The ADE7566/ADE7569/ADE7166/ADE71691 integrate Analog Devices, Inc., energy (ADE) metering IC analog front end and fixed function DSP solution with an enhanced 8052 MCU core, an RTC, an LCD driver, 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 apparent energy calculations, as well as voltage and current rms measure- ments. This information is ready to use for energy billing by using built-in energy scalars. Many power line supervisory features 1 Patents pending.