Datasheet ADE7953 (Analog Devices) - 2

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ADE7953 Data Sheet TABLE OF CONTENTS
Features ...1 Period Measurement ... 36 General Description ..1 Instantaneous Powers and Waveform Sampling .. 37 Functional Block Diagram...1 Power Factor ... 38 Revision History ..3 Using the Line Cycle Accumulation Mode to Determine the Specifications ...4 Power Factor.. 38 Timing Characteristics...6 Power Factor with No-Load Detection .. 38 Absolute Maximum Ratings ..8 Angle Measurement... 39 ESD Caution ..8 No-Load Detection.. 40 Pin Configuration and Function Descriptions...9 Setting the No-Load Thresholds .. 40 Typical Performance Characteristics ...11 Active Energy No-Load Detection... 40 Test Circuit ..16 Reactive Energy No-Load Detection ... 41 Terminology ..17 Apparent Energy No-Load Detection .. 41 ADE7953 Power-Up Procedure ...18 Zero-Crossing Detection ... 43 Required Register Setting...18 Zero-Crossing Output Pins.. 43 Theory of Operation..19 Zero-Crossing Interrupts... 43 Analog Inputs ..19 Zero-Crossing Timeout ... 44 Analog-to-Digital Conversion ...19 Zero-Crossing Threshold... 44 Current Channel ADCs ...21 Voltage Sag Detection.. 45 Voltage Channel ADC..21 Setting the SAGCYC Register .. 45 Reference Circuit ...22 Setting the SAGLVL Register ... 45 Root Mean Square Measurement...23 Voltage Sag Interrupt ... 45 Current Channel RMS Calculation ..23 Peak Detection .. 46 Voltage Channel RMS Calculation ...23 Indication of Power Direction ... 47 Active Power Calculation...24 Reverse Power.. 47 Sign of Active Power Calculation ...25 Sign Indication .. 47 Active Energy Calculation..25 Overcurrent and Overvoltage Detection ... 48 Active Energy Accumulation Modes..27 Setting the OVLVL and OILVL Registers .. 48 Reactive Power Calculation ...28 Overvoltage and Overcurrent Interrupts ... 48 Sign of Reactive Power Calculation..28 Alternative Output Functions.. 49 Reactive Energy Calculation ..29 ADE7953 Interrupts .. 50 Reactive Energy Accumulation Modes ..30 Primary Interrupts (Voltage Channel and Current Channel A) .. 50 Apparent Power Calculation ..31 Current Channel B Interrupts.. 50 Apparent Energy Calculation...31 Communicating with the ADE7953 .. 51 Ampere-Hour Accumulation ...32 Communication Autodetection ... 51 Energy-to-Frequency Conversion..33 Locking the Communication Interface .. 51 Pulse Output Characteristics..33 SPI Interface .. 52 Energy Calibration...34 I2C Interface... 53 Gain Calibration ..34 UART Interface.. 55 Phase Calibration ...34 Communication Verification and Security .. 57 Offset Calibration ..35 Rev. C | Page 2 of 72 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM REVISION HISTORY SPECIFICATIONS TIMING CHARACTERISTICS SPI Interface Timing SPI Interface Timing Diagram I2C Interface Timing I2C Interface Timing Diagram ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT TERMINOLOGY ADE7953 POWER-UP PROCEDURE REQUIRED REGISTER SETTING THEORY OF OPERATION ANALOG INPUTS Current Channel A Current Channel B Voltage Channel ANALOG-TO-DIGITAL CONVERSION Oversampling Noise Shaping Antialiasing Filter CURRENT CHANNEL ADCS di/dt Current Sensor and Digital Integrator VOLTAGE CHANNEL ADC REFERENCE CIRCUIT ROOT MEAN SQUARE MEASUREMENT CURRENT CHANNEL RMS CALCULATION VOLTAGE CHANNEL RMS CALCULATION ACTIVE POWER CALCULATION SIGN OF ACTIVE POWER CALCULATION ACTIVE ENERGY CALCULATION Active Energy Integration Time Under Steady Load Active Energy Line Cycle Accumulation Mode ACTIVE ENERGY ACCUMULATION MODES Signed Accumulation Mode Positive-Only Accumulation Mode Absolute Accumulation Mode REACTIVE POWER CALCULATION SIGN OF REACTIVE POWER CALCULATION REACTIVE ENERGY CALCULATION Reactive Energy Integration Time Under Steady Load Reactive Energy Line Cycle Accumulation Mode REACTIVE ENERGY ACCUMULATION MODES Signed Accumulation Mode Antitamper Accumulation Mode Absolute Accumulation Mode APPARENT POWER CALCULATION APPARENT ENERGY CALCULATION Apparent Energy Integration Time Under Steady Load Apparent Energy Line Cycle Accumulation Mode AMPERE-HOUR ACCUMULATION ENERGY-TO-FREQUENCY CONVERSION PULSE OUTPUT CHARACTERISTICS ENERGY CALIBRATION GAIN CALIBRATION Current Channel Gain Adjustment PHASE CALIBRATION OFFSET CALIBRATION Power Offsets RMS Offsets PERIOD MEASUREMENT INSTANTANEOUS POWERS AND WAVEFORM SAMPLING POWER FACTOR USING THE LINE CYCLE ACCUMULATION MODE TO DETERMINE THE POWER FACTOR POWER FACTOR WITH NO-LOAD DETECTION ANGLE MEASUREMENT NO-LOAD DETECTION SETTING THE NO-LOAD THRESHOLDS ACTIVE ENERGY NO-LOAD DETECTION Active Energy No-Load Interrupt Active Energy No-Load Status Bits REACTIVE ENERGY NO-LOAD DETECTION Reactive Energy No-Load Interrupt Reactive Energy No-Load Status Bits APPARENT ENERGY NO-LOAD DETECTION Apparent Energy No-Load Interrupt Apparent Energy No-Load Status Bits ZERO-CROSSING DETECTION ZERO-CROSSING OUTPUT PINS Voltage Channel Zero Crossing Current Channel Zero Crossing ZERO-CROSSING INTERRUPTS ZERO-CROSSING TIMEOUT ZERO-CROSSING THRESHOLD VOLTAGE SAG DETECTION SETTING THE SAGCYC REGISTER SETTING THE SAGLVL REGISTER VOLTAGE SAG INTERRUPT PEAK DETECTION INDICATION OF POWER DIRECTION REVERSE POWER SIGN INDICATION OVERCURRENT AND OVERVOLTAGE DETECTION SETTING THE OVLVL AND OILVL REGISTERS OVERVOLTAGE AND OVERCURRENT INTERRUPTS ALTERNATIVE OUTPUT FUNCTIONS ADE7953 INTERRUPTS PRIMARY INTERRUPTS (VOLTAGE CHANNEL AND CURRENT CHANNEL A) CURRENT CHANNEL B INTERRUPTS COMMUNICATING WITH THE ADE7953 COMMUNICATION AUTODETECTION LOCKING THE COMMUNICATION INTERFACE SPI INTERFACE I2C INTERFACE I2C Write Operations I2C Read Operations UART INTERFACE UART Read UART Write COMMUNICATION VERIFICATION AND SECURITY WRITE PROTECTION COMMUNICATION VERIFICATION CHECKSUM REGISTER ADE7953 REGISTERS ADE7953 REGISTER DESCRIPTIONS Interrupt Enable and Interrupt Status Registers Current Channel A and Voltage Channel Registers Current Channel B Registers LAYOUT GUIDELINES OUTLINE DIMENSIONS ORDERING GUIDE