This paper introduces the working principle of logic encryption card SLE4442 and its concrete application at spirometer, and also the design of a general IC card interface circuit.
文章介绍了逻辑加密卡sle4442工作原理及其在肺活量计上的具体应用过程，并设计了一种通用的IC卡接口电路。
It consists of light source, imagery system, CCD, logic interface circuit and computer system.
CCD非接触测振系统由照明光源、成像系统、CCD、检测逻辑接口电路及计算机软件构成。
The key points lies in interface resolve method in hybrid voltage-logic design, A/D sampling circuit, SPI communication port and the protect of the main circuit.
然后分别介绍控制电路和主电路设计原理与思路，重点论述了混合电平逻辑设计中的接口解决方案、A/D采样电路、SPI通讯接口电路及主电路的保护等；
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