Datasheet ADE7754 (Analog Devices) - 2

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ADE7754 Contents
ENERGIES SCALING . 27 GENERAL DESCRIPTION . 1 CHECK SUM REGISTER . 27 FEATURES . 1 SERIAL INTERFACE . 28 SPECIFICATIONS . 3 Serial Write Operation . 28 TIMING CHARACTERISTICS . 4 Serial Read Operation . 29 ABSOLUTE MAXIMUM RATINGS . 5 INTERRUPTS . 30 ORDERING GUIDE . 5 Using Interrupts with an MCU . 30 PIN CONFIGURATION . 5 Interrupt Timing . 30 PIN FUNCTION DESCRIPTIONS . 5 ACCESSING THE ADE7754 ON-CHIP REGISTERS . 31 TYPICAL PERFORMANCE CHARACTERISTICS . 7 Communications Register . 31 TERMINOLOGY . 9 Operational Mode Register (0Ah) . 35 Measurement Error . 9 Gain Register (18h) . 36 Phase Error Between Channels . 9 CFNUM Register (25h) . 36 Power Supply Rejection . 9 Measurement Mode Register (0Bh) . 37 ADC Offset Error . 9 Waveform Mode Register (0Ch) . 37 Gain Error . 9 Watt Mode Register (0Dh) . 38 Gain Error Match . 9 VA Mode Register (0Eh) . 38 POWER SUPPLY MONITOR . 9 Interrupt Enable Register(0Fh) . 39 ANALOG INPUTS . 9 Interrupt Status Register (10h)/Reset Interrupt Status ANALOG-TO-DIGITAL CONVERSION . 10 Register (11h) . 40 Antialias Filter . 10 OUTLINE DIMENSIONS . 41 CURRENT CHANNEL ADC . 11 Current Channel ADC Gain Adjust . 11 Current Channel Sampling . 11 VOLTAGE CHANNEL ADC . 12 ZERO-CROSSING DETECTION . 12 Zero-Crossing Timeout . 13 PERIOD MEASUREMENT . 13 LINE VOLTAGE SAG DETECTION . 13 PEAK DETECTION . 13 Peak Level Set . 14 TEMPERATURE MEASUREMENT . 14 PHASE COMPENSATION . 14 ROOT MEAN SQUARE MEASUREMENT . 15 Current RMS Calculation . 15 Current RMS Gain Adjust . 16 Current RMS Offset Compensation . 16 Voltage RMS Calculation . 16 Voltage RMS Gain Adjust . 16 Voltage RMS Offset Compensation . 17 ACTIVE POWER CALCULATION . 17 Power Offset Calibration . 18 Reverse Power Information . 18 TOTAL ACTIVE POWER CALCULATION . 18 ENERGY CALCULATION . 19 Integration Times Under Steady Load . 20 Energy to Frequency Conversion . 20 No Load Threshold . 21 Mode Selection of the Sum of the Three Active Energies . 22 LINE ENERGY ACCUMULATION . 22 REACTIVE POWER CALCULATION . 23 TOTAL REACTIVE POWER CALCULATION . 24 Reactive Energy Accumulation Selection . 24 APPARENT POWER CALCULATION . 24 Apparent Power Offset Calibration . 25 TOTAL APPARENT POWER CALCULATION . 25 APPARENT ENERGY CALCULATION . 26 Integration Times under Steady Load . 26 LINE APPARENT ENERGY ACCUMULATION . 26 –2– REV. 0 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM SPECIFICATIONS TIMING CHARACTERISTICS ABSOLUTE MAXIMUM RATINGS ORDERING GUIDE PIN CONFIGURATION PIN FUNCTION DESCRIPTIONS Typical Performance Characteristics TERMINOLOGY Measurement Error Phase Error Between Channels Power Supply Rejection ADC Offset Error Gain Error Gain Error Match POWER SUPPLY MONITOR ANALOG INPUTS ANALOG-TO-DIGITAL CONVERSION Antialias Filter CURRENT CHANNEL ADC Current Channel ADC Gain Adjust Current Channel Sampling VOLTAGE CHANNEL ADC ZERO-CROSSING DETECTION Zero-Crossing Timeout PERIOD MEASUREMENT LINE VOLTAGE SAG DETECTION SAG Level Set PEAK DETECTION Peak Level Set TEMPERATURE MEASUREMENT PHASE COMPENSATION ROOT MEAN SQUARE MEASUREMENT Current RMS Calculation Current RMS Gain Adjust Current RMS Offset Compensation Voltage RMS Calculation Voltage RMS Gain Adjust Voltage RMS Offset Compensation ACTIVE POWER CALCULATION Power Offset Calibration Reverse Power Information TOTAL ACTIVE POWER CALCULATION ENERGY CALCULATION Integration Times Under Steady Load Energy to Frequency Conversion No Load Threshold Mode Selection of the Sum of the Three Active Energies LINE ENERGY ACCUMULATION REACTIVE POWER CALCULATION TOTAL REACTIVE POWER CALCULATION Reactive Energy Accumulation Selection APPARENT POWER CALCULATION Apparent Power Offset Calibration TOTAL APPARENT POWER CALCULATION APPARENT ENERGY CALCULATION Integration Times under Steady Load LINE APPARENT ENERGY ACCUMULATION ENERGIES SCALING CHECK SUM REGISTER SERIAL INTERFACE Serial Write Operation Serial Read Operation INTERRUPTS Using Interrupts with an MCU Interrupt Timing ACCESSING THE ADE7754 ON-CHIP REGISTERS Communications Register Operational Mode Register (0Ah) Gain Register (18h) CFNUM Register (25h) Measurement Mode Register (0Bh) Waveform Mode Register (0Ch) Watt Mode Register (0Dh) VA Mode Register (0Eh) Interrupt Enable Register (0Fh) Interrupt Status Register (10h)/Reset Interrupt Status Register (11h) OUTLINE DIMENSIONS