以51系列单片机AT89S52为控制核心总线式智能流量计的设计
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密 惠 保
摘 要
该设计以51系列单片机AT89S52为控制核心,实现流量测量的基本控制功能。在设计系统时,为了更好地采用模块化设计法,分步的设计各个单元功能模块,系统的硬件部分可以分为最小系统、数据采集、人机交互界面和系统电源四大部分。最小系统部分主要包括AT89S52和扩展的外部数据存储器;数据采集部分由流量传感器、信号的前级处理和A/D转换部分组成,包括运算放大器AD620和A/D转换器;人机交互界面为键盘输入和点阵式液晶显示,主要使用ZLG7289键盘控制芯片和OCM4x
关键词:单片机;采样电路;A/D转换器;液晶显示
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ABSTRACT
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The design is based on the microcontroller AT89S52 system as the core to carry out the basic control function of the electronics steelyard. While designing the system, I adopt the mold piece method to divide the hardware of the system into four parts: the minimum system, sampling circuit, I/O interface and the system power supply. The minimum system mainly includes the AT89S52 and the expanded exterior data memory. Sampling circuit is comprised of a pressure sensor, a differential measuring amplifier AD620 and a A/D converter . With the usage of ZLG7289 keyboard control chip and OCM4*
Key words: microcontroller; sampling circuit; A/D converter;
LCD Manifestation [资料来源:THINK58.com]
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[来源:http://think58.com] [资料来源:http://www.THINK58.com]