ADE7878, ADE7868, ADE7858, ADE7854 Polyphase Multifunction Energy Metering ICs Overview Features •Supplies total (fundamental and harmonic) active/reactive/ apparent energy and fundamental active/reactive energy on each phase and on the overall system •Highly accurate; supports EN 50470-1, EN 50470-3, IEC 62053-21, IEC 62053-22, and IEC 62053-23 •Compatible with 3-phase, 3- or 4-wire (delta or wye), and other 3-phase services •Less than 0.1% error in active and reactive energy over a dynamic range of 1000 to 1 at 25°C •Supports current transformer and di/dt current sensors •Dedicated ADC channel for the neutral current input •Supplies sampled waveform data on all 3 phases and neutral current •Single 3.3 V supply •40-lead, lead-free, lead frame chip scale package (LFCSP) •Operating temperature –40° to +85°C •Flexible I C , SPI, HSDC serial interfaces 2 ® The ADE7878, ADE7868, ADE7858, and ADE7854 are high accuracy, 3-phase electrical energy measurement ICs with serial interfaces and three flexible pulse outputs. They incorporate six or seven second-order Σ-∆ ADCs, a digital integrator, reference circuitry, and all the signal processing required to perform total (fundamental and harmonic) active, reactive, and apparent energy measurement, fundamental only active and reactive energy measurement, and rms calculations. These metering ICs are 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. They provide system calibration features for each phase: rms offset correction, phase calibration, and gain calibration. 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. •Less than 0.2% error in active and reactive energy over a dynamic range of 3000 to 1 at 25°C www.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 X2 1.2V REF HPFDIS [23:0] IAP 7 IBP 9 APHCAL PGA3 IBN 12 ADC TOTAL/FUNDAMENTAL ACTIVE/REACTIVE ENERGIES, APPARENT ENERGY AND VOLTAGE/ CURRENT RMS CALCULATION FOR PHASE B (SEE PHASE A FOR DETAILED DATA PATH) ADC ADC ADC VN 18 AVAROS HPFDIS [23:0] INN 16 ADC 33 CF1 DFC AFVAROS AFVARGAIN NIRMS LPF : DFC 34 CF2 35 CF3/HSCLK 29 IRQ0 32 IRQ1 36 SCLK/SCL 38 MOSI/SDA 37 MISO/HSD 39 SS/HSA CFxDEN NIRMSOS X2 HPF PHASE A, B, AND C DATA AFWATTOS AFWGAIN COMPUTATIONAL BLOCK FOR FUNDAMENTAL ACTIVE AND REACTIVE POWER NIGAIN PGA2 AVARGAIN COMPUTATIONAL BLOCK FOR TOTAL REACTIVE POWER DIGITAL INTEGRATOR : DFC CFxDEN HPF TOTAL/FUNDAMENTAL ACTIVE/REACTIVE ENERGIES, APPARENT ENERGY AND VOLTAGE/ CURRENT RMS CALCULATION FOR PHASE C (SEE PHASE A FOR DETAILED DATA PATH) PGA3 VCP 19 AWGAIN LPF PGA1 ICN 14 INP 15 AWATTOS HPFDIS [23:0] 𝚽𝚽 PGA3 CFxDEN AVRMSOS HPF AVGAIN ADC PGA1 VBP 22 ICP 13 𝚽𝚽 ADC IAN 8 ADE7878 AVRMS LPF AIGAIN PGA1 VAP 23 X2 DIGITAL INTEGRATOR AVAGAIN AIRMS LPF SPI/I2C DIGITAL SIGNAL PROCESSOR General Description The ADE7878, ADE7868, ADE7858, and ADE7854 have waveform sample registers that allow access to all ADC outputs. These devices also incorporate 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 table below indicates feature sets available for each of the products. All products provide the same level of performance and accuracy. The ADE7854 features active energy measurements only. The ADE7858 adds reactive energy measurements. The ADE7868 and ADE7878 include a seventh ADC channel for neutral current measurements. These parts also include advanced antitamper features and power-down modes. The ADE7878 adds fundamental active and reactive power measurements. Part Number Watt VAR Tamper Detect Low Power Modes Fundamental Powers ADE7878 • • • • • ADE7868 • • • • ADE7858 • • ADE7854 • I 2C HSDC : Analog Devices, Inc. Worldwide Headquarters Analog Devices, Inc. One Technology Way P.O. Box 9106 Norwood, MA 02062-9106 U.S.A. Tel: 781.329.4700 (800.262.5643, U.S.A. only) Fax: 781.461.3113 Analog Devices, Inc. Europe Headquarters Analog Devices, Inc. Wilhelm-Wagenfeld-Str. 6 80807 Munich Germany Tel: 49.89.76903.0 Fax: 49.89.76903.157 Analog Devices, Inc. Japan Headquarters Analog Devices, KK New Pier Takeshiba South Tower Building 1-16-1 Kaigan, Minato-ku, Tokyo, 105-6891 Japan Tel: 813.5402.8200 Fax: 813.5402.1064 Analog Devices, Inc. Southeast Asia Headquarters Analog Devices 22/F One Corporate Avenue 222 Hu Bin Road Shanghai, 200021 China Tel: 86.21.2320.8000 Fax: 86.21.2320.8222 ©2010 Analog Devices, Inc. All rights reserved. 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