71M6531D Datasheet, PDF (3/115 Pages) Teridian Semiconductor Corporation – Energy Meter IC

FDS 6531/6532 005
Data Sheet 71M6531D/F-71M6532D/F
2 Functional Description ..................................................................................................................... 53
2.1 Theory of Operation ................................................................................................................... 53
2.2 System Timing Summary........................................................................................................... 54
2.3 Battery Modes ............................................................................................................................ 54
2.3.1 BROWNOUT Mode ....................................................................................................... 56
2.3.2 LCD Mode...................................................................................................................... 57
2.3.3 SLEEP Mode ................................................................................................................. 57
2.4 Fault and Reset Behavior .......................................................................................................... 59
2.4.1 Reset Mode.................................................................................................................... 59
2.4.2 Power Fault Circuit ........................................................................................................ 59
2.5 Wake-Up Behavior..................................................................................................................... 60
2.5.1 Wake on PB ................................................................................................................... 60
2.5.2 Wake on Timer............................................................................................................... 60
2.6 Data Flow ................................................................................................................................... 60
2.7 CE/MPU Communication ........................................................................................................... 61
3 Application Information.................................................................................................................... 62
3.1 Connection of Sensors............................................................................................................... 62
3.2 Connecting 5-V Devices ............................................................................................................ 62
3.3 Temperature Measurement ....................................................................................................... 63
3.4 Temperature Compensation ...................................................................................................... 63
3.4.1 Temperature Coefficients: ............................................................................................. 63
3.4.2 Temperature Compensation for VREF .......................................................................... 63
3.4.3 System Temperature Compensation ............................................................................. 63
3.4.4 Temperature Compensation for the RTC ...................................................................... 63
3.5 Connecting LCDs....................................................................................................................... 64
3.6 Connecting I²C EEPROMs ........................................................................................................ 64
3.7 Connecting Three-Wire EEPROMs ........................................................................................... 65
3.8 UART0 (TX/RX) ......................................................................................................................... 65
3.9 Optical Interface (UART1).......................................................................................................... 66
3.10 Connecting V1 and Reset Pins .................................................................................................. 67
3.11 Connecting the Emulator Port Pins............................................................................................ 67
3.12 Connecting a Battery ................................................................................................................. 68
3.13 Flash Programming.................................................................................................................... 68
3.14 MPU Firmware Library ............................................................................................................... 69
3.15 Crystal Oscillator ........................................................................................................................ 69
3.16 Meter Calibration........................................................................................................................ 69
4 Firmware Interface ............................................................................................................................ 70
4.1 I/O RAM and SFR Map – Functional Order ............................................................................... 70
4.2 I/O RAM Description – Alphabetical Order ................................................................................ 75
4.3 CE Interface Description ............................................................................................................ 86
4.3.1 CE Program ................................................................................................................... 86
4.3.2 CE Data Format ............................................................................................................. 86
4.3.3 Constants....................................................................................................................... 86
4.3.4 Environment................................................................................................................... 86
4.3.5 CE Calculations ............................................................................................................. 87
4.3.6 CE Status and Control ................................................................................................... 87
4.3.7 CE Transfer Variables ................................................................................................... 89
4.3.8 Pulse Generation ........................................................................................................... 91
4.3.9 CE Calibration Parameters ............................................................................................ 92
4.3.10 Other CE Parameters .................................................................................................... 93
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