基于LaunchPAD MSP430G2553的应用电路板设计
关键词： 应用电路板；AD/DA变换；低功耗；低成本；高效率
A Prototyping Board Based On Launch PAD MSP430G2553
Abstract: This article describes a prototyping board based on MSP430G2553 microcontroller. The board can be used in microcomputer principle simulation experiment, can also be used in electronic alarm clock, hour meter and the other electronic products. The board includes AD / DA module, 5110 LCD module, two digital tubes, eight light-emitting tubes. Using the MCU’s own AD module with a linear circuit of partial pressure to achieve AD conversion function, this improves the utilization of resource greatly. Through the use of LMV342 with a dual-channel rail-to-rail chip to achieve the DA module, that doesn’t only saves resources but also improves the adjustable voltage range to make sure the system is more reliable and can get more accurate data. Moreover, the design heritage with three main concepts: low-power, low-cost, high efficiency from the beginning to the end.
Key words: application board; AD / DA conversion; low power; low cost; high efficiency
目 录
1．引言 1
2．系统构建概述 2
2.1 设计方案 2
2.2 G2553及Launch PAD 3
2.3 应用板的系统构成和工作过程 4
3．软件开发平台 5
4．DA转换模块设计 7
4.1 DA转换电路设计 7
4.2 LMV342芯片内部构造及功能介绍 7
4.3 DA转换电路原理图 8
4.4 DA转换电路仿真 8
4.5 DA转换电路板测试 10
5．显示模块设计 14
5.1 八组发光管 14
5.2 两位数码管 15
5.3 液晶显示模块 16
6．AD转换模块设计 19
6.1 AD转换电路设计 19
6.2 单片机内置AD转换模块介绍 19
6.3 AD转换电路仿真 20
6.4 AD转换电路万能板测试 21
7．按键模块设计 22
7.1 薄膜按键 22
7.2 电容式触摸按键 24
8．产品优化设计 26
8.1 PCB图设计与制作 26
8.2 PCB图优化与升级 30
8.3 外表及结构设计 30
8.4 电路板连接图 32
9．程序设计 33
9.1 呼吸灯演示程序 33
9.2 长短按键程序 34
9.3 跑马灯程序 35
9.4 温度检测程序 37
9.5 LCD5110驱动程序 38
10．总结与分析 39
致 谢 40
参考文献 41
附录：实验原理图和PCB图附图 42
1．引言
现代化工业对开发板的要求越来越高，对低功耗模式下开发板的运行情况、对在不同温度环境下开发板的出错率等指标都有着严格的要求，而对于电子信息时代产品更迭频繁的状况下，掌握常用开发板的研究技术正是支撑现代化工业自动化的一项基础性技术措施 。稳定高效自动化设备是工业开发的必要因素之一。因此，如何提高开发板的利用效率，降低开发板以及系统的功耗，提高工业生产效率，是当前极为迫切的问题。