Datasheet ADE7854, ADE7858, ADE7868, ADE7878 (Analog Devices) - 2

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ADE7854/ADE7858/ADE7868/ADE7878 Data Sheet TABLE OF CONTENTS
Features .. 1 Power Quality Measurements ... 34 Applications ... 1 Phase Compensation ... 39 General Description ... 1 Reference Circuit .. 41 Revision History ... 3 Digital Signal Processor ... 42 Functional Block Diagrams ... 5 Root Mean Square Measurement ... 43 Specifications ... 9 Active Power Calculation .. 47 Timing Characteristics .. 12 Reactive Power Calculation—ADE7858, ADE7868, ADE7878 Absolute Maximum Ratings .. 15 Only .. 52 Thermal Resistance .. 15 Apparent Power Calculation ... 57 ESD Caution .. 15 Waveform Sampling Mode ... 60 Pin Configuration and Function Descriptions ... 16 Energy-to-Frequency Conversion.. 60 Typical Performance Characteristics ... 18 No Load Condition .. 64 Test Circuit .. 21 Checksum Register... 65 Terminology .. 22 Interrupts ... 66 Power Management .. 23 Serial Interfaces .. 68 PSM0—Normal Power Mode (All Parts) .. 23 Quick Setup as Energy Meter ... 75 PSM1—Reduced Power Mode (ADE7868, ADE7878 Only) 23 Layout Guidelines... 75 PSM2—Low Power Mode (ADE7868, ADE7878 Only) ... 23 Crystal Circuit .. 76 PSM3—Sleep Mode (All Parts) .. 24 ADE7878 Evaluation Board .. 76 Power-Up Procedure .. 26 Die Version .. 76 Hardware Reset ... 27 Silicon Anomaly ... 77 Software Reset Functionality .. 27 ADE7854/ADE7858/ADE7868/ADE7878 Functionality Issues .. 77 Theory of Operation .. 28 Functionality Issues .. 77 Analog Inputs .. 28 Section 1. ADE7854/ADE7858/ADE7868/ADE7878 Analog-to-Digital Conversion .. 28 Functionality Issues .. 79 Current Channel ADC... 29 Registers List ... 80 di/dt Current Sensor and Digital Integrator .. 31 Outline Dimensions ... 98 Voltage Channel ADC ... 32 Ordering Guide .. 98 Changing Phase Voltage Datapath ... 33 Rev. H | Page 2 of 100 Document Outline Features Applications General Description Table of Contents Revision History Functional Block Diagrams Specifications Timing Characteristics Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Test Circuit Terminology Power Management PSM0—Normal Power Mode (All Parts) PSM1—Reduced Power Mode (ADE7868, ADE7878 Only) PSM2—Low Power Mode (ADE7868, ADE7878 Only) PSM3—Sleep Mode (All Parts) Power-Up Procedure Hardcore Reset Software Reset Functionality Theory of Operation Analog Inputs Analog-to-Digital Conversion Antialiasing Filter ADC Transfer Function Current Channel ADC Current Waveform Gain Registers Current Channel HPF Current Channel Sampling di/dt Current Sensor and Digital Integrator Voltage Channel ADC Voltage Waveform Gain Registers Voltage Channel HPF Voltage Channel Sampling Changing Phase Voltage Datapath POWER QUALITY MEASUREMENTS Zero-Crossing Detection Zero-Crossing Timeout Phase Sequence Detection Time Interval Between Phases Period Measurement Phase Voltage Sag Detection SAG Level Set Peak Detection Overvoltage and Overcurrent Detection Overvoltage and Overcurrent Level Set Neutral Current Mismatch—ADE7868, ADE7878 Phase Compensation Reference Circuit Digital Signal Processor Root Mean Square Measurement Current RMS Calculation Current RMS Offset Compensation Current Mean Absolute Value Calculation—ADE7868 and ADE7878 Only Current MAV Gain and Offset Compensation Voltage Channel RMS Calculation Voltage RMS Offset Compensation Active Power Calculation Total Active Power Calculation Fundamental Active Power Calculation—ADE7878 Only Active Power Gain Calibration Active Power Offset Calibration Sign of Active Power Calculation Active Energy Calculation Integration Time Under Steady Load Energy Accumulation Modes Line Cycle Active Energy Accumulation Mode Reactive Power Calculation—ADE7858, ADE7868, ADE7878 Only Reactive Power Gain Calibration Reactive Power Offset Calibration Sign of Reactive Power Calculation Reactive Energy Calculation Integration Time Under A Steady Load Energy Accumulation Modes Line Cycle Reactive Energy Accumulation Mode Apparent Power Calculation Apparent Power Gain Calibration Apparent Power Offset Calibration Apparent Power Calculation Using VNOM Apparent Energy Calculation Integration Time Under Steady Load Energy Accumulation Mode Line Cycle Apparent Energy Accumulation Mode Waveform Sampling Mode Energy-to-Frequency Conversion Synchronizing Energy Registers with CFx Outputs CF Outputs for Various Accumulation Modes Sign of Sum-of-Phase Powers in the CFx Datapath No Load Condition No Load Detection Based On Total Active, Reactive Powers No Load Detection Based on Fundamental Active and Reactive Powers—ADE7878 Only No Load Detection Based on Apparent Power Checksum Register Interrupts Using the Interrupts with an MCU Serial Interfaces Serial Interface Choice I2C-Compatible Interface I2C Write Operation I2C Read Operation SPI-Compatible Interface SPI Read Operation SPI Write Operation HSDC Interface Quick Setup as Energy Meter Layout Guidelines Crystal Circuit ADE7878 Evaluation Board Die Version Silicon Anomaly ADE7854/ADE7858/ADE7868/ADE7878 Functionality Issues Functionality Issues SECTION 1. ADE7854/ADE7858/ADE7868/ADE7878 Functionality Issues Registers List Outline Dimensions Ordering Guide