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. They support a wide range of residential metering applications with features such as a 22-bit delta-sigma ADC, four analog inputs, digital temperature compensation, precision voltage reference, battery voltage monitor, and 32-bit computation engine (CE).
The Maxim 71M6521DE/DH/FE family are highly integrated energy‑meter system‑on‑chip devices that combine an 80515 MPU core, RTC, flash memory, LCD driver and a 22‑bit delta‑sigma ADC. They support single‑ and dual‑phase residential metering with up to four analog sensor inputs, digital temperature compensation, and extensive UART, MICROWIRE and GPIO interfaces.
The data sheet provides a complete hardware description, functional block diagrams, register maps, timing specifications, and recommended external components. It also includes performance tables such as accuracy, voltage reference stability, power‑fault monitoring and battery‑backup operation for the RTC.
| Energy Accuracy | up to 0.1% Wh over 2000:1 current range |
|---|---|
| Voltage Reference Accuracy | < 40 ppm/°C (20 ppm/°C for DH) |
| ADC Resolution | 22‑bit Delta‑Sigma |
| MPU Core | 8‑bit 80515, 1 clock cycle per instruction |
| Flash Memory Size | 16 KB (DE/DH) or 32 KB (FE) |
| MPU XRAM | 2 KB |
| GPIO Pins | up to 18 general‑purpose I/O |
| Package Options | 64‑pin LQFP or 68‑pin QFN |
| Time Base | 32 kHz crystal |
| Battery Backup | supports RTC and voltage monitor |
The ADC is a 22‑bit delta‑sigma converter.
Two UARTs are available for IR and AMR communication.
The DE/DH versions have 16 KB of flash, while the FE version has 32 KB.
The voltage reference is specified at less than 40 ppm/°C, and 20 ppm/°C for the DH variant.