Design of the Digital temperature and humidity's measurement and control circuit
and realize it into ASIC
Abstract: In many occasions, it is very important to get the value of temperature and humidity correctly and rapidly. In recetrt years, the field of temperature and humidity's measurement and control (T&H's M&C) is developed quickly arid the chips of T&H's M&C gradually enter the life of people and will be widely used in industry and agriculture.
In allusion to the direction of this field, we develop a mixed signal, chip,which has abilities to measure and control both temperature and humidity. A modified schmitt trigger based relaxation oscillator is used to convert thermistor and hygrometer resistances into a frequency signal .By the way of the save time sampling, the schmitt trigger frequency can be mapped onto temperature and humidity. And then a general control module accomplish the control performance.
Keywords: Temperature and humidity's measurement and control (T&H'M&C), Sensor, CPLD, ASIC Realization, Intellectualized Control