资 源 简 介
The ADE7756 contains a sampled Waveform register and anAcTIve Energy register capable of holding at least five seconds ofaccumulated power at full load. Data is read from the ADE7756via 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 providessystem calibration features, i.e., channel offset correction, phasecalibration, and power calibration. The part also incorporates adetection circuit for short duration low voltage variations or sags.The voltage threshold level and the duration (in number of halflinecycles) of the variation are user programmable. An open drainlogic output (SAG) goes active low when a sag event occurs.A zero crossing output (ZX) produces an output that is synchronizedto the zero crossing point of the line voltage. This output canbe used to extract timing or frequency information from the line.The signal is also used internally to the chip in the calibrationmode. This permits faster and more accurate calibration of thereal power calculation. This signal is also useful for synchronizationof relay switching with a voltage zero crossing, thus improvingthe relay life by reducing the risk of arcing.The interrupt request output is an open drain, active low logicoutput. The IRQ output will become active when the accumulatedreal power register is half-full and also when the registeroverflows. A status register indicates the nature of the interrupt.The ADE7756 is available in 20-lead DIP and 20-leadSSOP packages.
