ADE7880—Polyphase Energy Metering IC Includes High Accuracy Harmonic Analysis Features • Supports IEC 62053-21, • 10 ppm/°C typical reference drift IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, and ANSI C12.20 standards with external overdrive capability • 40-lead lead frame chip scale • Supports IEC 61000-4-7 Class I and II accuracy specification • Supplies rms, active, reactive and apparent powers, power factor, THD + N and harmonic distortion of all harmonics within 2.8 KHz pass band package (LFCSP), Pb-free, pin for pin compatible with ADE7854, ADE7858, ADE7868, and ADE7878 • Wide-supply voltage operation: 2.4 V to 3.7 V • Operating temperature: −40° to +85°C • Supports current transformer and di/dt current sensors Parameter Error Rate Dynamic Range @ TA = 25°C Harmonic voltage/current rms <1% error 2000:1 Harmonic active/reactive powers <1% error 2000:1 Active/reactive energy <0.1% error 1000:1 Active/reactive energy <0.2% error 5000:1 Voltage/current rms <0.1% error 1000:1 The ADE7880 is a high accuracy, 3-phase electrical energy measurement IC featuring an adaptive real time monitoring (ARTM) harmonic engine. ARTM is capable of monitoring three user selectable harmonics, in addition to the fundamental. ARTM automatically tracks fundamental frequency and provides real-time harmonic measurement updates. Harmonic analysis includes current rms, voltage rms, active, reactive, and apparent powers, power factor, harmonic distortion, and total harmonic distortion plus noise (THD + N) calculations. The ADE7880 incorporates seven second-order Σ-Δ ADCs, a digital integrator, reference circuitry, and all the signal processing required to perform total (fundamental and harmonic) active, fundamental active, fundamental reactive, and apparent energy measurement and rms calculations. The ADE7880 is suitable to measure active, reactive, and apparent energy in various 3-phase configurations, such as wye or delta services, with both three and four wires. This metering IC provides system calibration features for each phase: rms and energy offset correction, phase calibration, and gain calibration. The ADE7880 supports IEC 62053-21, IEC 62053-22, IEC 62053-23, EN 50470-1, EN 50470-3, ANSI C12.20, and IEC 61000-4-7 standards. The ADE7880 is pin compatible with the popular ADE7878, ADE7868, ADE7858, and ADE7854 3-phase energy metering ICs. analog.com/energymeter Functional Block Diagram RESET REF IN/OUT 4 17 VDD AGND AVDD 26 DVDD DGND 5 6 24 25 AIRMSOS POR CLKIN 27 CLKOUT 28 LDO LDO 1.2V REF HPFEN OF CONFIG3 IAP 7 AIGAIN PGA1 ADC IAN 8 PGA3 VAP 23 IBP 9 ADC PGA1 ADC IBN 12 PGA3 VBP 22 ICP 13 𝚹 ADC 𝚹 COMPUTATIONAL BLOCK FOR FUNDAMENTAL ACTIVE AND REACTIVE POWER PGA1 ADC ICN 14 PGA3 VCP 19 ADC VN 18 AWGAIN TOTAL/FUNDAMENTAL ACTIVE ENERGIES, FUNDAMENTAL REACTIVE ENERGY, APPARENT ENERGY, VOLTAGE/CURRENT RMS, HARMONIC INFORMATION CALCULATION FOR PHASE C (SEE PHASE A FOR DETAILED PATH) : DFC APGAIN AFWATTOS APGAIN AFVAROS PHASE A, B, AND C DATA : DFC ADC INN 16 DIGITAL INTEGRATOR NIGAIN PGA2 DFC NIRMSOS X2 HPF 34 CF2/HREADY 35 CF3/HSCLK 29 IRQ0 32 IRQ1 36 SCLK/SCL 38 MOSI/SDA 37 MISO/HSD 39 SS/HSA CF3DEN SPI/I2C INP 15 CF1 : COMPUTATIONAL BLOCK FOR HARMONIC INFORMATION ON PHASE A CURRENT AND VOLTAGE COMPUTATIONAL BLOCK FOR HARMONIC INFORMATION ON NEUTRAL CURRENT HPFEN OF CONFIG3 33 CF2DEN LPF HPF TOTAL/FUNDAMENTAL ACTIVE ENERGIES, FUNDAMENTAL REACTIVE ENERGY, APPARENT ENERGY, VOLTAGE/CURRENT RMS, HARMONIC INFORMATION CALCULATION FOR PHASE B (SEE PHASE A FOR DETAILED PATH) PM1 CF1DEN AVRMSOS AWATTOS HPFEN OF CONFIG3 AVGAIN PM0 28 AVRMS LPF HPF APHCAL AIRMS LPF X2 DIGITAL INTEGRATOR 27 AVAGAIN X2 LPF I2 C NIRMS DIGITAL SIGNAL PROCESSOR HSDC General Description The ADE7880 ARTM features complete harmonic analysis including magnitude and phase information. ARTM also computes harmonic distortion relative to the fundamental, as well as THD + N. Harmonic analysis data can be accessed in real time using a burst mode transfer via an SPI interface. The ADE7880 waveform sample registers allow access to all ADC outputs. This device also incorporates power quality measurements such as short duration low or high voltage detections, short duration high current variations, line voltage period measurement, and angles between phase voltages and currents. Two serial interfaces can be used for communication: SPI or I2C. A dedicated high speed interface HSDC (high speed data capture) port can be used in conjunction with I2C to provide access to the ADC outputs and real-time power information. Two interrupt request pins, IRQ0 and IRQ1, indicate that an enabled interrupt event has occurred. The CF1, CF2, and CF3 logic outputs provide a wide choice of power information: total/fundamental active/reactive power, total apparent power, or sum of current rms values. ADE7880 Harmonic Calculations PHASE SELECTION A OR B OR C OR N HARMONIC INDEXES X Y Z 3 HARMONICS AND FUNDAMENTAL RESULTS IA, VA IB, VB IC, VC HARMONIC COMPUTATION ENGINE WATT IRMS POWER FACTOR VAR VRMS HARMONIC DISTORTION VA THD + N IN, ISUM NEUTRAL AND ISUM RESULTS IRMS ISUMRMS TIME BASE, UPDATE RATE, AND DATA INTERFACE OPTIONS I 2C refers to a communications protocol originally developed by Philips Semiconductors (now NXP Semiconductors). ©2011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Printed in the U.S.A. PH10189-2-9/11 analog.com/energymeter Analog Devices, Inc. Worldwide Headquarters Analog Devices, Inc. One Technology Way P.O. Box 9106 Norwood, MA 02062-9106 U.S.A. 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