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71M6521DE/DH/FE Energy Meter ICs


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 single-phase 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. A complete array of ICE and development tools, programming libraries, and reference designs enable rapid development and certification of TOU, AMR, and prepay meters that comply with worldwide electricity metering standards.


  • Up to 0.1% Wh Accuracy Over 2000:1 Current Range
  • Exceeds IEC 62053/ANSI C 12.20 Standards
  • Voltage Reference < 40 ppm/°C (< 20ppm/°C for 71M6521DH)
  • Four Sensor Inputs—VDD Referenced
  • Low-Jitter Wh and VARh Pulse Test Outputs (10kHz max)
  • PulseCount forPulse Outputs
  • Four-Quadrant Metering
  • Tamper Detection Neutral Current with CT or Shunt
  • Line Frequency Count for RTC
  • Digital Temperature Compensation
  • Sag Detection for Phase A and B
  • Independent 32-Bit Compute Engine
  • 46-64Hz Line Frequency Range with Same Calibration
  • Phase Compensation (±7°)
  • Battery backup for RTC and battery monitor
  • Three Battery Modes with Wake-Up on Pushbutton or Timer: Brownout Mode (48μA)LCD Mode (5.7μA)Sleep Mode (2.9μA)
  • Energy Display on Main Power Failure
  • Wake-Up with Pushbutton
  • 22-Bit Delta-Sigma ADC
  • 8- Bit MPU (80515), 1 Clock Cycle per Instruction with Integrated ICE for MPU Debug
  • RTC with Temperature Compensation
  • Auto-Calibration
  • Hardware Watchdog Timer, Power-Fail Monitor
  • LCD Driver (Up to 152 Pixels)
  • Up to 18 General-Purpose I/O Pins
  • 32kHz Time Base
  • 16KB (6521DE/DH) or 32KB (6521FE) Flash with Security
  • Two UARTs for IR and AMR
  • Digital I/OPins Compatible with 5V Inputs
  • 64-PinLQFP or 68-Pin QFN Package
  • Lead(Pb)-Free Packages