ADE7854A/ADE7858A/ADE7868A/ADE7878A
Data Sheet
TABLE OF CONTENTS
Features .............................................................................................. 1
Reference Circuit........................................................................ 42
Digital Signal Processor............................................................. 43
Root Mean Square Measurement............................................. 44
Active Power Calculation.......................................................... 48
General Description......................................................................... 1
Revision History ............................................................................... 3
Functional Block Diagrams............................................................. 4
Specifications..................................................................................... 8
Timing Characteristics .............................................................. 11
Absolute Maximum Ratings.......................................................... 14
Thermal Resistance .................................................................... 14
ESD Caution................................................................................ 14
Pin Configuration and Function Descriptions........................... 15
Typical Performance Characteristics ........................................... 17
Test Circuit ...................................................................................... 20
Terminology .................................................................................... 21
Power Management........................................................................ 22
PSM0 Normal Power Mode (All Devices) .............................. 22
Reactive Power Calculation—ADE7858A, ADE7868A,
ADE7878A Only......................................................................... 54
Apparent Power Calculation..................................................... 58
Waveform Sampling Mode ....................................................... 61
Energy to Frequency Conversion............................................. 61
No Load Condition.................................................................... 65
Checksum Register..................................................................... 66
Interrupts..................................................................................... 67
Applications Information.............................................................. 69
Quick Setup of Devices as Energy Meters .............................. 69
Crystal Circuit ............................................................................ 69
Layout Guidelines....................................................................... 70
ADE7878A Evaluation Board................................................... 70
Die Version.................................................................................. 70
Silicon Anomaly ............................................................................. 71
PSM1 Reduced Power Mode (ADE7868A and ADE7878A
Only) ............................................................................................ 22
PSM2 Low Power Mode (ADE7868A and ADE7878A Only)
....................................................................................................... 22
PSM3 Sleep Mode (All Devices)............................................... 24
Power-Up Procedure.................................................................. 26
Hardware Reset........................................................................... 26
Software Reset............................................................................. 27
Theory of Operation ...................................................................... 28
Analog Inputs.............................................................................. 28
Analog-to-Digital Conversion.................................................. 28
Current Channel ADC............................................................... 29
di/dt Current Sensor and Digital Integrator............................... 31
Voltage Channel ADC ............................................................... 32
Changing the Phase Voltage Datapath .................................... 33
Power Quality Measurements................................................... 33
Phase Compensation.................................................................. 41
ADE7854A/ADE7858A/ADE7868A/ADE7878A
Functionality Issues.................................................................... 71
Functionality Issues.................................................................... 71
Serial Interfaces............................................................................... 72
Serial Interface Selection........................................................... 72
Communication Verification.................................................... 72
I2C-Compatible Interface .......................................................... 72
SPI-Compatible Interface.......................................................... 74
HSDC Interface .......................................................................... 76
Register List..................................................................................... 78
Outline Dimensions....................................................................... 96
Ordering Guide .......................................................................... 96
Rev. D | Page 2 of 96
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