71M6541D/F/G and 71M6542F/G
Energy Meter ICs
GENERAL DESCRIPTION
FEATURES
The 71M6541D/71M6541F/71M6541G/71M6542F/71M6542G are
4th-generation single-phase metering SoCs with a 5MHz 8051-
compatible MPU core, low-power RTC with digital temperature
compensation, flash memory, and LCD driver. Our Single Converter
Technology® with a 22-bit delta-sigma ADC, three or four analog
inputs, digital temperature compensation, precision voltage reference,
and a 32-bit computation engine (CE) supports a wide range of
metering applications with very few external components.
• 0.1% Typical Accuracy Over 2000:1 Current
Range
• Exceeds IEC 62053/ANSI C12.20 Standards
• Two Current Sensor Inputs with Selectable
Differential Mode
• Selectable Gain of 1 or 8 for One Current Input to
Support Shunts
• High-Speed Wh/VARh Pulse Outputs with
Programmable Width
The 71M6541/2 devices support optional interfaces to the 71M6x01
series of isolated sensors, which offer BOM cost reduction, immunity
to magnetic tamper, and enhanced reliability. Other features include
an SPI interface, advanced power management, ultra-low-power
operation in active and battery modes, 3/5KB shared RAM and
32/64/128KB of flash memory that can be programmed in the field
with code and/or data during meter operation and the ability to drive
up to six LCD segments per SEG driver pin. High processing and
sampling rates combined with differential inputs offer a powerful
metering platform for residential meters.
• 32KB Flash, 3KB RAM (71M6541D)
• 64KB Flash, 5KB RAM (71M6541F/42F)
• 128KB Flash, 5KB RAM (71M6541G/42G)
• Up to Four Pulse Outputs with Pulse Count
• Four-Quadrant Metering
• Digital Temperature Compensation:
-
-
Metrology Compensation
A complete array of code development tools, demonstration code,
and reference designs enable rapid development and certification of
meters that meet all ANSI and IEC electricity metering standards
worldwide.
Accurate RTC for TOU Functions with
Automatic Temperature Compensation for
Crystal in All Power Modes
• Independent 32-Bit Compute Engine
Shunt
• 46-64Hz Line Frequency Range with the Same
NEUTRAL
Calibration
LOAD
Note:
Shunt
LINE
This system is referenced to LINE
• Phase Compensation (±10°)
• Three Battery-Backup Modes:
NEUTRAL
POWER SUPPLY
-
-
-
Brownout Mode (BRN)
LCD Mode (LCD)
Sleep Mode (SLP)
LINE
• Wake-Up on Pin Events and Wake-On Timer
71M6xx1
MUX and ADC
V3P3A V3P3SYS
GNDA GNDD
• 1µA in Sleep Mode
PWR MODE
CONTROL
IAP
IAN
• Flash Security
WAKE-UP
Pulse
Trans-
former
71M6541D/F/G
REGULATOR
BATTERY
• In-System Program Update
• 8-Bit MPU (80515), Up to 5 MIPS
• Full-Speed MPU Clock in Brownout Mode
• LCD Driver:
VBAT
VA
VBAT_RTC
RTC
BATTERY
BATTERY
MONITOR
IBP
IBN
TEMPERATURE
SENSOR
VREF
RAM
COM0...5
SEG
LCD DISPLAY
SERIAL PORTS
COMPUTE
ENGINE
8888.8888
TX
RX
SEG/DIO
- Up to 6 Commons/Up to 56 Pins
• 5V LCD Driver with DAC
AMR
IR
LCD DRIVER
DIO, PULSES
FLASH
MEMORY
PULSES,
DIO
DIO
MODUL-
RX
ATOR
TX
I2C or µWire
EEPROM
• Up to 51 Multifunction DIO Pins
• Hardware Watchdog Timer (WDT)
• I2C/MICROWIRE® EEPROM Interface
• SPI Interface with Flash Program Capability
• Two UARTs for IR and AMR
• IR LED Driver with Modulation
• Industrial Temperature Range
POWER FAULT
COMPARATOR
MPU
RTC
TIMERS
V3P3D
OSCILLATOR/
PLL
XIN
SPI INTERFACE
32 kHz
HOST
ICE
XOUT
11/5/2010
• 64-Pin (71M6541D/F/G) and 100-pin
(71M6542F/G) Lead(Pb)-Free LQFP Package
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.
19-5376; Rev 4; 3/14