ade7854 Analog Devices, Inc., ade7854 Datasheet - Page 2

• Manufacturer Part Number: ade7854
• Description: Poly Phase Multifunction Energy Metering Ic With Neutral Current Measurement
• Manufacturer: Analog Devices, Inc.

ADE7854
TABLE OF CONTENTS
Features .............................................................................................. 1
General Description ......................................................................... 1
Functional Block Diagram .............................................................. 4
Specifications ..................................................................................... 5
Absolute Maximum Ratings .......................................................... 10
Pin Configuration and Function Descriptions ........................... 11
Terminology .................................................................................... 13
Typical Performance Characteristics ........................................... 14
Test Circuits ..................................................................................... 15
Power Management ........................................................................ 16
Theory of Operation ...................................................................... 19
Timing Characteristics ................................................................ 7
ESD Caution ................................................................................ 10
Analog Inputs .............................................................................. 19
Analog to Digital Conversion ................................................... 19
Current Channel ADC............................................................... 20
di/dt Curent Sensor And Digital Integrator ............................ 22
Voltage Channel ADC ............................................................... 23
Changing Phase voltage data path ........................................... 24
Power Quality Measurements ................................................... 24
PSM0 – Normal Power Mode ............................................... 16
PSM3 – Sleep Mode ............................................................... 16
Power Up Procedure .............................................................. 16
Hardware Reset ....................................................................... 17
Software Reset Functionality ................................................ 17
Antialiasing Filter ................................................................... 20
ADC Transfer Function ......................................................... 20
Current Waveform Gain Registers ....................................... 20
Current Channel HPF ........................................................... 21
Current Channel Sampling ................................................... 21
Voltage Waveform Gain Registers ........................................ 23
Voltage Channel HPF ............................................................ 23
Voltage Channel Sampling .................................................... 23
Zero Crossing Detection ....................................................... 24
Zero-Crossing Timeout ......................................................... 25
Phase Sequence Detection .................................................... 25
Time Interval Between Phases .............................................. 26
Period Measurement .............................................................. 27
Phase Voltage Sag Detection ................................................. 27
Peak Detection ........................................................................ 28
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Phase Compensation ................................................................. 30
Reference Circuit ........................................................................ 31
Digital Signal Processor ............................................................. 31
Root Mean Square Measurement ............................................. 32
Active Power Calculation .......................................................... 34
Apparent Power Calculation ..................................................... 38
Waveform Sampling Mode ....................................................... 40
Energy to Frequency Conversion ............................................. 41
No-Load Condition ................................................................... 44
Checksum Register..................................................................... 45
Interrupts ..................................................................................... 46
Serial Interfaces .......................................................................... 47
Overvoltage and Overcurrent Detection ............................ 29
Current RMS Calculation ..................................................... 32
Voltage Channel RMS Calculation ...................................... 33
Voltage RMS Offset Compensation ..................................... 33
Total Active Power Calculation ............................................ 34
Active Power Gain Calibration ............................................. 35
Active Power Offset Calibration .......................................... 35
Sign of Active Power Calculation ......................................... 35
Active Energy Calculation .................................................... 35
Integration Time Under Steady Load .................................. 37
Energy Accumulation Modes ............................................... 37
Line Cycle Active Energy Accumulation Mode ................. 37
Apparent Power Gain Calibration ....................................... 38
Apparent Power Offset Calibration ..................................... 39
Apparent Power Calculation using VNOM ........................ 39
Apparent Energy Calculation ............................................... 39
Integration Time Under Steady Load .................................. 40
Energy Accumulation Mode ................................................. 40
Line Cycle Apparent Energy Accumulation Mode ............ 40
Synchronizing energy registers with CFx outputs ............. 42
CF outputs for various accumulation modes ..................... 43
Sign of sum of phase powers in CFx data path .................. 43
No-load detection based on total active power .................. 44
No-load detection based on apparent power ..................... 44
Using the Interrupts with an MCU ...................................... 46
Serial interface choice ............................................................ 47
I
SPI Compatible Interface ...................................................... 48
2
C Compatible Interface ....................................................... 47
Preliminary Technical Data