GENERAL DESCRIPTION

The 71M6545/71M6545H metrology processors are based on Teridian’s 4th-generation metering architecture supporting the 71M6xxx series of isolated current sensing products that offer drastic reduction in component count, immunity to magnetic tampering, and unparalleled reliability. The 71M6545/71M6545H integrate our Single Converter Technology® with a 22-bit delta-sigma ADC, a customizable 32-bit computation engine (CE) for core metrology functions, as well as a user-programmable 8051-compatible application processor (MPU) core with up to 64KB flash and up to 5KB RAM.

An external host processor can access metrology functions di-rectly through the SPI™ interface, or alternatively through the embedded MPU core in applications requiring metrology data capture, storage, and preprocessing within the metrology subsystem. In addition, the devices integrate an RTC, DIO, and UART. A complete array of ICE and development tools, programming libraries, and reference designs enable rapid development and certification of meters that meet all ANSI and IEC electricity metering standards worldwide.

FEATURES

• Up to < 0.1 Accuracy Over 2000:1 Current Range

• Exceeds IEC 62053/ANSI C12.20 Standards

• Seven Sensor Inputs with Neutral Current Measurement, Differential Mode Selectable for Current Inputs

• Selectable Gain of 1 or 8 for One Current Input to Support Shunts

• High-Speed Wh/VARh Pulse Outputs with Programmable Width

• Flash/RAM Size

32KB/3KB (71M6545)

64KB/5KB (71M6545H)

• Up to Four Pulse Outputs with Pulse Count

• Four-Quadrant Metering, Phase Sequencing

• Digital Temperature Compensation

Metrology Compensation

Accurate RTC for TOU Functions with Automatic Temperature Compensation for Crystal in All Power Modes

• Independent 32-Bit Compute Engine

• 46–64Hz Line Frequency Range with the Same Calibration

• Phase Compensation (±7°)

• 1μA Supply Current in Sleep Mode

• Flash Security

• In-System Program Update

• 8-Bit MPU (80515), Up to 5 MIPS, for Optional Implementation of Postprocessing and Host Support Functions (Optional Use)

• Up to 29 DIO Pins

• Hardware Watchdog Timer (WDT)

• I2C/MICROWIRE® EEPROM Interface

• SPI Interface for Host:

Full Access to Shared Memory Space

Flash Program Capability

• UART

• Industrial Temperature Range

• 64-Pin Lead(Pb)-Free LQFP Package