Metrology Processor 64-Pin LQFP Bulk

The 71M6545/71M6545H metrology processors are based on 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 directly 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.

• 0.1% Typical 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