Study of high performance general-purpose temperature acquisition instrument

Temperature acquisition is one of the key sectors in modern measurement and control system.Aiming at the desire of industrial environment,high performance and general-purpose temperature acquisition instruments with multi-channels based on STM32 were fabricated.The system was developed based on ARM Cortex series MCU and 24-bit A/D device-AD7793,and its parts were designed,which included temperature acquisition circuit,digital input/output circuit,LCD circuit,storage circuit,communication interface circuit.Through every analog input channel,the temperature collection of thermistor,3-Wire/4-Wire RTD and thermocouple signal collection was achieved,and communication with PC,data acquisition network or display on PC with multiple communication interfaces were realized,including RS232/485、USB、CAN bus interface for different environment.The experiment results demonstrate that the system has reasonable structure and high precision and satisfactory results.