71M6545 Datasheet, PDF (3/134 Pages) Maxim Integrated Products – Four-Quadrant Metering, Phase Metrology Processors Flash/RAM Size

PDS_6545_009
Data Sheet 71M6545/H
3.1 Theory of Operation .............................................................................................................. 66
3.2 SLP Mode (Sleep Mode) ....................................................................................................... 67
3.3 Fault and Reset Behavior...................................................................................................... 68
3.3.1 Events at Power-Down .............................................................................................. 68
3.3.2 Reset Sequence........................................................................................................ 69
3.4 Data Flow and Host Communication ..................................................................................... 69
4 Application Information............................................................................................................... 71
4.1 Connecting 5 V Devices........................................................................................................ 71
4.2 Directly Connected Sensors .................................................................................................. 71
4.3 Systems Using 71M6xx3 Isolated Sensors and Current Shunts ............................................. 72
4.4 System Using Current Transformers ..................................................................................... 73
4.5 Metrology Temperature Compensation.................................................................................. 74
4.5.1 Distinction Between Standard and High-Precision Parts ............................................ 74
4.5.2 Temperature Coefficients for the 71M6545 ................................................................ 75
4.5.3 Temperature Coefficients for the 71M6545H.............................................................. 75
4.5.4 Temperature Coefficients for the 71M6603 and 71M6103 (1% Energy Accuracy) ...... 75
4.5.5 Temperature Compensation for VREF and Shunt Sensors ........................................ 75
4.5.6 Temperature Compensation of VREF and Current Transformers ............................... 77
4.6 Connecting I²C EEPROMs .................................................................................................... 79
4.7 Connecting Three-Wire EEPROMs ....................................................................................... 79
4.8 UART (TX/RX) ...................................................................................................................... 79
4.9 Connecting the Reset Pin...................................................................................................... 79
4.10 Connecting the Emulator Port Pins........................................................................................ 80
4.11 Flash Programming............................................................................................................... 80
4.11.1 Flash Programming via the ICE Port.......................................................................... 80
4.11.2 Flash Programming via the SPI Port .......................................................................... 80
4.12 MPU Demonstration Code..................................................................................................... 81
4.13 Crystal Oscillator................................................................................................................... 81
4.14 Meter Calibration................................................................................................................... 81
5 Firmware Interface....................................................................................................................... 82
5.1 I/O RAM Map –Functional Order ........................................................................................... 82
5.2 I/O RAM Map – Alphabetical Order ....................................................................................... 88
5.3 Reading the Info Page (71M6545H only)............................................................................... 98
5.4 CE Interface Description ..................................................................................................... 100
5.4.1 CE Program ............................................................................................................ 100
5.4.2 CE Data Format ...................................................................................................... 100
5.4.3 Constants................................................................................................................ 100
5.4.4 Environment............................................................................................................ 101
5.4.5 CE Calculations....................................................................................................... 101
5.4.6 CE Front End Data (Raw Data)................................................................................ 102
5.4.7 CE Status and Control............................................................................................. 103
5.4.8 CE Transfer Variables ............................................................................................. 105
5.4.9 Pulse Generation..................................................................................................... 107
5.4.10 CE Calibration Parameters ...................................................................................... 110
5.4.11 CE Flow Diagrams .................................................................................................. 111
6 71M6545/H Specifications ......................................................................................................... 113
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