ADE5166/ADE5169/ADE5566/ADE5569 are single-phase energy measurement ICs with built-in 8052 MCU, RTC and LCD driver. They support wide voltage range supply (2.4V to 3.7V), internal bipolar switch between regulated and battery inputs, ultra-low power operation with power saving modes (PSM), including full operation mode, battery mode, sleep mode, real-time clock (RTC) mode and RTC and LCD mode.