原标题：TI Stellaris LM4F232 32位MCU开发方案

　　TI公司的Stellaris LM4F232H5QD是基于ARM Cortex™-M4F处理器核的32位MCU,工作频率80MHz,集成了系统定时器(SysTick),嵌套的向量中断控制器(NVIC),带时钟门的叫醒中断控制器(WIC),存储器保护单元(MPU), IEEE754兼容的单精度浮点单元(FPU)等,用于外设的8/16/32位专用并行总线,支持SDRAM,SRAM/闪存,FPGA和CPLD,主要用在低功耗手持智能设备,游戏机,家庭和商用定点监视和控制,运动控制,医疗仪器,测试测量设备,工厂自动化,防火和安全系统,智能电网,智能照明控制和交通.本文介绍了LM4F232H5QD MCU主要特性和方框图, 评估板EK-LM4F232主要特性和方框图,电路图,材料清单和PCB元件布局图.

　　Texas Instruments is the industry leader in bringing 32-bit capabilities and the full benefits of ARM? Cortex™-M-based microcontrollers to the broadest reach of the microcontroller market. For current users of 8- and 16-bit MCUs, Stellaris?with Cortex-M offers a direct path to the strongest ecosystem of development tools, software and knowledge in the industry. Designers who migrate to Stellaris benefit from great tools, small code footprint and outstanding performance. Even more important, designers can enter the ARM ecosystem with full confidence in a compatible roadmap from $1 to 1 GHz. With blazingly-fast responsiveness, Thumb-2 technology combines both 16-bit and 32-bit instructions to deliver the best balance of code density and performance. Thumb-2 uses 26 percent less memory than pure 32-bit code to reduce system cost while delivering 25 percent better performance. The Texas Instruments Stellaris family of microcontrollers brings high-performance 32-bit computing to cost-sensitive embedded microcontroller applications.

　　The Stellaris LM4F series of ARM Cortex-M4 microcontrollers provides top performance and advanced integration. The product family is positioned for cost-conscious applications requiring significant control processing and connectivity capabilities such as:

　　■ Low power, hand-held smart devices

　　■ Gaming equipment

　　■ Home and commercial site monitoring and control

　　■ Motion control

　　■ Medical instrumentation

　　■ Test and measurement equipment

　　■ Factory automation

　　■ Fire and security

　　■ Smart Energy/Smart Grid solutions

　　■ Intelligent lighting control

　　■ Transportation

　　图1. Stellaris® LM4F232方框图

　　图2.Stellaris LM4F232H5QD MCU详细方框图

　　Stellaris LM4F232H5QD MCU主要特性:

　　Stellaris® LM4F232评估板EK-LM4F232

　　The Stellaris® LM4F232 Evaluation Board (EK-LM4F232) is an evaluation platform for the Stellaris LM4F232H5QD ARM® Cortex™-M4F-based microcontroller. The evaluation board’s design highlights the LM4F232H5QD microcontroller’s USB 2.0 On-The-Go/Host/Device (USB OTG/Host/Device) interface, 12-bit Analog-to-Digital Converter (ADC), Real-Time Clock (RTC), and battery-backed Hibernation module.

　　图3.评估板EK-LM4F232外形图

　　评估板EK-LM4F232包括:

　　The EK-LM4F232 evaluation kit comes with the following:

　　 Stellaris EK-LM4F232 evaluation board

　　 On-board Stellaris® In-Circuit Debug Interface (ICDI)

　　 Cables

　　– USB Mini-B to USB-A plug cable (for debug)

　　– USB Micro-A plug to USB-A receptacle cable

　　– USB Micro-B plug to USB-A plug cable

　　 USB Flash drive

　　 3 V CR2032 lithium coin cell battery

　　 CD containing:

　　– StellarisWare® Peripheral Driver Library and example source code

　　– Stellaris® Firmware Development Package with example source code

　　– Quickstart application with source code

　　• Windows companion application for quickstart application

　　– Complete documentation

　　– A supported version of one of the following:

　　• Keil™ RealView® Microcontroller Development Kit (MDK-ARM)

　　• IAR Embedded Workbench® development tools

　　• Sourcery CodeBench development tools

　　• Code Red Technologies development tools

　　• Texas Instruments’ Code Composer Studio™ IDE

　　The EK-LM4F232 evaluation kit includes the following features:

　　 Stellaris® LM4F232H5QD microcontroller

　　 Data logger demo application

　　– 6 screw terminals

　　• 4 analog inputs (0-20 V)

　　• Power

　　• Ground

　　– 3-axis analog accelerometer

　　– 2 Analog temperature sensors

　　• External TMP20 temperature sensor

　　• Internal microcontroller temperature sensor

　　– Microcontroller current shunt amplifier

　　 96 x 64 color OLED display

　　 USB Micro-AB connector for Host/Device/OTG

　　 microSD card slot

　　 5 user/navigation switches

　　 User LED

　　 Precision 3.0 V reference

　　 Available I/O brought out to headers on 0.1" grid

　　 Debug

　　– Stellaris® In-Circuit Debug Interface (ICDI)

　　– Standard 10-pin JTAG header

　　 Shunt resistors to measure current on VBAT and VDD

　　 Coin cell backup battery for Hibernate mode

　　 Reset button

　　图4.评估板EK-LM4F232方框图

　　评估板EK-LM4F232材料清单(BOM):