ADE7858 datasheet(2/76 Pages) AD

Part #	ADE7858

Description	Poly Phase Multifunction Energy Metering IC with per Phase Active and Reactive Powers

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ADE7858

Preliminary Technical Data

Rev. PrA| Page 2 of 76

TABLE OF CONTENTS

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

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

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

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

Timing Characteristics ................................................................ 7

Absolute Maximum Ratings.......................................................... 10

ESD Caution................................................................................ 10

Pin Configuration and Function Descriptions........................... 11

Terminology .................................................................................... 13

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

Test Circuit ...................................................................................... 15

Power Management........................................................................ 16

PSM0 – Normal Power Mode............................................... 16

PSM3 – Sleep Mode ............................................................... 16

Power Up Procedure .............................................................. 16

Hardware Reset....................................................................... 17

Software Reset Functionality ................................................ 17

Theory of Operation ...................................................................... 19

Analog Inputs.............................................................................. 19

Analog to Digital Conversion ................................................... 19

Antialiasing Filter................................................................... 20

ADC Transfer Function......................................................... 20

Current Channel ADC............................................................... 20

Current Waveform Gain Registers....................................... 20

Current Channel HPF ........................................................... 21

Current Channel Sampling ................................................... 21

di/dt Curent Sensor And Digital Integrator ............................ 22

Voltage Channel ADC ............................................................... 22

Voltage Waveform Gain Registers........................................ 23

Voltage Channel HPF ............................................................ 23

Voltage Channel Sampling .................................................... 23

Changing Phase Voltage Data Path.......................................... 23

Power Quality Measurements................................................... 24

Zero Crossing Detection ....................................................... 24

Zero-Crossing Timeout......................................................... 25

Phase Sequence Detection .................................................... 25

Time Interval Between Phases.............................................. 25

Period Measurement.............................................................. 26

Phase Voltage Sag Detection................................................. 26

Peak Detection........................................................................ 27

Overvoltage and Overcurrent Detection ............................ 28

Phase Compensation ................................................................. 29

Reference Circuit........................................................................ 30

Digital Signal Processor............................................................. 30

Root Mean Square Measurement............................................. 31

Current RMS Calculation ..................................................... 31

Voltage Channel RMS Calculation ...................................... 32

Voltage RMS Offset Compensation..................................... 32

Active Power Calculation .......................................................... 33

Total Active Power Calculation............................................ 33

Active Power Gain Calibration............................................. 34

Active Power Offset Calibration .......................................... 34

Sign of Active Power Calculation......................................... 34

Active Energy Calculation .................................................... 35

Integration Time Under Steady Load.................................. 36

Energy Accumulation Modes ............................................... 36

Line Cycle Active Energy Accumulation Mode................. 36

Reactive Power Calculation ...................................................... 37

Reactive Power Gain Calibration......................................... 38

Reactive Power Offset Calibration....................................... 38

Sign of Reactive Power Calculation..................................... 38

Reactive Energy Calculation................................................. 39

Integration Time Under Steady Load.................................. 40

Energy Accumulation Modes ............................................... 40

Line Cycle Reactive Energy Accumulation Mode ............. 40

Apparent Power Calculation..................................................... 41

Apparent Power Gain Calibration ....................................... 41

Apparent Power Offset Calibration ..................................... 42

Apparent Power Calculation using VNOM........................ 42

Apparent Energy Calculation ............................................... 42

Integration Time Under Steady Load.................................. 43

Energy Accumulation Mode................................................. 43

Line Cycle Apparent Energy Accumulation Mode............ 43

Waveform Sampling Mode ....................................................... 43

Energy to Frequency Conversion............................................. 44

Synchronizing energy registers with CFx outputs............ 45

CF outputs for various accumulation modes ..................... 46

Sign of sum of phase powers in CFx data path .................. 47

No-Load Condition ................................................................... 47

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