TI公司的Stellaris LM4F232H5QD是基于ARM Cortex™-M4F處理器核的32位MCU,工作頻率80MHz,集成了系統定時器(SysTick),嵌套的向量中斷控制器(NVIC),帶時鐘門的叫醒中斷控制器(WIC),存儲器保護單元(MPU), IEEE754兼容的單精度浮點單元(FPU)等,用于外設的8/16/32位專用并行總線,支持SDRAM,SRAM/閃存,FPGA和CPLD,主要用在低功耗手持智能設備,游戲機,家庭和商用定點監視和控制,運動控制,醫療儀器,測試測量設備,工廠自動化,防火和安全系統,智能電網,智能照明控制和交通.本文介紹了LM4F232H5QD MCU主要特性和方框圖, 評估板EK-LM4F232主要特性和方框圖,電路圖,材料清單和PCB元件布局圖.
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
圖1. Stellaris® LM4F232方框圖
圖2.Stellaris LM4F232H5QD MCU詳細方框圖
Stellaris LM4F232H5QD MCU主要特性:
Stellaris® LM4F232評估板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.
圖3.評估板EK-LM4F232外形圖
評估板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
圖4.評估板EK-LM4F232方框圖
圖5.評估板EK-LM4F232方框圖(1)
圖6.評估板EK-LM4F232方框圖(2)
圖7.評估板EK-LM4F232方框圖(3)
圖8.評估板EK-LM4F232方框圖(4)
圖9.評估板EK-LM4F232方框圖(5)
圖10.評估板EK-LM4F232 PCB元件布局圖:頂層
圖11.評估板EK-LM4F232 PCB元件布局圖:底層
評估板EK-LM4F232材料清單(BOM):
詳情請見:
http://www.ti.com/lit/ds/spms319b/spms319b.pdf
和
http://www.ti.com/lit/ug/spmu272/spmu272.pdf
