71M6543F Datasheet, PDF (3/157 Pages) Maxim Integrated Products – Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation

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
4 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
5 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
5.4.2
5.4.3
5.4.4
5.4.5
5.4.6
5.4.7
CE Program ............................................................................................................ 120
CE Data Format ...................................................................................................... 120
Constants................................................................................................................ 120
Environment............................................................................................................ 121
CE Calculations....................................................................................................... 121
CE Front-End Data (Raw Data) ............................................................................... 122
CE Status and Control............................................................................................. 123
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