This document describes the features and characteristics of Teridian™ 4th-generation single-phase metering SoCs 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G, including a 5MHz 8051-compatible MPU core, low-power RTC with digital temperature compensation, flash memory, and LCD driver, supporting a wide range of metering applications.
The 71M6541D/F/G and 71M6542F/G are 4th‑generation single‑phase metering System‑on‑Chip devices from Maxim. They integrate a 5 MHz 8051‑compatible MPU core, a 22‑bit delta‑sigma ADC, flash memory, RAM, LCD driver and extensive peripheral interfaces for energy‑metering applications.
The document provides full functional descriptions, hardware overviews, pin‑out diagrams, electrical specifications, and recommended operating conditions. It also includes tables of registers, timing specifications, and battery‑backup mode details for designers developing residential or commercial meters.
| Accuracy | 0.1 % over 2000:1 current range |
|---|---|
| Core processor | 5 MHz 8051‑compatible MPU |
| ADC resolution | 22‑bit delta‑sigma |
| Flash memory (71M6541D) | 32 KB |
| RAM (71M6541D) | 3 KB |
| LCD segment drive | up to 6 segments per SEG driver pin |
It uses a 5 MHz 8051‑compatible MPU core.
Up to six LCD segments can be driven per SEG driver pin.
The devices support three battery‑backup modes: Brownout, LCD, and Sleep.
They achieve 0.1 % accuracy over a 2000:1 current range.