71M6543H datasheet(3/157 Pages) MAXIM

3 / 157 page

71M6543F/H and 71M6543G/GH Data Sheet

v1.2

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

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

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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