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71M6545/71M6545H

Metrology Processors

Shunt Resistor Sensors

GENERAL DESCRIPTION

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 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.

NEUTRAL

FEATURES

? 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

LOAD

POWER SUPPLY

This system is referenced to Neutral

NEUTRAL

? Independent 32-Bit Compute Engine

? 46–64Hz Line Frequency Range with the

Same Calibration

? Phase Compensation ( ± 7 ° )

? 1 μ A Supply Current in Sleep Mode

? Flash Security

} IN*

IADC7 } IC

} IB

} IA

71M6545/H

TEMPERATURE

SENSOR

RAM

MPU

M COMPUTE

ENGINE

PULSES

HOST

Pulse Transformers

SPI_CKI

SPI_DI

SPI_DO

SPI_CSZ

XFER_BUSY

SAG

MUX and ADC

IADC0

IADC1

VADC10 (VC)

IADC6

VADC9 (VB)

IADC4

IADC5

VADC8 (VA)

IADC2

IADC3

VREF

SERIAL PORT

FLASH

MEMORY

ICE

SPI INTERFACE

V3P3A V3P3SYS GNDA GNDD

PWR MODE

CONTROL

REGULATOR

VBAT_RTC

BATTERY

MONITOR

OSCILLATOR/

PLL XIN

XOUT

DIO, PULSES,

LEDs

RTC DIO

TIMERS

V3P3D

WPULSE

XPULSE

RPULSE

YPULSE

10/7/2010

RTC

BATTERY

32 kHz

DIO

I 2 C or μWire

EEPROM

3.3 VDC

? 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)

? I 2 C/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

*IN = Optional Neutral Current

Single Converter Technology is a registered trademark of Maxim Integrated Products, Inc.

MICROWIRE is a registered trademark of National Semiconductor Corp.

For pricing, delivery, and ordering information, please contact Maxim Direct at

1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.

19-5378; Rev 2; 10/13

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