本文用晶体管PN结作温度传感器，用集成电路ICL7135等作A／D转换器，以AT89C51为控制器，制作了测量精度可达0.01℃的数字温度计。主要介绍了本数显温度计的硬件结构和软件编程实现的方法，通过实验测试说明，所设计的温度计能达到要求。关键词：单片机AT89C51 数显温度计 温度传感器 A／D转换器Abstract: This paper introduces a digital thermometer with 0.01℃ precision, whosecontroller is the computer AT89C51 ,whose A/D converter is made of the integratedcircuit ICL7135 and whose temperature sensor is made of a transistor tube. Thispaper demonstrates the procedures of the hardware structuring and the softwareprogramming of this kind of digital thermometers. Experiments and tests prove thatthe design of this kind of digital thermometers has come up to the requiredstandards.Key words: single-chip AT89C51, digital thermometer, temperature sensor, A/Dconverter