Single-Phase Active and Apparent Energy Metering IC Data Sheet ADE7763 perform active and apparent energy measurements, line-voltage FEATURES period measurements, and rms calculation on the voltage and High accuracy supports IEC 61036/60687, IEC62053-21, and current channels. The selectable on-chip digital integrator IEC62053-22 provides direct interface to di/dt current sensors such as On-chip digital integrator enables direct interface-to-current Rogowski coils, eliminating the need for an external analog sensors with di/dt output integrator and resulting in excellent long-term stability and precise A PGA in the current channel allows direct interface to phase matching between the current and the voltage channels. shunts and current transformers Active and apparent energy, sampled waveform, and current The ADE7763 provides a serial interface to read data and a and voltage rms pulse output frequency (CF) that is proportional to the active Less than 0.1% error in active energy measurement over a power. Various system calibration features such as channel dynamic range of 1000 to 1 at 25C offset correction, phase calibration, and power calibration Positive-only energy accumulation mode available ensure high accuracy. The part also detects short duration, low On-chip user programmable threshold for line voltage surge or high voltage variations. and SAG and PSU supervisory The positive-only accumulation mode gives the option to Digital calibration for power, phase, and input offset accumulate energy only when positive power is detected. An On-chip temperature sensor (3C typical) internal no-load threshold ensures that the part does not exhibit SPI-compatible serial interface any creep when there is no load. The zero-crossing output (ZX) Pulse output with programmable frequency produces a pulse that is synchronized to the zero-crossing point Interrupt request pin ( ) and status register IRQ of the line voltage. This signal is used internally in the line cycle Reference 2.4 V with external overdrive capability active and apparent energy accumulation modes, which enables Single 5 V supply, low power (25 mW typical) faster calibration. GENERAL DESCRIPTION The interrupt status register indicates the nature of the interrupt, 1 The ADE7763 features proprietary ADCs and fixed function DSP and the interrupt enable register controls which event produces for high accuracy over large variations in environmental conditions an output on the IRQ pin, an open-drain, active low logic output. and time. The ADE7763 incorporates two second-order, 16-bit The ADE7763 is available in a 20-lead SSOP package. - ADCs, a digital integrator (on Ch1), reference circuitry, a temperature sensor, and all the signal processing required to FUNCTIONAL BLOCK DIAGRAM AVDD DVDD DGND RESET INTEGRATOR WGAIN 11:0 PGA ADE7763 MULTIPLIER LPF2 V1P dt ADC V1N HPF1 TEMP APOS 15:0 SENSOR CFNUM 11:0 IRMSOS 11:0 LPF3 VAGAIN 11:0 DFC CF 2 x PGA VRMSOS 11:0 CFDEN 11:0 V2P x ADC V2N VADIV 7:0 % % WDIV 7:0 PHCAL 5:0 LPF1 LPF3 ZX SAG 4k 2.4V REGISTERS AND REFERENCE SERIAL INTERFACE AGND REF CLKIN CLKOUT DIN DOUT SCLK CS IRQ IN/OUT Figure 1. 1 U.S. Patents 5,745,323 5,760,617 5,862,069 5,872,469. 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 20042013 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com 04481-A-001ADE7763 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Active Power Calculation .......................................................... 25 General Description ......................................................................... 1 Energy Calculation ..................................................................... 27 Functional Block Diagram .............................................................. 1 Power Offset Calibration ........................................................... 29 Revision History ............................................................................... 3 Energy-to-Frequency Conversion............................................ 29 Specifications ..................................................................................... 4 Line Cycle Energy Accumulation Mode ................................. 31 Timing Characteristics ................................................................ 6 Positive-Only Accumulation Mode ......................................... 31 Absolute Maximum Ratings ............................................................ 7 No-Load Threshold .................................................................... 31 ESD Caution .................................................................................. 7 Apparent Power Calculation ..................................................... 32 Terminology ...................................................................................... 8 Apparent Energy Calculation ................................................... 33 Pin Configuration and Function Descriptions ............................. 9 Line Apparent Energy Accumulation ...................................... 34 Typical Performance Characteristics ........................................... 11 Energies Scaling .......................................................................... 35 Theory of Operation ...................................................................... 14 Calibrating an Energy Meter .................................................... 35 Analog Inputs .............................................................................. 14 CLKIN Frequency ...................................................................... 44 di/dt Current Sensor and Digital Integrator ........................... 15 Suspending Functionality.......................................................... 45 Zero-Crossing Detection ........................................................... 16 Checksum Register..................................................................... 45 Period Measurement .................................................................. 17 Serial Interface ............................................................................ 45 Power Supply Monitor ............................................................... 17 Registers ........................................................................................... 48 Line Voltage Sag Detection ....................................................... 18 Register Descriptions ..................................................................... 51 Peak Detection ............................................................................ 18 Communication Register .......................................................... 51 Interrupts ..................................................................................... 19 Mode Register (0x09)................................................................. 51 Temperature Measurement ....................................................... 20 Interrupt Status Register (0x0B), Reset Interrupt Status Register (0x0C), Interrupt Enable Register (0x0A) ............... 53 Analog-to-Digital Conversion .................................................. 20 CH1OS Register (0x0D) ............................................................ 54 Channel 1 ADC .......................................................................... 21 Outline Dimensions ....................................................................... 55 Channel 2 ADC .......................................................................... 23 Ordering Guide .......................................................................... 55 Phase Compensation .................................................................. 24 Rev. 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