本实验用DA转换＋比较器的方法对外界模拟信号进行检测，同时这种联合装置加上CPLD可以代替低频AD转换器的功能。-this experiment + DA conversion method of comparison to the outside world analog signal detection, while such joint CPLD devices can be replaced with low-frequency AD converter functions.

7290键盘管理及显示芯片有ds1302，ds18b20温度检测芯片联合翻页显示时间及温度-7290 Keyboard Manager and display chips are ds1302, ds18b20 temperature detection chip joint next page display time and temperature