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Electronic access control device

DC
  • US 7,295,100 B2
  • Filed: 10/20/2005
  • Issued: 11/13/2007
  • Est. Priority Date: 11/15/1994
  • Status: Expired due to Fees
First Claim
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1. An apparatus comprising:

  • a non-volatile memory containing a stored access code;

    a circuit comprising two processors wherein at least one of the processors is shielded from external access;

    a portion of the circuitry generating a wake-up signal in response to pressing a key on a keypad;

    at least one of the processors being woke-up in response to the wake-up signal and receiving an input code;

    at least one of the processors being woke-up and comparing the input code with the stored access code;

    at least one of the processor generating a signal to activate a lock actuator if the input code matches the stored access code;

    at least a portion of the circuitry comprising a low battery detection circuit that is enabled by one of the processors in an operation mode and disabled in a sleep mode, the low battery detection circuit measuring a voltage of a battery in the operation mode; and

    ,wherein at least one of the processors enters a sleep mode wherein the processor operates at a lower power consumption rate than when the processor is awake.

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