ADE7878 datasheet(2/92 Pages) AD

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ADE7878

Rev. 0 | Page 2 of 92

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 3

Functional Block Diagram .............................................................. 4

Specifications..................................................................................... 5

Timing Characteristics ................................................................ 8

Absolute Maximum Ratings.......................................................... 11

Thermal Resistance .................................................................... 11

ESD Caution................................................................................ 11

Pin Configuration and Function Descriptions........................... 12

Typical Performance Characteristics ........................................... 14

Test Circuit ...................................................................................... 17

Terminology .................................................................................... 18

Power Management........................................................................ 19

PSM0—Normal Power Mode ................................................... 19

PSM1—Reduced Power Mode.................................................. 19

PSM2—Low Power Mode ......................................................... 19

PSM3—Sleep Mode.................................................................... 20

Power-Up Procedure.................................................................. 20

Hardware Reset........................................................................... 21

Software Reset Functionality .................................................... 21

Theory of Operation ...................................................................... 24

Analog Inputs.............................................................................. 24

Analog-to-Digital Conversion.................................................. 24

Antialiasing Filter................................................................... 25

ADC Transfer Function......................................................... 25

Current Channel ADC............................................................... 25

Current Waveform Gain Registers....................................... 26

Current Channel HPF ........................................................... 26

Current Channel Sampling ................................................... 27

di/dt Curent Sensor and Digital Integrator ............................. 27

Voltage Channel ADC................................................................ 28

Voltage Waveform Gain Registers........................................ 28

Voltage Channel HPF ............................................................ 28

Voltage Channel Sampling .................................................... 28

Changing Phase Voltage Datapath ........................................... 29

Power Quality Measurements................................................... 29

Zero Crossing Detection ....................................................... 29

Zero-Crossing Timeout......................................................... 30

Phase Sequence Detection .................................................... 30

Time Interval Between Phases ............................................. 31

Period Measurement.............................................................. 32

Phase Voltage Sag Detection................................................. 32

Peak Detection........................................................................ 33

Overvoltage and Overcurrent Detection ............................ 34

Neutral Current Mismatch ................................................... 35

Phase Compensation ................................................................. 35

Reference Circuit........................................................................ 37

Digital Signal Processor............................................................. 37

Root Mean Square Measurement............................................. 37

Current RMS Calculation ..................................................... 38

Current Mean Absolute Value Calculation......................... 39

Voltage Channel RMS Calculation ...................................... 40

Voltage RMS Offset Compensation..................................... 41

Active Power Calculation .......................................................... 41

Total Active Power Calculation ............................................ 41

Fundamental Active Power Calculation.............................. 43

Active Power Gain Calibration............................................. 43

Active Power Offset Calibration .......................................... 43

Sign of Active Power Calculation......................................... 43

Active Energy Calculation .................................................... 44

Integration Time Under Steady Load.................................. 45

Energy Accumulation Modes ............................................... 46

Line Cycle Active Energy Accumulation Mode ................. 46

Reactive Power Calculation ...................................................... 47

Reactive Power Gain Calibration......................................... 48

Reactive Power Offset Calibration....................................... 48

Sign of Reactive Power Calculation..................................... 48

Reactive Energy Calculation................................................. 49

Integration Time Under A Steady Load .............................. 51

Energy Accumulation Modes ............................................... 51

Line Cycle Reactive Energy Accumulation Mode ............. 51

Apparent Power Calculation..................................................... 52

Apparent Power Gain Calibration ....................................... 53

Apparent Power Offset Calibration ..................................... 53

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