Research of intelligent temperature controller based on serial interface chip

This paper expounds design method and hardware circuit of intelligent temperature controller based on serial chip. The watchdog circuit of controller is realized by serial chip 25045, LED display is realized by serial chip MC14489. Communication function with the computer is completed by MAX232C. The hardware and software design of A/D conversion is realized by serial chip MAX187. For the D/A output, not only the hardware connection and software program are provided, but also the time schedule of D/A converting circuit is analyzed. Compared with the past design, All of the chips which are used by the intelligent temperature controller are serial chips. The advantage is that it has small volume and saves I/O resource of CPU. The system has high reliability and stable performance and it is used expediently.