71M6521DE Datasheet, PDF (3/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
Hardware Watchdog Timer............................................................................................ 46
Program Security........................................................................................................... 46
Test Ports ...................................................................................................................... 47
FUNCTIONAL DESCRIPTION................................................................................................................... 48
Theory of Operation ..................................................................................................................... 48
System Timing Summary............................................................................................................. 49
Battery Modes.............................................................................................................................. 50
MISSION...................................................................................................................................... 51
BROWNOUT Mode ....................................................................................................... 51
LCD Mode ..................................................................................................................... 52
SLEEP Mode ................................................................................................................. 52
Fault and Reset Behavior ............................................................................................................ 57
Wake Up Behavior ....................................................................................................................... 57
Wake on PB................................................................................................................... 58
Wake on Timer .............................................................................................................. 58
Data Flow..................................................................................................................................... 59
CE/MPU Communication ............................................................................................................. 59
APPLICATION INFORMATION ................................................................................................................. 60
Connection of Sensors (CT, Resistive Shunt).............................................................................. 60
Distinction between 71M6521DE/71M6521FE and 71M6521DH Parts ....................................... 60
Temperature Measurement ......................................................................................................... 61
Temperature Compensation ........................................................................................................ 61
Temperature Compensation and Mains Frequency Stabilization for the RTC ............................. 64
Connecting 5 V Devices............................................................................................................... 65
Connecting LCDs......................................................................................................................... 66
Connecting I²C EEPROMs .......................................................................................................... 68
Connecting Three-Wire EEPROMs ............................................................................................. 69
UART0 (TX/RX) ........................................................................................................................... 69
Optical Interface........................................................................................................................... 70
Connecting V1 and Reset Pins .................................................................................................... 70
Connecting the Emulator Port Pins .............................................................................................. 71
Crystal Oscillator.......................................................................................................................... 71
Flash Programming ..................................................................................................................... 72
MPU Firmware Library ................................................................................................................. 72
Meter Calibration ......................................................................................................................... 72
FIRMWARE INTERFACE .......................................................................................................................... 73
I/O RAM MAP – In Numerical Order ............................................................................................ 73
SFR MAP (SFRs Specific to the Teridian 80515) – In Numerical Order ...................................... 74
I/O RAM DESCRIPTION – Alphabetical Order ............................................................................ 75
CE Interface Description .............................................................................................................. 82
CE Program................................................................................................................... 82
Rev 2
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