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ADE7756BN Datasheet(PDF) 1 Page - Analog Devices |
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ADE7756BN Datasheet(HTML) 1 Page - Analog Devices |
1 / 32 page REV. 0 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 that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a ADE7756* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 Active Energy Metering IC with Serial Interface FUNCTIONAL BLOCK DIAGRAM MULTIPLIER DVDD HPF1 LPF2 DGND CLKOUT V1P V1N V2P V2N 2.4V REFERENCE ADC AVDD PGA CLKIN REFIN/OUT CF RESET AGND 4k PHCAL[5:0] MULTIPLIER APOS[11:0] DFC DIN DOUT SCLK CS SAG ZX IRQ ADE7756 REGISTERS AND SERIAL INTERFACE ADE7756 TEMP SENSOR APGAIN[11:0] CFDIV[11:0] LPF1 ADC FEATURES High Accuracy, Supports IEC 687/1036 Less than 0.1% Error over a Dynamic Range of 1000 to 1 An On-Chip User Programmable Threshold for Line Voltage SAG Detection and PSU Supervisory The ADE7756 Supplies Sampled Waveform Data (20 Bits) and Active Energy (40 Bits) Digital Power, Phase and Input Offset Calibration An On-Chip Temperature Sensor ( 3 C Typical after Calibration) An SPI-Compatible Serial Interface A Pulse Output with Programmable Frequency An Interrupt Request Pin (IRQ) and Status Register Provide Early Warning of Register Overflow and Other Conditions Proprietary ADCs and DSP Provide High Accuracy over Large Variations in Environmental Conditions and Time Reference 2.4 V 8% (20 ppm/ C Typical) with External Overdrive Capability Single 5 V Supply, Low Power (25 mW Typical) *U.S. Patents 5,745,323; 5,760,617; 5,862,069; 5,872,469; other pending. GENERAL DESCRIPTION The ADE7756 is a high-accuracy electrical power measurement IC with a serial interface and a pulse output. The ADE7756 incorporates two second-order sigma-delta ADCs, reference circuitry, temperature sensor, and all the signal processing required to perform active power and energy measurement. The ADE7756 contains a sampled Waveform register and an Active Energy register capable of holding at least five seconds of accumulated power at full load. Data is read from the ADE7756 via the serial interface. The ADE7756 also provides a pulse output (CF) with a frequency that is proportional to the active power. In addition to real power information, the ADE7756 also provides system calibration features, i.e., channel offset correction, phase calibration, and power calibration. The part also incorporates a detection circuit for short duration low voltage variations or sags. The voltage threshold level and the duration (in number of half- line cycles) of the variation are user programmable. An open drain logic output ( SAG) goes active low when a sag event occurs. A zero crossing output (ZX) produces an output that is synchro- nized to the zero crossing point of the line voltage. This output can be used to extract timing or frequency information from the line. The signal is also used internally to the chip in the calibration mode. This permits faster and more accurate calibration of the real power calculation. This signal is also useful for synchronization of relay switching with a voltage zero crossing, thus improving the relay life by reducing the risk of arcing. The interrupt request output is an open drain, active low logic output. The IRQ output will become active when the accumu- lated real power register is half-full and also when the register overflows. A status register indicates the nature of the interrupt. The ADE7756 is available in 20-lead DIP and 20-lead SSOP packages. |
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