Single Phase, Multifunction Metering IC with Neutral Current Measurement Data Sheet ADE7953 The device incorporates three - ADCs with a high accuracy FEATURES energy measurement core. The second input channel simulta- Highly accurate supports EN 50470-1, EN 50470-3, IEC 62053- neously measures neutral current and enables tamper detection 21, IEC 62053-21, IEC 62053-22, and IEC 62053-23 standards and neutral current billing. The additional channel incorporates Measures active, reactive, and apparent energy sampled a complete signal path that allows a full range of measurements. waveform current and voltage rms Each input channel supports independent and flexible gain stages, Provides a second current input for neutral current making the device suitable for use with a variety of current sensors measurement such as current transformers (CTs) and low value shunt resistors. Less than 0.1% error in active and reactive energy Two on-chip integrators facilitate the use of Rogowski coil sensors. measurements over a dynamic range of 3000:1 Less than 0.2% error in instantaneous IRMS measurement The ADE7953 provides access to on-chip meter registers via a 2 over a dynamic range of 1000:1 variety of communication interfaces including SPI, I C, and UART. Provides apparent energy measurement and instantaneous Two configurable low jitter pulse output pins provide outputs that power readings are proportional to active, reactive, or apparent energy, as well as 1.23 kHz bandwidth operation current and voltage rms. A full range of power quality information Flexible PGA gain stage (up to 22) such as overcurrent, overvoltage, peak, and sag detection are Includes internal integrators for use with Rogowski coil sensors accessible via the external IRQ pin. Independent active, reactive, 2 SPI, I C, or UART communication and apparent no-load detections are included to prevent meter REVP creep. Dedicated reverse power ( ), zero-crossing voltage GENERAL DESCRIPTION (ZX), and zero-crossing current (ZX I) pins are also provided. The The ADE7953 is a high accuracy electrical energy measurement ADE7953 energy metering IC operates from a 3.3 V supply voltage IC intended for single phase applications. It measures line voltage and is available in a 28-lead LFCSP package. and current and calculates active, reactive, and apparent energy, as well as instantaneous rms voltage and current. FUNCTIONAL BLOCK DIAGRAM REF RESET VDD VINTA VINTD AIRMSOS ADE7953 AVAGAIN 1.2V REF 2 X AIRMS LPF LOW DIGITAL NOISE INTEGRATOR AIGAIN PRE-AMP 2 X AVRMS IAP LPF PGA ADC HPF IAN VRMSOS AWGAIN APHCAL VGAIN AWATTOS CF1DEN VP ADC CF1 PGA DFC : HPF LPF VN PHASE AAND B CF2DEN ACTIVE, REACTIVE AND DATA APPARENT ENERGIES AND AVAROS AVARGAIN VOLTAGE/CURRENT RMS IBP DFC : CF2 CALCULATION FOR PHASE B COMPUTATIONAL PGA ADC (SEE PHASE A FOR DETAILED BLOCK FOR TOTAL IBN DATA PATH). REACTIVE POWER REVP REVP CONFIGURATION AND CONTROL ZX ZX ZX I ZX I AGND PEAK 2 UART SPI INTERFACE I C ANGLE DGND POWER FACTOR SAG CLKIN CLKOUT IRQ CS MISO/ MOSI/ SCLK SDA/Tx SCL/Rx Figure 1. Rev. C 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 20112016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 09320-001ADE7953 Data Sheet TABLE OF CONTENTS Features .....................................................................................1 Period Measurement ............................................................... 36 General Description ..................................................................1 Instantaneous Powers and Waveform Sampling ...................... 37 Functional Block Diagram.........................................................1 Power Factor ........................................................................... 38 Revision History ........................................................................3 Using the Line Cycle Accumulation Mode to Determine the Power Factor........................................................................ 38 Specifications .............................................................................4 Power Factor with No-Load Detection ................................ 38 Timing Characteristics...........................................................6 Angle Measurement............................................................. 39 Absolute Maximum Ratings ......................................................8 No-Load Detection.................................................................. 40 ESD Caution ..........................................................................8 Setting the No-Load Thresholds .......................................... 40 Pin Configuration and Function Descriptions...........................9 Active Energy No-Load Detection....................................... 40 Typical Performance Characteristics .......................................11 Reactive Energy No-Load Detection ................................... 41 Test Circuit ..............................................................................16 Apparent Energy No-Load Detection .................................. 41 Terminology ............................................................................17 Zero-Crossing Detection ......................................................... 43 ADE7953 Power-Up Procedure ...............................................18 Zero-Crossing Output Pins.................................................. 43 Required Register Setting.....................................................18 Zero-Crossing Interrupts..................................................... 43 Theory of Operation................................................................19 Zero-Crossing Timeout ....................................................... 44 Analog Inputs ......................................................................19 Zero-Crossing Threshold..................................................... 44 Analog-to-Digital Conversion .............................................19 Voltage Sag Detection.............................................................. 45 Current Channel ADCs .......................................................21 Setting the SAGCYC Register .............................................. 45 Voltage Channel ADC..........................................................21 Setting the SAGLVL Register ............................................... 45 Reference Circuit .................................................................22 Voltage Sag Interrupt ........................................................... 45 Root Mean Square Measurement.............................................23 Peak Detection ........................................................................ 46 Current Channel RMS Calculation ......................................23 Indication of Power Direction ................................................. 47 Voltage Channel RMS Calculation .......................................23 Reverse Power...................................................................... 47 Active Power Calculation.........................................................24 Sign Indication .................................................................... 47 Sign of Active Power Calculation .........................................25 Overcurrent and Overvoltage Detection ................................. 48 Active Energy Calculation....................................................25 Setting the OVLVL and OILVL Registers ............................ 48 Active Energy Accumulation Modes....................................27 Overvoltage and Overcurrent Interrupts ............................. 48 Reactive Power Calculation .....................................................28 Alternative Output Functions.................................................. 49 Sign of Reactive Power Calculation......................................28 ADE7953 Interrupts ................................................................ 50 Reactive Energy Calculation ................................................29 Primary Interrupts (Voltage Channel and Current Reactive Energy Accumulation Modes ................................30 Channel A) .......................................................................... 50 Apparent Power Calculation ....................................................31 Current Channel B Interrupts.............................................. 50 Apparent Energy Calculation...............................................31 Communicating with the ADE7953 ........................................ 51 Ampere-Hour Accumulation ...............................................32 Communication Autodetection ........................................... 51 Energy-to-Frequency Conversion............................................33 Locking the Communication Interface ................................ 51 Pulse Output Characteristics................................................33 SPI Interface ........................................................................ 52 Energy Calibration...................................................................34 2 I C Interface......................................................................... 53 Gain Calibration ..................................................................34 UART Interface.................................................................... 55 Phase Calibration .................................................................34 Communication Verification and Security .............................. 57 Offset Calibration ................................................................35 Rev. 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