原标题：TI MSP430FR231x系列FRAM MCU开发方案

　　TI公司的MSP430FR231x系列是16位差低功耗铁电存储器(FRAM) MCU.铁电存储器具有SRAM的速度,灵活性和耐用性以及闪存的稳定性和可靠性,并且总功耗很低.16位RISC处理器工作频率高达16MHz,并集成了可配置低漏电电流传感放大器,16位寄存器,常数发生器.主要用在烟雾检测器,健康健身设备,消费电子,电源盒和电源监视.本文介绍了MSP430FR231x系列主要特性,框图,MSP430FR2311 LaunchPad开发板主要特性,框图和电路图.

　　The ultra-low-power MSP430FR231x FRAM microcontroller (MCU) family consists of several devices that feature embedded nonvolatile FRAM and different sets of peripherals targeted for various sensing and measurement applications. The architecture, FRAM, and peripherals, combined with extensive low-power modes, are optimized to achieve extended battery life in portable and wireless sensing applications. FRAM is a new nonvolatile memory that combines the speed, flexibility, and endurance of SRAM with the stability and reliability of flash, all at lower total power consumption.

　　The MSP430FR231x FRAM MCU is the world’s first microcontroller with a configurable low-leakage current sense amplifier and features a powerful 16-bit RISC CPU, 16-bit registers, and constant generators that contribute to maximum code efficiency. The digitally controlled oscillator (DCO) also allows the device to wake from low-power modes to active mode typically in less than 10 μs. Additionally, developers can reduce PCB real estate by up to 75 percent with integrated analog, EEPROM, crystal, and MCU functionality in a 3.5 mm × 4 mm package. The feature set of this microcontroller is ideal for applications ranging from smoke detectors to portable health and fitness accessories.

　　System-level ESD protection must be applied in compliance with the device-level ESD specification to prevent electrical overstress or disturbing of data or code memory. See (SLAA530) for more information.

　　MSP430FR231x系列主要特性:

　　Embedded Microcontroller

　　16-Bit RISC Architecture up to 16 MHz

　　Wide Supply Voltage Range From 1.8 V to 3.6 V [Operation voltage is restricted by SVS levels (see VSVSH- and VSVSH+)]

　　Optimized Low-Power Modes (at 3 V)

　　Active Mode: 126 µA/MHz

　　Standby:

　　LPM3.5 With VLO: 1 µA

　　Real-Time Clock (RTC) Counter (LPM3.5 With 32768-Hz Crystal): 1 µA

　　Shutdown (LPM4.5): 25 nA with SVS

　　Low-Power Ferroelectric RAM (FRAM)

　　Up to 3.75KB of Nonvolatile Memory

　　Built-In Error Correction Code (ECC)

　　Configurable Write Protection

　　Unified Memory of Program, Constants, and Storage

　　1015 Write Cycle Endurance

　　Radiation Resistant and Nonmagnetic

　　Intelligent Digital Peripherals

　　IR Modulation Logic

　　Two 16-Bit Timers With Three Capture/Compare Registers Each (Timer_B3)

　　One 16-Bit Counter-Only RTC Counter

　　16-Bit Cyclic Redundancy Checker (CRC)

　　Enhanced Serial Communications

　　Enhanced USCI A (eUSCI_A) Supports UART, IrDA, and SPI

　　Enhanced USCI B (eUSCI_B) Supports SPI and I2C

　　High-Performance Analog

　　8-Channel 10-Bit Analog-to-Digital Converter (ADC)

　　Internal 1.5-V Reference

　　Sample-and-Hold 200 ksps

　　Enhanced Comparator (eCOMP)

　　Integrated 6-Bit Digital-to-Analog Converter (DAC) as Reference Voltage

　　Programmable Hysteresis

　　Configurable High-Power and Low-Power Modes

　　Smart Analog Combo (SAC-L1)

　　Supports General-Purpose OA

　　Rail-to-Rail Input and Output

　　Multiple Input Selections

　　Configurable High-Power and Low-Power Modes

　　Transimpedance Amplifier (TIA) The transimpedance amplifier was originally given an abbreviation of TRI for use in descriptive text, pin names, and register names. The abbreviation has been changed to TIA in all descriptive text, but pin names and register names still use TRI.

　　Current-to-Voltage Conversion

　　Half-Rail Input

　　Low-Leakage Negative Input Down to 50 pA

　　Rail-to-Rail Output

　　Multiple Input Selections

　　Configurable High-Power and Low-Power Modes

　　Clock System (CS)

　　On-Chip 32-kHz RC Oscillator (REFO)

　　On-Chip 16-MHz Digitally Controlled Oscillator (DCO) With Frequency Locked Loop (FLL)

　　±1% Accuracy With On-Chip Reference at Room Temperature

　　On-Chip Very Low-Frequency 10-kHz Oscillator (VLO)

　　On-Chip High-Frequency Modulation Oscillator (MODOSC)

　　External 32-kHz Crystal Oscillator (LFXT)

　　External High-Frequency Crystal Oscillator up to 16 MHz (HFXT)

　　Programmable MCLK Prescalar of 1 to 128

　　SMCLK Derived From MCLK With Programmable Prescalar of 1, 2, 4, or 8

　　General Input/Output and Pin Functionality

　　16 I/Os on 20-Pin Package

　　12 Interrupt Pins (8 Pins of P1 and 4 Pins of P2) Can Wake MCU From LPMs

　　All I/Os are Capacitive Touch I/Os

　　Development Tools and Software

　　Free Professional Development Environments

　　Development Kit (MSP-TS430PW20)

　　Family Members

　　MSP430FR2311: 3.75KB of Program FRAM + 1KB of RAM

　　MSP430FR2310: 2KB of Program FRAM + 1KB of RAM

　　Package Options

　　20-Pin: TSSOP (PW20)

　　16-Pin: TSSOP (PW16)

　　16-Pin: QFN (RGY16)

　　MSP430FR231x系列应用:

　　Smoke Detectors

　　Power Banks

　　Portable Health and Fitness

　　Power Monitoring

　　Personal Electronics

　　图1.MSP430FR231x系列功能框图

　　MSP430FR2311 LaunchPad开发板

　　The MSP-EXP430FR2311 LaunchPad Development Kit is an easy-to-use microcontroller development board for the MSP430FR2311 MCU. It contains everything needed to start developing quickly on the MSP430FR2x FRAM platform, including on-board emulation for programming, debugging and Energy Measurements. The board features on-board buttons and LEDs for integration of a simple user interface and a Optical Sensor interface to get started with your development. The kit comes with a pre-programmed code for testing the light intensity and use of integrated Op-Amp. The MSP430FR2311 MCU device is the world’s first MCU with a configurable low-leakage current sense amplifier, with 50 pA current leakage and 4 KB of embedded FRAM (Ferroelectric Random Access Memory), a non-volatile memory known for its ultra-low-power, high endurance and high speed write access. The device also has integrated Smart Analog Features (integrated Op-Amp, Comparator, DAC and ADC) to help connect a variety of industrial sensors enabling single chip implementation for most sensing applications. Rapid prototyping is a snap thanks to 20-pin headers and a wide range of BoosterPack plug-in modules enabling technologies such as wireless connectivity, graphical displays, environmental sensing, and much more.

　　图2.MSP430FR2311 LaunchPad开发板外形图

　　MSP430FR2311 LaunchPad开发板主要特性:

　　MSP430 ULP FRAM-based MSP430FR2311 16-bit MCU 4KB FRAM

　　EnergyTrace available for ultra-low-power debugging

　　20 pin LaunchPad standard leveraging the BoosterPack ecosystem

　　Onboard eZ-FET emulation

　　1 button and 2 LEDs for User Interaction

　　Back-channel UART via USB to PC

　　Optical light sensing circuit

　　MSP430FR2311 LaunchPad开发板包括:

　　MSP-EXP430FR2311 LaunchPad Development Kit

　　Micro USB cable

　　Quick Start Guide