71M6543F/H and 71M6543G/GH Data Sheet
3.1 Theory of Operation..............................................................................................................75
3.2 Battery Modes.......................................................................................................................75
3.2.1 BRN Mode ................................................................................................................78
3.2.2 LCD Mode.................................................................................................................78
3.2.3 SLP Mode.................................................................................................................79
3.3 Fault and Reset Behavior......................................................................................................80
3.3.1 Events at Power-Down ..............................................................................................80
3.3.2 IC Behavior at Low Battery Voltage ...........................................................................81
3.3.3 Reset Sequence........................................................................................................81
3.3.4 Watchdog Timer (WDT) Reset...................................................................................81
3.4 Wake-Up Behavior................................................................................................................82
3.4.1 Wake on Hardware Events........................................................................................82
3.4.2 Wake on Timer..........................................................................................................84
3.5 Data Flow and MPU/CE Communication...............................................................................84
Application Information...............................................................................................................86
4.1 Connecting 5 V Devices........................................................................................................86
4.2 Directly Connected Sensors..................................................................................................86
4.3 Systems Using 71M6xx3 Isolated Sensors and Current Shunts.............................................87
4.4 System Using Current Transformers .....................................................................................88
4.5 Metrology Temperature Compensation..................................................................................89
4.5.1 Distinction Between Standard and High-Precision Parts ............................................89
4.5.2 Temperature Coefficients for the 71M6543F and 71M6543G .....................................90
4.5.3 Temperature Coefficients for the 71M6543H and 71M6543GH ..................................90
4.5.4 Temperature Coefficients for the 71M6xx3.................................................................90
4.5.5 Temperature Compensation for VREF and Shunt Sensors ........................................90
4.5.6 Temperature Compensation of VREF and Current Transformers...............................92
4.6 Connecting I2C EEPROMs....................................................................................................94
4.7 Connecting Three-Wire EEPROMs .......................................................................................94
4.8 UART0 (TX/RX) ....................................................................................................................94
4.9 Optical Interface (UART1).....................................................................................................94
4.10 Connecting the Reset Pin......................................................................................................95
4.11 Connecting the Emulator Port Pins........................................................................................96
4.12 Flash Programming...............................................................................................................96
4.12.1 Flash Programming via the ICE Port..........................................................................96
4.12.2 Flash Programming via the SPI Port..........................................................................96
4.13 MPU Demonstration Code.....................................................................................................96
4.14 Crystal Oscillator...................................................................................................................97
4.15 Meter Calibration...................................................................................................................97
Firmware Interface.......................................................................................................................98
5.1 I/O RAM Map –Functional Order ...........................................................................................98
5.2 I/O RAM Map – Alphabetical Order .....................................................................................104
5.3 Reading the Info Page (71M6543H and 71M6543GH only)..................................................118
5.4 CE Interface Description .....................................................................................................120
5.4.1 CE Program ............................................................................................................120
5.4.2 CE Data Format ......................................................................................................120
5.4.3 Constants................................................................................................................120
5.4.4 Environment............................................................................................................121
5.4.5 CE Calculations.......................................................................................................121
5.4.6 CE Front-End Data (Raw Data) ...............................................................................122
5.4.7 CE Status and Control.............................................................................................123
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