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    November 28

    IC卡座结构和IC卡座功能

    IC卡座结构和IC卡座功能 IC卡座是连接IC卡与读写器的.其功能包括对IC卡供电,提供读写信号和伟送数据.要求提供方便的插拔方式和可靠的接触,并带有带电插拔,过流保护,插卡检测等能力.IC卡和插座的结构尺寸必须符合国际标准化组织(ISO)7816的标准. 对触点数目,位置,信号名称和功能都有明确规定,以保证兼容性.
    其中:C1(VCC)为电源;C2(RST)复位信号;C3(CLK)时钟脉冲;C4(RFU) 待用; C5(GND)接地端;C6(VPP)编程电压,用于对EPROM编程;C7( I/O) 数据输入输出端; C8(RFU)待用.
    有些系统中IC卡的C4和C8未用,可见卡上仅有六个触点.由于IC卡与我们常见的磁卡,条码卡的动态扫描方式(俗称-刷卡-)不同,是通过IC卡座触点与IC卡上引脚接触,用电信号静态读写的,因此插拔方式应保证插拔迅速,接触可靠,磨损小.目前IC卡插拔一般有下述几种形式.
    (1)推入-拉出机构:卡的插拔均为手动,因此结构简单.
    (2)推入-推入弹出机构:插入为手动,读写后再向内推卡,卡自动弹出.
    (3)推入-弹出机构:手动推入,卡由机构锁定,操作后,系统自动释放,将卡弹出.
    (4)电动式出入卡机构:卡轻轻插入,卡由机构自动引入,读写后自动送出.
    在开发一个IC卡应用系统时,应该根据应用特点来选择IC卡座类型.如公交售票系统中.要求以快速挺拔,而金融卡则更重视可靠性和寿命.

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