数字温度计利用AD590集成温度传感器及其接口电路完成温度的测量并转换成模拟电压信号，经由模数转换器ADC0804转换成单片机能够处理的数字信号，然后送到单片机AT89S52中进行处理变换，最后将温度值显示在D4、D3、D2、D1共4位七段码LED显示器上。系统以AT89S52单片机为控制核心，加上AD590测温电路、ADC模数转换电路、4位温度数据显示电路以及外围电源、时钟电路等组成。-Digital thermometer and the temperature sensor using the AD590 integrated circuit performs the interface temperature is measured and converted into an analog voltage signal into a digital signal that can be processed by the microcontroller analog to digital converter ADC0804, and then sent to the microcontroller for processing AT89S52 transformation temperature finally value displayed on the D4, D3, D2, D1 of four seven-segment LED display. System AT89S52 microcontroller core, plus AD590 temperature measurement circuit, ADC analog-digital conversion circuits, four temperature data show circuit and the external power supply, the clock circuit.