STC89C52单片机列车车载直流恒流源设计+电路图+程序
毕业论文关键词：单片机STC89C52，数码管显示，TLC5615
ABSTRACT
With the progress of the times and the development of science and technology,the application of DC constant current source is more and more extensive.However, the numerical control technology is integrated into the constant current source,in order to manually set the output current and the digital display of the current,is a notable feature of the new generation of constant current source.The design is based on a steady flow of DC power microcontroller design, hardware part is STC89C52 microcontroller-based controller, ten D / A converter TLC5615, Digital Tube display Module, 3 * 1 button control module to achieve the current settings, control, output and display. D / A converter converts the digital signal into an analog signal through D / A output voltage as the reference voltage constant current source, the output current is displayed on the Digital tube. C programming language software selection, to achieve its function more easily. The structure of the system is simple and,the accuracy is high, low power consumption, can work in low-voltage 3V voltage can choose 3 ~ 5V voltage supply.
Keywords: microcontroller STC89C52,Digital Tube Display Module , TLC5615
目 录
1 绪论 1
1.1 课题背景与研究意义 1
1.2 国内外研究现状 1
1.3 本文的主要工作与内容安排 2
2 恒流源总体方案设计 3
2.1 总体方案设计 3
2.1.1 系统总体设计 3
2.1.2 性能指标 4
2.2 元器件的选择 4
2.2.1 主控器 4
2.2.2 供电电源 5
2.2.3 恒流源 5
2.2.4 DAC方案论证 6
2.2.5 控制单元方案选择 7
2.2.6 显示 7
3 系统硬件设计 8
3.1 单片机最小系统设计 8
3.1.1 主要功能 8
3.1.2 引脚功能 9
3.2 电源模块 12
3.3 D/A模块设计 12
3.3.1 内部功能 13
3.3.2 引脚功能 13
3.3.3 工作时序 14
3.4 按键原理 16
3.5 恒流源电路设计 17
3.6 显示电路 18
4 系统软件设计 20
4.1 系统软件的结构 20
4.2 编程软件介绍 20
4.3 系统软件流程 21
4.3.1 主程序流程图 21
4.3.2 按键控制程序设计 22
4.3.3 显示子程序设计 22
5 仿真与系统功能测试 24
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