Abstract Along with present information technology swift development and traditional industry transformation gradual realization. Can the independent working temperature examination and the display system applies in many domains. Traditional temperature examination take thermistor as temperature sensitive unit. Thermistor's cost is low, but needs the following signal processing electric circuit, moreover the reliability is relatively bad, the temperature measurement accuracy is low, the examination system also has certain error. Compares with the traditional thermometer, here designs the digital thermometer has the reading to be convenient, the temperature measurement scope is broad, the temperature measurement is precise, the digit demonstrated that applicable scope wide and so on characteristics. Selects at89C51 monolithic integrated circuit to take the master control component, DSl8820 takes the temperature measurement sensor through 4 altogether anode LED nixietube serial port transmission data, realizes the temperature demonstration. Is measured through the DSl8820 direct read the temperature value, carries on the data conversion, this component's physical chemistry stable property, the linearity is good, is smaller than at O℃~100℃ the biggest linear deviation 0.1℃. This component may to the monolithic integrated circuit transmission digital signal, be advantageous for monolithic integrated circuit processing and the control directly. Moreover, this thermometer can also use the temperature measurement component survey temperature directly, thus reduced data transmission and treating processes.
Keywords: Monolithic integrated circuit； Temperature sensor；DS18B20, AT89C51；Display circuit；Digital thermometer
