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ADE7754AR Folha de dados(PDF) 1 Page - Analog Devices |
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ADE7754AR Folha de dados(HTML) 1 Page - Analog Devices |
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1 / 44 page  REV. PrG 01/03 PRELIMINARY TECHNICAL DATA 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 rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Preliminary Technical Data ADE7754* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 200 3 Poly-phaseMulti-Function Energy Metering IC with Serial Port FUNCTIONAL BLOCK DIAGRAM FEATURES High Accuracy, supports IEC 687/61036 Compatible with 3-phase/3-wire, 3-phase/4-wire and any type of 3-phase services Less than 0.1% error in Active Power Measurement over a dynamic range of 1000 to 1 The ADE7754 supplies Active Energy, Apparent Energy, Voltage rms, Current rms and Sampled Waveform Data. Digital Power, Phase & Input Offset Calibration. An On-Chip temperature sensor (±3°C typ. after calibration) On-Chip user Programmable thresholds for line voltage SAG and overdrive detections. A SPI compatible Serial Interface with Interrupt Request line (IRQ). A pulse output with programmable frequency Proprietary ADCs and DSP provide high accuracy over large variations in environmental conditions and time. Reference 2.4V±8% (Drift 30 ppm/°C typical) with external overdrive capability Single 5V Supply, Low power (80mW typical) The ADE7754 provides different solutions to measure Active and Apparent Energy from the six analog inputs thus en- abling the use of the ADE7754 in various Power meter services as 3-phase 4-wire, 3-phase 3-wire but also 4-wire delta. In addition to RMS calculation, Real and Apparent power informations, the ADE7754 provides system calibration features for each phase, i.e., channel offset correction, phase calibration and gain calibration. The CF logic output gives instantaneous real power information. The ADE7754 has a waveform sample register which enables access to ADC outputs. The part also incorporates a detec- tion circuit for short duration low or high voltage variations. The voltage threshold levels and the duration (no. of half line cycles) of the variation are user programmable. A zero crossing detection is synchronized which the zero crossing point of the line voltage of each of the three phases. This information is used to measure each line’s Period. It is also used internally to the chip in the Line Active Energy and Line Apparent Energy accumulation modes. This permits faster and more accurate calibration of the power calcula- tions. This signal is also useful for synchronization of relay switching. Data is read from the ADE7754 via the SPI serial interface. The interrupt request output (IRQ) is an open drain, active low logic output. The IRQ output will go active low when one or more interrupt events have occurred in the ADE7754. A status register will indicate the nature of the interrupt. The ADE7754 is available in a 24-lead SOIC package. * Patents pending. CS IRQ ADE7754 REGISTERS & SERIAL INTERFACE TEMP SENSOR ADC 2.5V REF 4k Ω CFNUM CFDEN DFC WDIV ADC PGA1 ADC PGA2 ADC PGA1 ADC PGA2 ADE7754 Power Supply Monitor HPF Φ APHCAL Σ AAPOS LPF2 AWG ADC PGA1 ADC PGA2 Σ AIRMSOS AVAG AVRMSOS VADIV Σ BAPOS LPF2 BWG Σ BIRMSOS BVAG BVRMSOS Σ CAPOS LPF2 CWG Σ CIRMSOS CVAG CVRMSOS AVGAIN AAPGAIN HPF BVGAIN BAPGAIN HPF CVGAIN CAPGAIN Φ BPHCAL Φ CPHCAL Σ Σ IBP IBN VBP VN ICP ICN VCP IAP IAN VAP 7 8 15 10 14 13 5 6 16 AVDD RESET 17 4 CLKOUT CLKIN DGND 20 19 2 DVDD 3 CF 1 REFIN/OUT AGND SCLK DOUT DIN 11 12 22 24 23 21 18 Σ Σ Σ |X| ABS |X| ABS |X| ABS X2 X2 X2 X2 X2 X2 GENERAL DESCRIPTION The ADE7754 is a high accuracy Poly-phase electrical energy measurement IC with a serial interface and a pulse output. The ADE7754 incorporates second order sigma- delta ADCs, reference circuitry, temperature sensor, and all the signal processing required to perform Active, Apparent Energy measurements and rms calculation. |
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