71M6541DSLASHFSLASHG datasheet(3/166 Pages) MAXIM

3 / 166 page

71M6541D/F/G and 71M6542F/G Data Sheet

Rev 5

3.3

Fault and Reset Behavior .......................................................................................................... 85

3.3.1

Events at Power-Down .................................................................................................. 85

3.3.2

IC Behavior at Low Battery Voltage............................................................................... 86

3.3.3

Reset Sequence ............................................................................................................ 86

3.3.4

Watchdog Timer Reset .................................................................................................. 86

3.4

Wake Up Behavior ..................................................................................................................... 87

3.4.1

Wake on Hardware Events ............................................................................................ 87

3.4.2

Wake on Timer............................................................................................................... 90

3.5

Data Flow and MPU/CE Communication................................................................................... 91

Application Information.................................................................................................................... 92

4.1

Connecting 5 V Devices............................................................................................................. 92

4.2

Direct Connection of Sensors .................................................................................................... 92

4.3

71M6541D/F/G Using Local Sensors ........................................................................................ 93

4.4

71M6541D/F/G Using 71M6x01and Current Shunts ................................................................. 94

4.5

71M6542F/G Using Local Sensors ............................................................................................ 95

4.6

71M6542F/G Using 71M6x01 and Current Shunts ................................................................... 96

4.7

Metrology Temperature Compensation ..................................................................................... 97

4.7.1

Voltage Reference Precision ......................................................................................... 97

4.7.2

Temperature Coefficients for the 71M654x ................................................................... 97

4.7.3

Temperature Compensation for VREF with Local Sensors........................................... 98

4.7.4

Temperature Compensation for VREF with Remote Sensor ........................................ 99

4.8

Connecting I

2C EEPROMs ...................................................................................................... 100

4.9

Connecting Three-Wire EEPROMs ......................................................................................... 101

4.10 UART0 (TX/RX) ....................................................................................................................... 101

4.11 Optical Interface (UART1)........................................................................................................ 101

4.12 Connecting the Reset Pin ........................................................................................................ 102

4.13 Connecting the Emulator Port Pins.......................................................................................... 103

4.14 Flash Programming.................................................................................................................. 104

4.14.1 Flash Programming via the ICE Port ........................................................................... 104

4.14.2 Flash Programming via the SPI Port ........................................................................... 104

4.15 MPU Firmware Library ............................................................................................................. 104

4.16 Crystal Oscillator ...................................................................................................................... 104

4.17 Meter Calibration...................................................................................................................... 104

Firmware Interface .......................................................................................................................... 105

5.1

I/O RAM Map –Functional Order ............................................................................................. 105

5.2

I/O RAM Map – Alphabetical Order ......................................................................................... 111

5.3

CE Interface Description .......................................................................................................... 126

5.3.1

CE Program ................................................................................................................. 126

5.3.2

CE Data Format ........................................................................................................... 126

5.3.3

Constants..................................................................................................................... 126

5.3.4

Environment................................................................................................................. 127

5.3.5

CE Calculations ........................................................................................................... 127

5.3.6

CE Front End Data (Raw Data) ................................................................................... 128

5.3.7

FCE Status and Control ............................................................................................... 128

5.3.8

CE Transfer Variables ................................................................................................. 131

5.3.9

Pulse Generation ......................................................................................................... 133

5.3.10 Other CE Parameters .................................................................................................. 135

5.3.11 CE Calibration Parameters .......................................................................................... 136

5.3.12 CE Flow Diagrams....................................................................................................... 137

71M6541D/F/G Datasheet(PDF) 3 Page - Maxim Integrated Products

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