1 . a small and cheap 8 - bit microcontroller is used as control core . all components of the sensor , some of which are necessary for the multiple and intelligent functions , are selected ones with low cost and small package . by designing all auxiliary logic circuits in a complex programmable logic device ( cpld ) , and integrating all analog circuits in an application specific ic ( asic ) , the size of pcb board is greatly reduced , which make it possible that the pcb can be installed with the displacement detector together 系統(tǒng)采用小型廉價8位微控制器控制,電路內(nèi)配置了為實現(xiàn)多功能智能化所必需的硬件,并全部采用低價格、小體積器件,還將所有輔助邏輯電路設計在一片復雜可編程邏輯器件cpld內(nèi),所有模擬電路集成于一片專用集成電路asic內(nèi),大大縮小了電路板尺寸,再與傳感元件組裝在一起,從而使整個系統(tǒng)在保證智能化功能的前提下,具有體積小、成本低、一體化和抗干擾能力強的特點。