71M6511/71M6511H
Single-Phase Energy Meter IC
DATA SHEET
AUGUST 2007
SPECIFICATIONS ....................................................................................................................................................... 83
Electrical Specifications ................................................................................................................................. 83
LOGIC LEVELS............................................................................................................................... 84
VREF, VBIAS .................................................................................................................................. 86
CRYSTAL OSCILLATOR ................................................................................................................ 86
LCD BOOST.................................................................................................................................... 88
LCD DRIVERS ................................................................................................................................ 88
RTC................................................................................................................................................. 88
RESETZ .......................................................................................................................................... 88
COMPARATORS ............................................................................................................................ 88
RAM AND FLASH MEMORY .......................................................................................................... 89
FLASH MEMORY TIMING .............................................................................................................. 89
EEPROM INTERFACE.................................................................................................................... 89
Recommended External Components ........................................................................................................... 89
Packaging Information ................................................................................................................................... 90
Pinout (Top View)............................................................................................................................ 91
Pin Descriptions............................................................................................................................... 92
I/O Equivalent Circuits:.................................................................................................................... 94
ORDERING INFORMATION ......................................................................................................................... 95
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...........................................................................................................................35
Figure 8: DIO Ports Block Diagram................................................................................................................36
Figure 9: Oscillator Circuit..............................................................................................................................39
Figure 10: LCD Voltage Boost Circuitry .........................................................................................................40
Figure 11: Voltage Range for V1....................................................................................................................42
Figure 12: Voltage. Current, Momentary and Accumulated Energy...............................................................46
Figure 13: Timing Relationship between ADC MUX, CE, and Serial Transfers .............................................47
Figure 14: RTM Output Format......................................................................................................................48
Figure 15: SSI Timing, (SSI_FPOL = SSI_RDYPOL = 0) ..............................................................................48
Figure 16: SSI Timing, 16-bit Field Example (External Device Delays SRDY)...............................................48
Figure 17: MPU/CE Data Flow.......................................................................................................................49
Figure 18: MPU/CE Communication (Functional) ..........................................................................................50
Figure 19: MPU/CE Communication (Processing Sequence)........................................................................50
Figure 20: Timing Diagram for Voltages, Current and Operation Modes after Power-Up ..............................51
Figure 21: Chop Polarity w/ Automatic Chopping...........................................................................................53
Figure 22: Sequence with Alternate Multiplexer Cycles .................................................................................53
Figure 23: Sequence with Alternate Multiplexer Cycles and Controlled Chopping.........................................54
Figure 24: Wh Accuracy, 0.3A - 200A/240V ..................................................................................................74
Figure 25: VARh Accuracy for 0.3A to 200A/240V Performance ...................................................................74
Figure 26: 71M6511H Wh Accuracy over Current at Various Temperatures .................................................74
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