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# 实验三 A/D 接口模块 - PowerPoint PPT Presentation

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## PowerPoint Slideshow about ' 实验三 A/D 接口模块' - evan

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### 实验三 A/D接口模块

• 实验一
• 实验箱整体介绍
• ARM开发环境的搭建
• ARM开发流程
• 实验二
• 串口硬件电路
• UART寄存器
• 串口编程

• 学习A/D接口原理及硬件电路；
• 阅读实验指导书，了解ARM的A/D相关寄存器；
• 利用外部模拟信号编程，实现ARM循环采集全部前4路通道信号，并显示在超级终端上。

• 熟悉ARM本身自带的八路十位A/D控制器及相应寄存器；
• 编程实现ARM系统的A/D功能；
• 掌握带有A/D的CPU编程实现A/D功能的主要方法。
A/D转换的重要指标
• 分辨率(最小有效量程)
• 精度
• 转换时间
• 量程
• 工作温度
• 输出电平
• 电源灵敏度
A/D 转换
• A/D转换率－2410

freq = MCLK/( 转换因子+1)

t = 1/freq

• A/D转换率－ 44B0

freq = MCLK/（16×( 转换因子+1)）

t = 1/freq

• Vin = ADCDAT×Vref/2^n
• 例子：
• Vin ＝ ADCDAT×2.5/1024