目录摘要...................................................................................Error:ReferencesourcenotfoundAbstract.............................................................................Error:Referencesourcenotfound1绪论..........................................................................................................................................31.1数据采集系统及发展历程............................................................................................31.2I2C总线及优点.............................................................................................................32系统方案..................................................................................................................................42.1系统方案简介................................................................................................................42.2系统总体方案的确定....................................................................................................42.2.1主控制器方案的选型..........................................................................................42.2.2I2C扩展芯片的选型...........................................................................................42.2.3温度传感器的选型..............................................................................................42.2.4LCD液晶驱动器的选型.....................................................................................52.2.5A/D转换器的选型..............................................................................................52.3总结................................................................................................................................53P89LPC922单片机及I2C接口............................................................................................73.1P89LPC922单片机概述...............................................................................................73.1.1芯片内部框图......................................................................................................73.3.2引脚配置..............................................................................................................83.4I/O口..............................................................................................................................83.4.1I/O端口配置........................................................................................................93.4.2准双向口输出配置..............................................................................................93.4.3开漏输出配置......................................................................................................93.4.4仅为输入配置......................................................................................................93.4.5推挽输出配置......................................................................................................93.5中断................................................................................................................................93.6I2C总线接口...............................................................................................................103.6.1概述....................................................................................................................103.6.2I2C特...
