71M6541D Maxim, 71M6541D Datasheet - Page 3

• Manufacturer Part Number: 71M6541D
• Description: The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are Teridian™ 4th-generation single-phase metering SoCs with a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver
• Manufacturer: Maxim

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Rev 2
3.3
3.4
3.5
Application Information ............................................................................................................... 92
4.1
4.2
4.3
4.4
4.5
4.6
4.7
4.8
4.9
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 ...................................................................................... 102
4.14 Flash Programming ............................................................................................................. 104
4.15 MPU Firmware Library ........................................................................................................ 104
4.16 Crystal Oscillator ................................................................................................................. 104
4.17 Meter Calibration ................................................................................................................. 104
Firmware Interface ..................................................................................................................... 105
5.1
5.2
5.3
Electrical Specifications ............................................................................................................ 138
Fault and Reset Behavior ...................................................................................................... 85
Wake Up Behavior ................................................................................................................ 87
Data Flow and MPU/CE Communication ............................................................................... 91
Connecting 5 V Devices ........................................................................................................ 92
Direct Connection of Sensors ................................................................................................ 92
71M6541D/F/G Using Local Sensors..................................................................................... 93
71M6541D/F/G Using 71M6x01and Current Shunts .............................................................. 94
71M6542F/G Using Local Sensors ........................................................................................ 95
71M6542F/G Using 71M6x01 and Current Shunts ................................................................. 96
Metrology Temperature Compensation .................................................................................. 97
Connecting I
Connecting Three-Wire EEPROMs ..................................................................................... 101
I/O RAM Map –Functional Order ......................................................................................... 105
I/O RAM Map – Alphabetical Order ..................................................................................... 111
CE Interface Description ..................................................................................................... 125
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
3.4.1 Wake on Hardware Events ........................................................................................ 87
3.4.2 Wake on Timer .......................................................................................................... 90
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
4.14.1 Flash Programming via the ICE Port ........................................................................ 104
4.14.2 Flash Programming via the SPI Port ........................................................................ 104
5.3.1 CE Program ............................................................................................................ 125
5.3.2 CE Data Format ...................................................................................................... 125
5.3.3 Constants ................................................................................................................ 125
5.3.4 Environment ............................................................................................................ 126
5.3.5 CE Calculations ....................................................................................................... 126
5.3.6 CE Front End Data (Raw Data)................................................................................ 127
5.3.7 FCE Status and Control ........................................................................................... 127
5.3.8 CE Transfer Variables ............................................................................................. 129
5.3.9 Pulse Generation..................................................................................................... 132
5.3.10 Other CE Parameters .............................................................................................. 134
5.3.11 CE Calibration Parameters ...................................................................................... 135
5.3.12 CE Flow Diagrams .................................................................................................. 136
2
C EEPROMs .................................................................................................. 100
71M6541D/F/G and 71M6542F/G Data Sheet
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