基于MCF51EM256設計的多相智能電表技術
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The MCF51EM256/128 series microcontrollers are a member of the ColdFire® family of reduced instruction set computing (RISC) microprocessors.
This document provides an overview of these 32-bit microcontrollers, focusing on their highly integrated and diverse feature set.
These microcontrollers are systems-on-chips (SoCs) that are based on the V1 ColdFire core and the following features:
Operating at processor core speeds up to 50.33 MHz (peripherals operate at half of
this speed) at 3.6 V to 2.5 V and 20 MHz at 2.5 V to 1.8 V
Up to 256 KB of flash memory
Up to 16 KB of RAM
Less than 1.3 μA of typical power consumption in battery mode, with MCU supply off
Ultra-low power independent RTC with calendar features, separate time base, power domain, and 32 bytes of RAM
A collection of communications peripherals, including UART, IIC and SPI
Integrated 16-bit SAR analog-to-digital converter
Programmable delay block (PDB)
Two analog comparators with selectable interrupt (PRACMP)
LCD driver
Three serial communications interface modules (SCI)
Three serial peripheral interfaces
Inter-integrated circuit (IIC)
Two 8-bit and one 16-bit modulo timers (MTIM)
Two-channel timer/PWM module (TPM)
MCF51EM256目標應用:
Smart Metering
Sensor collect
Phase Measurement Units
Industrial energy measurement
1- phase 3- phase electricity meters
圖1.MCF51EM256系列方框圖
基于MCF51EM256的多相智能電表參考設計
The polyphase reference design is a cost-optimized implementation of a 1-phase or 3-phase 110V and 230V smart electricity meter. The reference design contains all of the necessary hardware and software to make the development of production smart meters quick and easy, including pre-compliance test data is to help with the certification process. It is based on the MCF51EM256 ColdFire® MCU and is designed to meet US ANSI C12, Euro/Asia IEC62053 standards up to and beyond class 0.5
多相智能電表參考設計主要特性:
Complete solution for 1-phase, 3-phase, 110V and 230V electricity meters for all global regions
Able to achieve class 0.5 or better for active energy
Enables rapid development and deployment of a production meter
Full documentation including pre-compliance test data is available, to simplify and speed certification process
Software source code is supplied as a CodeWarrior project for easy re-use:
Direct use in a metering application
Customization and extension
Use of individual modules in other projects
Full working reference design is available for loan and evaluation
Designed and tested against:
IEC 62053-22 International Energy Metering Specification, class 0.5 (or better) for active energy
IEC 62053-23 International Energy Metering Specification, class 2 for reactive energy
IEC 62056-21 International Energy Metering data exchange Specification
IEC 62053-22, IEC 62053-23, IEC 62052-11 Electro Static Discharge (ESD), tested per IEC 61000-4
圖2.多相智能電表參考設計方框圖
基于MCF51EM256的多相智能電表(220V)指標:
MCF51EM256-based Poly Phase Energy Meter Reference Design 220V Technical Specifications
Environmental
Compliance IEC 60529
Ingress protection IP 51 (Indoor type meter)
Operating Temperature -25℃ to +55℃
Storage Temperature -25℃ to +70℃
Humidity 95%
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