说明：  简单介绍了ADS7843的功能特点和工作原理，探讨了触摸屏接口芯片的模式选择和应用技巧，最后给出了基于该系统的一个实际使用方案。
(ADS7843 features a brief introduction of the characteristics and working principle of the touch screen interface chip mode selection and application of skills, given a system based on the actual use of the program.)