摘要
针对触摸屏AD采样在实际应用中采样易受干扰、测量值偏差较大等常见问题,给出一种基于ADS784的四线电阻式触摸屏接口电路设计。该接口电路由ADS7846实现对触屏数据的采样;由C8051F320的SPI串口产生对ADS7846的测量命令发送和测量数据读取。并以该接口电路在触摸屏系统中的一个实际应用为例,分析接口电路的常见问题并提出相应的解决方案。实际应用结果表明,该设计合理可行。
A design of 4-wire touch screen interface based on ADS7846 is proposed,in order to solve the problem that the analog to digital sample of touch screen is easily interfered and reduce the error of measured value.The interface circuit sample the data of touch screen by ADS7846,and the SPI of C8051F320 carried out measure command and measure data transfer to ADS7846.By taking the application of the interface circuit in touch screen an example,analyze the problems of interface circuit then find a solution to those.The actual application shows that the design is reasonable.
出处
《兵工自动化》
2010年第8期43-45,共3页
Ordnance Industry Automation
