High Performance, Polyphase Energy Metering AFE Data Sheet ADE9078 FEATURES FUNCTIONAL BLOCK DIAGRAM 7 high performance analog-to-digital converters (ADCs) LDO ADE9078 101 dB signal-to-noise ratio (SNR) PGA ADC 10,000:1 dynamic range METROLOGY FEATURES Wide input range: 1 V, 0.707 V rms full scale PGA CF1 ADC TO CF4 (PER PHASE) Differential inputs IRMS, VRMS PGA ADC ACTIVE POWER, VA 25 ppm/C maximum channel temperature drift (including SINC4 WATTHOUR, VA-Hr AND IRQ0 ADC, internal V , and PGA drift) enabling Class 0.2 PGA WAVEFORM BUFFER REF ADC DECIMATION IRQ1 LINE FREQUENCY meters with standard external components ETC. PGA ADC Power quality measurements SPI PGA ADC Line frequency: 1 measurement per phase Zero crossing detection, zero-crossing timeout PGA ADC Phase angle measurements 1.25V REFERENCE Supports current transformers (CTs) and Rogowski coil (di/dt) sensors Figure 1. Multiple range phase/gain compensation for CTs Digital integrator for Rogowski coils Flexible waveform buffer Able to resample waveform to ensure 64 points per line cycle for ease of external harmonic analysis Events can trigger waveform storage Simplifies data collection for IEC 61000-4-7 harmonic analysis Advanced metrology feature set Total active power, volt-amperes reactive (VAR), volt- amperes (VA), watthour, VAR-hour, and VA-hour The ADE9078 integrates seven high performances ADCs and a Fundamental VAR and VAR-hour Current and voltage rms per phase (xIRMS, xVRMS) flexible DSP core. An integrated high end reference ensures low Supports active energy standards: IEC 62053-21, drift over temperature with a combined drift of less than IEC 62053-22 EN50470-3 OIML R46, ANSI C12.20 25 ppm/C maximum per channel, each of which includes a Supports reactive energy standards: IEC 62053-23, programmable gain amplifier (PGA) and ADC. IEC 62053-4 The ADE9078 offers an integrated flexible waveform buffer that High speed communication port stores samples at a fixed data rate or a sampling rate that varies 10 MHz serial peripheral interface (SPI) based on line frequency to ensure 64 points per line cycle. These two options make it easy to implement harmonic analysis in an APPLICATIONS external processor according to IEC 61000-4-7. Polyphase meters Two power modes are provided to enable detection of meter Power quality monitoring tampering: PSM2 uses a low power comparator to compare Protective device current channels to a threshold and indicates whether it is GENERAL DESCRIPTION IRQ0 IRQ1 exceeded on the and outputs PSM1 enables fast 1 The ADE9078 is a highly accurate, fully integrated energy measurement of current and voltage rms (xVRMS and xIRMS), metering device. Interfacing with both current transformer active power, and VAR during a tamper. (CT) and Rogowski coil sensors, the ADE9078 enables users to The ADE9078 allows advanced and highly accurate energy develop a 3-phase metrology platform, which achieves high measurements, enabling one platform to cover a wide range of performance for Class 1 up to Class 0.2 meters. meters, through a combination of various high end metrology features and superior analog performance. 1 Protected by U.S. Patents 5,952,849 6,873,065 7,075,329 6,262,600 7,489,526 7,558,080. Other patents are pending. Rev. 0 Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 2016 Analog Devices, Inc. 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Technical Support www.analog.com 14331-001ADE9078 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Phase Sequence Error Detection .............................................. 55 Applications ....................................................................................... 1 Quick Start ....................................................................................... 56 General Description ......................................................................... 1 Applications Information .............................................................. 57 Functional Block Diagram .............................................................. 1 Non-Blondel Compliant Meters ............................................... 58 Revision History ............................................................................... 3 Applying the ADE9078 to a 4-Wire Wye Service ...................... 58 Specif icat ions ..................................................................................... 4 Applying the ADE9078 to a 3-Wire Delta Service ................. 59 Timing Characteristics ................................................................ 7 Applying the ADE9078 to a Non-Blondel Compliant, 4-Wire Wye Service ................................................................................. 60 Absolute Maximum Ratings ............................................................ 9 Applying the ADE9078 to a Non-Blondel Compliant, 4-Wire Thermal Resistance ...................................................................... 9 Delta Service ............................................................................... 60 ESD Caution .................................................................................. 9 Service Type Summary .............................................................. 60 Pin Configuration and Function Descriptions ........................... 10 Accessing On-Chip Data ............................................................... 62 Typical Performance Characteristics ........................................... 12 SPI Protocol Overview .............................................................. 62 Total Energy Linearity over Supply and Temperature ........... 12 SPI Write ...................................................................................... 63 Fundamental Energy Linearity with Fifth Harmonic over SPI Read ....................................................................................... 63 Supply and Temperature ............................................................ 13 SPI Burst Read ............................................................................ 63 Total Energy Error over Frequency .......................................... 14 SPI Protocol CRC ....................................................................... 64 RMS Linearity over Temperature and RMS Error over Frequency .................................................................................... 15 Additional Communication Verification Registers ............... 64 Energy Linearity Repeatability ................................................. 16 CRC of Configuration Registers............................................... 65 Total Energy and RMS Linearity with Integrator On ............ 17 Configuration Lock .................................................................... 65 Total Energy Error over Frequency with Integrator On ....... 18 Waveform Buffer ............................................................................ 66 Test Circuit ...................................................................................... 19 Fixed Data Rate Waveforms ...................................................... 67 Terminology .................................................................................... 20 Fixed Data Rate Waveforms Filling and Trigger-Based Modes .. 68 Theory Of Operation ..................................................................... 22 Resampled Waveforms .............................................................. 70 ADC ............................................................................................. 22 Configuring the Waveform Buffer ........................................... 70 Crystal Oscillator/External Clock ............................................ 24 Burst Read Waveform Buffer Samples from SPI .................... 71 Power Management .................................................................... 25 Interrupts/Events ............................................................................ 74 Measurements (Normal Mode) ................................................ 27 Interrupts (IRQ0 and IRQ1) ..................................................... 74 Measurements (PSM1) .............................................................. 45 EVENT ........................................................................................ 74 Measurements (PSM2) .............................................................. 54 Status Bits in Additional Registers ........................................... 74 Key Features .................................................................................... 55 Troubleshooting .............................................................................. 75 Flexible Waveform Buffer with Resampling ........................... 55 SPI Does Not Work .................................................................... 75 Multipoint Phase/Gain Calibration ......................................... 55 PSM2 CFG Register Value Is Not Retained When Going from PSM2 or PSM3 to PSM0 .................................................. 75 RMS of Sum of Instantaneous Currents Measurement ......... 55 Register Information ...................................................................... 76 Tamper Modes ............................................................................ 55 Register Details ........................................................................... 88 Power Factor................................................................................ 55 Outline Dimensions ..................................................................... 107 Zero-Crossing Timeout Detection ........................................... 55 Ordering Guide ........................................................................ 107 Line Period Measurement ......................................................... 55 Angle Measurement ................................................................... 55 Rev. 0 Page 2 of 107