Abstract:

In this article,MAX6675 is applied to design a multiplex temperature collection system with type-K thermocouple based on CPLD.The article introduces the instruction of the system hardware circuit and the process of logical circuit designing inside of CPLD according to the working principle of the chip.Finally the article gives the statistic figures of temperature data of the system in two different temperature cases.The statistic figures prove the good performance of the system.

Key words: MAX6675;CPLD;type-K thermocouple;multiplex temperature collection;Matlab