文档介绍：基于I2C总线的远程数据采集系统
摘要
针对远距离多点数据的采集,节省微处理器的输入输出引脚,满足多器件控制的要求,设计一套基于I2C总线的远程数据采集系统。本系统以带有I2C接口的LPC900系列单片机作为主控MCU,来实现数据的处理;以P82B96驱动器提高I2C总线的负载能力,提高传输距离从而实现数据的远程传输;以带有I2C接口的A/D转换器PCF8591来采集数据并进行数据类型的转换;以温度传感器AD590来测量环境温度;以LED驱动器ZLG7290驱动数码管显示数据。通过不断的调试和完善实现多点的温度测量,在数码管上显示即时温度。
本系统采用LPC922单片机为主控制器,通过I2C总线实现远距离的温度测量。本系统分为以下几个模块:微处理器核心模块、LED显示模块、键盘模块、温度测量模块、数据远距离传输模块、电源模块。
关键词:单片机,I2C总线,远程数据采集
I2C Bus-based Remote Data Acquisition System
ABSTRACT
For long-distance multi-point data collection, to save the input and output pins of the microprocessor, to meet the requirementsthe control of multiple devices, design a set of I2C bus based remote data acquisition system. The system interfaces with LPC900 MCU I2C as a master MCU, to achieve data processing; to P82B96 I2C bus drive to improve load capacity and improve transmission range in order to achieve the remote transmission of data; to I2C interface with A /D PCF8591 converter to capture data and perform data type conversions; to AD590 temperature sensor to measure ambient temperature; to drive ZLG7290 LED digital display driver data. Debug and improve through continuous multi-point temperature measurement, digital display in real-time temperature.
This system uses the LPC922 microcontroller-based controller, through the I2C bus for remote temperature measurements. The system is divided into the following modules: microprocessor core module, LED display module, keyboard module, temperature measurement module, remote data transmission module, power supply module.
KEY WORDS: microcontroller, I2C bus, remote data acquisition
目录
摘要 I
ABSTRACT II
1 绪论 1
1
I2C总线及优点 1
2 系统方案 3
系统方案简介 3
系统总体方案的确定 3
主控制器方案的选型 3
I2C扩展芯片的选型 4
温度传感器的选型 4
LCD液晶驱动器的选型 5
A/D转换器的选型 5
5
3 P89LPC922单片机及I2C接口 6
P89LPC922单片机概述 6
芯片内部框图 6
引脚配置 7
I/O口 7
I/O端口配置 8
准双向口输出配置 8
开漏输出配置 8
仅为输入配置 8
推挽输出配置 9
中断 9