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71M6543F Datasheet(PDF) 3 Page - Maxim Integrated Products

Part # 71M6543F
Description  Selectable Gain of 1 or 8 for One Current Energy Meter ICs Metrology Compensation
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

71M6543F Datasheet(HTML) 3 Page - Maxim Integrated Products

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71M6543F/H and 71M6543G/GH Data Sheet
v1.2
© 2008–2011 Teridian Semiconductor Corporation
3
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 I
2C 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 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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