Datasheet

71M6543F/71M6543G Data Sheet
v2 3
3.2.2 LCD Mode ...................................................................................................................... 77
3.2.3 SLP Mode ...................................................................................................................... 78
3.3 Fault and Reset Behavior .......................................................................................................... 79
3.3.1 Events at Power-Down .................................................................................................. 79
3.3.2 IC Behavior at Low Battery Voltage ............................................................................... 80
3.3.3 Reset Sequence ............................................................................................................ 80
3.3.4 Watchdog Timer (WDT) Reset ...................................................................................... 80
3.4 Wake-Up Behavior ..................................................................................................................... 81
3.4.1 Wake on Hardware Events ............................................................................................ 81
3.4.2 Wake on Timer............................................................................................................... 83
3.5 Data Flow and MPU/CE Communication ................................................................................... 83
4 Application Information .................................................................................................................... 85
4.1 Connecting 5 V Devices ............................................................................................................. 85
4.2 Directly Connected Sensors ...................................................................................................... 85
4.3 Systems Using 71M6xx3 Isolated Sensors and Current Shunts ............................................... 86
4.4 System Using Current Transformers ......................................................................................... 87
4.5 Metrology Temperature Compensation ..................................................................................... 88
4.5.1 Temperature Compensation .......................................................................................... 88
4.5.2 Temperature Coefficients for the 71M6543F and 71M6543G ....................................... 88
4.5.3 Temperature Coefficients for the 71M6xx3 ................................................................... 89
4.5.4 Temperature Compensation for VREF and Shunt Sensors .......................................... 89
4.5.5 Temperature Compensation of VREF and Current Transformers ................................. 90
4.6 Connecting I
2
C EEPROMs ........................................................................................................ 92
4.7 Connecting Three-Wire EEPROMs ........................................................................................... 92
4.8 UART0 (TX/RX) ......................................................................................................................... 92
4.9 Optical Interface (UART1).......................................................................................................... 93
4.10 Connecting the Reset Pin .......................................................................................................... 93
4.11 Connecting the Emulator Port Pins ............................................................................................ 94
4.12 Flash Programming .................................................................................................................... 94
4.12.1 Flash Programming via the ICE Port ............................................................................. 94
4.12.2 Flash Programming via the SPI Port ............................................................................. 94
4.13 MPU Demonstration Code ......................................................................................................... 94
4.14 Crystal Oscillator ........................................................................................................................ 95
4.15 Meter Calibration ........................................................................................................................ 95
5 Firmware Interface ............................................................................................................................ 96
5.1 I/O RAM Map –Functional Order ............................................................................................... 96
5.2 I/O RAM Map – Alphabetical Order ......................................................................................... 102
5.3 CE Interface Description .......................................................................................................... 116
5.3.1 CE Program ................................................................................................................. 116
5.3.2 CE Data Format ........................................................................................................... 116
5.3.3 Constants ..................................................................................................................... 116
5.3.4 Environment ................................................................................................................. 117
5.3.5 CE Calculations ........................................................................................................... 117
5.3.6 CE Front-End Data (Raw Data) ................................................................................... 118
5.3.7 CE Status and Control ................................................................................................. 119
5.3.8 CE Transfer Variables ................................................................................................. 121
5.3.9 Pulse Generation ......................................................................................................... 123
5.3.10 CE Calibration Parameters .......................................................................................... 127
5.3.11 CE Flow Diagrams ....................................................................................................... 128