TI公司的MSP430F471x3, MSP430F471x6和MSP430F471x7是超低功耗混合信號微控制器,集成了三個,六個或七個16位sigma-delta ADC,兩個16位定時器,四個通用串行通信接口(USCI),DMA,68個I/O引腳以及帶對比控制的LCD驅動器,每路有差分輸入對和可編程輸入增益, 工作電壓1.8 V 到3.6 V,工作模式在1MHz/2.2V是的功耗為350uA,待機模式為1.1uA,關斷模式為0.2uA,主要用于電表和手持測量儀表.本文介紹了MSP430F471xx主要特性,方框圖以及三相四線星形連接的電表框圖和電路圖.
The Texas InstrumentsMSP430 family of ultralow-power microcontrollers consists of several devices featuring different sets of peripherals targeted for various applications. The architecture, combined with five low-power modes, is optimized to achieve extended battery life in portable measurement applications. The devices feature a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency.The digitally controlled oscillator (DCO) allows wake-up from low-power modes to active mode in less than 6us.
The MSP430F471xx series are microcontroller configurations targeted to single-phase and poly-phase electricity meters with three, six, or seven 16-bit sigma-delta A/D converters. Each channel has a differential input pair and programmable input gain. Also integrated are two 16-bit timers, four universal serial communication interfaces (USCI), DMA, 68 I/O pins, and a liquid crystal driver (LCD) with integrated contrast control.
MSP430F471xx主要特性:
D Low Supply-Voltage Range: 1.8 V to 3.6 V
D Ultralow Power Consumption
-- Active Mode: 350uA at 1 MHz, 2.2 V
-- Standby Mode: 1.1 uA
-- Off Mode (RAM Retention): 0.2 uA
D Five Power-Saving Modes
D Wake-Up From Standby Mode in Less Than 6us
D 16-Bit RISC Architecture, 62.5-ns Instruction Cycle Time
D Three-Channel Internal DMA
D Three, Six or Seven 16-Bit Sigma-Delta Analog-to-Digital (A/D) Converters With Differential PGA Inputs
D 16-Bit Timer_B With Three Capture/Compare-With-Shadow Registers
D 16-Bit Timer_A With Three Capture/Compare Registers
D On-Chip Comparator
D Four Universal Serial Communication Interface (USCI) Modules
-- USCI_A0 and USCI_A1
-- Enhanced UART Supporting Auto-Baudrate Detection
-- IrDA Encoder and Decoder
-- Synchronous SPI
-- USCI_B0 and USCI_B1
-- I2C
-- Synchronous SPI
D Integrated LCD Driver With Contrast Control for Up to 160 Segments
D Basic Timer With Real-Time Clock Feature
D 32-Bit Hardware Multiplier
D Brownout Detector
D Supply Voltage Supervisor/Monitor With Programmable Level Detection
D Serial Onboard Programming, No External Programming Voltage Needed Programmable Code Protection by Security Fuse
D Bootstrap Loader
D On-Chip Emulation Module
D Family Members Include
MSP430F47163: 92KB Flash, 4KB RAM
3 Sigma-Delta ADCs
MSP430F47173: 92KB Flash, 8KB RAM
3 Sigma-Delta ADCs
MSP430F47183: 116KB Flash, 8KB RAM
3 Sigma-Delta ADCs
MSP430F47193: 120KB Flash, 4KB RAM
3 Sigma-Delta ADCs
MSP430F47126: 56KB Flash, 4KB RAM
6 Sigma-Delta ADCs
MSP430F47166: 92KB Flash, 4KB RAM
6 Sigma-Delta ADCs
MSP430F47176: 92KB Flash, 8KB RAM
6 Sigma-Delta ADCs
MSP430F47186: 116KB Flash, 8KB RAM
6 Sigma-Delta ADCs
MSP430F47196: 120KB Flash, 4KB RAM
6 Sigma-Delta ADCs
MSP430F47127: 56KB Flash, 4KB RAM
7 Sigma-Delta ADCs
MSP430F47167: 92KB Flash, 4KB RAM
7 Sigma-Delta ADCs
MSP430F47177: 92KB Flash, 8KB RAM
7 Sigma-Delta ADCs
MSP430F47187: 116KB Flash, 8KB RAM
7 Sigma-Delta ADCs
MSP430F47197: 120KB Flash, 4KB RAM
7 Sigma-Delta ADCs
D Available in a 100-Pin Plastic Quad
Flatpack (QFP) Package
圖1. MSP430F471x7方框圖
圖2. MSP430F471x6方框圖
圖3. MSP430F471x3方框圖
采用MSP430F471xx的三相電度(瓦特-小時)表
This application report describes the implementation of a three phase electronic electricity
meter using the Texas Instruments MSP430F471xx system-on-chip (SOC) processor.
This application report includes the necessary information with regard to metrology software, hardware and calibration procedures for this single chip implementation. Results are included at the end, which show performance of this device for three phase using current transformers as sensors.
圖4.采用MSP430F47197的三相四線星形連接的電度表框圖
圖5. MSP430電表的容性電源電路圖
圖6. MSP430電表的基于變壓器電源電路圖
圖7.三相電表EVM外形圖
圖8.三相電表EVM電路圖
詳情請見:
http://www.ti.com/lit/ds/symlink/msp430f47197.pdf
和
http://www.ti.com/lit/an/slaa409a/slaa409a.pdf
