The Teridian 71M6533 and 71M6534 are third‑generation polyphase metering system‑on‑chips that integrate an analog front end, a 32‑bit computation engine, an 8051‑compatible MPU, flash, RAM, RTC, LCD driver and multiple I/O interfaces. They support a wide range of metering applications with very few external components and meet ANSI and IEC electricity metering standards.
Key features include <0.1 % Wh accuracy over a 2000:1 range, seven sensor inputs with neutral current measurement, low‑power sleep modes, SPI and I²C EEPROM interfaces, and configurable LCD drivers. The devices are offered in 100‑pin (71M6533/G/H) and 120‑pin (71M6534/H) LQFP packages for industrial temperature ranges.
| Accuracy | < 0.1 % over 2000:1 range |
|---|---|
| RAM | 4 KB shared RAM |
| Typical Power Consumption | 39 mW at 3.3 V |
| Multifunction DIO Pins | 4 dedicated + 35 (71M6533) or 48 (71M6534) |
| Sleep Current (Brownout Mode) | 82 µA typ |
| Analog Inputs | Seven sensor inputs with neutral current measurement |
| Maximum MPU Clock | 10 MHz |
The brownout mode draws 82 µA typical current.
It provides seven sensor inputs with neutral current measurement.
The MPU core can run up to 10 MHz.