..................................................................................................................................... 52
Power Save Modes .................................................................................................................................. 52
Temperature Compensation ..................................................................................................................... 53
Chopping Circuitry .................................................................................................................................... 53
Internal/External Pulse Generation and Pulse Counting ............................................................................. 55
Program Security ..................................................................................................................................... 56
FIRMWARE INTERFACE ...................................................................................................................................... 57
I/O RAM MAP – In Numerical Order .......................................................................................................... 57
SFR MAP (SFRs Specific to TERIDIAN 80515) – In Numerical Order ........................................................ 58
I/O RAM (Configuration RAM) – Alphabetical Order................................................................................... 59
CE Program and Environment .................................................................................................................. 65
CE Program ............................................................................................................................... 65
Formats...................................................................................................................................... 65
Constants ................................................................................................................................... 65
Environment ............................................................................................................................... 66
CE Calculations .......................................................................................................................... 66
CE RAM Locations ................................................................................................................................... 67
CE Front End Data (Raw Data) ................................................................................................... 67
CE Status Word.......................................................................................................................... 67
CE Transfer Variables ................................................................................................................ 68
TYPICAL PERFORMANCE DATA.......................................................................................................................... 75
Wh Accuracy at Room Temperature ......................................................................................................... 75
VARh Accuracy at Room Temperature ..................................................................................................... 75
Harmonic Performance ............................................................................................................................. 76
Meter Accuracy over Temperature (71M6511H) ........................................................................................ 76
APPLICATION INFORMATION .............................................................................................................................. 77
Connection of Sensors (CT, Resistive Shunt, Rogowski Coil) .................................................................... 77
Distinction between 71M6511 and 71M6511H Parts .................................................................................. 77
Temperature Compensation and Mains Frequency Stabilization for the RTC.............................................. 78
External Temperature Compensation ........................................................................................................ 79
Temperature Measurement ...................................................................................................................... 79
Connecting LCDs ..................................................................................................................................... 80
Connecting I2C EEPROMs ....................................................................................................................... 82
Connecting 5V Devices ............................................................................................................................ 82
Optical Interface ....................................................................................................................................... 83
Connecting V1 and Reset Pins ................................................................................................................. 83
Flash Programming .................................................................................................................................. 84
MPU Firmware Library.............................................................................................................................. 84
SPECIFICATIONS ................................................................................................................................................. 85
Electrical Specifications ............................................................................................................................ 85
LOGIC LEVELS.......................................................................................................................... 86
VREF, VBIAS ............................................................................................................................. 88
CRYSTAL OSCILLATOR ............................................................................................................ 88
LCD BOOST .............................................................................................................................. 90
LCD DRIVERS ........................................................................................................................... 90
71M6511/71M6511H
Single-Phase Energy Meter IC DATA SHEET
NOVEMBER 2010
A Maxim Integrated Products Brand RESETZ..................................................................................................................................... 90
COMPARATORS ....................................................................................................................... 90
RAM AND FLASH MEMORY ...................................................................................................... 91
FLASH MEMORY TIMING .......................................................................................................... 91
EEPROM INTERFACE ............................................................................................................... 91
Recommended External Components ....................................................................................................... 91
Packaging Information .............................................................................................................................. 92
Pinout (Top View) ....................................................................................................................... 93
Pin Descriptions ......................................................................................................................... 94
I/O Equivalent Circuits: ............................................................................................................... 96
ORDERING INFORMATION .................................................................................................................... 97
Figures Figure 1: IC Functional Block Diagram .......................................................................................................................... 7
Figure 2: General Topology of a Chopped Amplifier ..................................................................................................... 10
Figure 3: AFE Block Diagram...................................................................................................................................... 11
Figure 4: Samples in Multiplexer Cycle ....................................................................................................................... 13
Figure 5: Accumulation Interval.................................................................................................................................. 13
Figure 6: Memory Map .............................................................................................................................................. 15
Figure 7: Interrupt Structure ...................................................................................................................................... 36
Figure 8: DIO Ports Block Diagram ............................................................................................................................. 37
Figure 9: Oscillator Circuit ......................................................................................................................................... 40
Figure 10: LCD Voltage Boost Circuitry ....................................................................................................................... 41
Figure 11: Voltage Range for V1 ................................................................................................................................ 43
Figure 12: Voltage. Current, Momentary and Accumulated Energy................................................................................ 47
Figure 13: Timing Relationship between ADC MUX, CE, and Serial Transfers ................................................................ 48
Figure 14: RTM Output Format .................................................................................................................................. 49
Figure 15: SSI Timing, (SSI_FPOL = SSI_RDYPOL = 0) ............................................................................................ 49
Figure 16: SSI Timing, 16-bit Field Example (External Device Delays SRDY) ................................................................. 49
Figure 17: MPU/CE Data Flow .................................................................................................................................... 50
Figure 18: MPU/CE Communication (Functional) ......................................................................................................... 51
Figure 19: MPU/CE Communication (Processing Sequence) ........................................................................................ 51
Figure 20: Timing Diagram for Voltages, Current and Operation Modes after Power-Up ................................................. 52
Figure 21: Chop Polarity w/ Automatic Chopping ........................................................................................................ 54
Figure 22: Sequence with Alternate Multiplexer Cycles ................................................................................................ 54
Figure 23: Sequence with Alternate Multiplexer Cycles and Controlled Chopping ........................................................... 55
Figure 24: Wh Accuracy, 0.3A - 200A/240V ................................................................................................................ 75
Figure 25: VARh Accuracy for 0.3A to 200A/240V Performance ................................................................................... 75
Figure 27: Meter Accuracy over Harmonics at 240V, 30A ............................................................................................ 76
Figure 29: Resistive Voltage Divider (left), Current Transformer (right) ......................................................................... 77
Figure 30: Resistive Shunt (left), Rogowski Coil (right) ............................................................................................... 77
Figure 31: Crystal Frequency over Temperature .......................................................................................................... 78
Figure 32: Crystal Compensation ............................................................................................................................... 79
Figure 33: Connecting LCDs ...................................................................................................................................... 80
Figure 34: LCD Boost Circuit...................................................................................................................................... 81
Figure 35: EEPROM Connection ................................................................................................................................. 82
Figure 36: Interfacing RX to a 0-5V Signal .................................................................................................................. 82
Figure 37: Connection for Optical Components ........................................................................................................... 83
Figure 38: Voltage Divider for V1 ............................................................................................................................... 83
71M6511/71M6511H
Single-Phase Energy Meter IC DATA SHEET
NOVEMBER 2010
A Maxim Integrated Products Brand
Tables Table 1: Inputs Selected in Regular and Alternate Multiplexer Cycles .............................................................................. 8
Table 2: Channel control based on MUX_DIV and FIR_LEN ........................................................................................ 9
Table 3: CE DRAM Locations for ADC Results ............................................................................................................. 12
Table 4: Standard Meter Equations (inputs shown gray are scanned but not used for calculation) .................................. 12
Table 5: Stretch Memory Cycle Width......................................................................................................................... 16
Table 6: Internal Data Memory Map ........................................................................................................................... 17
Table 7: Special Function Registers Locations............................................................................................................. 17
Table 8: Special Function Registers Reset Values ........................................................................................................ 18
Table 9: PSW Register Flags ...................................................................................................................................... 19
Table 10: PSW bit functions ...................................................................................................................................... 19
Table 11: Port Registers ............................................................................................................................................ 20
Table 12: Special Function Registers .......................................................................................................................... 21
Table 13: Baud Rate Generation ................................................................................................................................. 22
Table 14: UART Modes .............................................................................................................................................. 22
Table 15: The S0CON Register ................................................................................................................................... 22
Table 16: The S1CON register .................................................................................................................................... 23
Table 17: The S0CON Bit Functions ............................................................................................................................ 23
Table 18: The S1CON Bit Functions ............................................................................................................................ 24
Table 19: The TMOD Register .................................................................................................................................... 24
Table 20: TMOD Register Bit Description .................................................................................................................... 25
Table 21: Timers/Counters Mode Description ............................................................................................................. 25
Table 22: The TCON Register ..................................................................................................................................... 25
Table 23: The TCON Register Bit Functions ................................................................................................................. 26
Table 24: Timer Modes .............................................................................................................................................. 26
Table 25: The PCON Register ..................................................................................................................................... 26
Table 26: The IEN0 Register (see also Table 34) ......................................................................................................... 27
Table 27: The IEN0 Bit Functions (see also Table 34)................................................................................................... 27
Table 28: The IEN1 Register (see also Tables 35/36) ................................................................................................... 27
Table 29: The IEN1 Bit Functions (see also Tables 35/36) ............................................................................................ 27
Table 30: The IP0 Register (see also Table 46)............................................................................................................ 28
Table 31: The IP0 bit Functions (see also Table 46) ..................................................................................................... 28
Table 32: The WDTREL Register ................................................................................................................................ 28
Table 33: The WDTREL Bit Functions ......................................................................................................................... 28
Table 34: The IEN0 Register ...................................................................................................................................... 29
Table 35: The IEN0 Bit Functions ............................................................................................................................... 30
Table 36: The IEN1 Register ...................................................................................................................................... 31
Table 37: The IEN1 Bit Functions ............................................................................................................................... 31
Table 38: The IEN2 Register ...................................................................................................................................... 31
Table 39: The IEN2 Bit Functions ............................................................................................................................... 31
Table 40: The TCON Register ..................................................................................................................................... 32
Table 41: The TCON Bit Functions .............................................................................................................................. 32
Table 42: The IRCON Register.................................................................................................................................... 32
Table 43: The IRCON Bit Functions............................................................................................................................. 32
Table 44: External MPU Interrupts ............................................................................................................................. 33
Table 45: Control Bits for External Interrupts .............................................................................................................. 33
Table 46: Priority Level Groups .................................................................................................................................. 34
Table 47: The IP0 Register:........................................................................................................................................ 34
