WAKE-UP CIRCUIT FOR A SECURITY DEVICE
    7.
    发明公开
    WAKE-UP CIRCUIT FOR A SECURITY DEVICE 审中-公开
    唤醒FOR安全设备

    公开(公告)号:EP2649596A1

    公开(公告)日:2013-10-16

    申请号:EP10860473.7

    申请日:2010-12-09

    IPC分类号: G08B13/22

    摘要: An exemplary security device includes a reader configured to read information stored on a credential device. The reader enters a sleep mode when not reading a credential device. A wake-up module includes an inductively coupled resonant circuit. The wake-up module is configured to detect a credential device near the reader if the credential device has a resonant frequency corresponding to a frequency of an electromagnetic field of the inductively coupled resonant circuit that is controlled by a stable oscillator. The wake-up module is configured to provide an indication to wake-up the reader from the sleep mode responsive to detecting a change in power of the electromagnetic field caused by the credential device.