71M6521FE

19-5370; Rev 3; 7/12 71M6521DE/DH/FE Energy Meter ICs DATA SHEET GENERAL DESCRIPTION The Teridian™ 71M6521DE/DH/FE energy meter ICs are highly integrated systems-on-a-chip (SoCs) with an MPU core, RTC, flash, and LCD driver. The Single Converter Technology® with a 22-bit delta-sigma ADC, four analog inputs, digital temperature compensation, precision voltage reference, battery voltage monitor, and 32-bit computation engine (CE) supports a wide range of residential metering applications with very few low-cost external components. A 32kHz crystal time base for the entire system and internal battery-backup support for RAM and RTC further reduce system cost. The ICs support 2-wire, 3-wire, and 4-wire singlephase and dual-phase residential metering along with tamper-detection mechanisms. Maximum design flexibility is provided by multiple UARTs, I2C, MICROWIRE®, up to 18 DIO pins, and in-system programmable flash memory, which can be updated with data or application code in operation. ...