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The ADE75181 integrates the Analog Devices, Inc., energy (ADE) metering IC analog front end and fixed funcTIon DSPsoluTIon with an enhanced 8052 MCU core, an RTC, an LCDdriver, and all the peripherals to make an electronic energy meter with an LCD display in a single part. The ADE measurement core includes acTIve, reacTIve, and apparentenergy calculations, as well as voltage and current rms measure-ments. This information is ready to use for energy billing by usingbuilt-in energy scalars. Many power line supervisory features,such as SAG, peak, and zero crossing, are included in the energy measurement DSP to simplify energy meter design.