Automatic voltage detection in multiple voltage applications

  • US 5,818,781 A
  • Filed: 11/13/1996
  • Issued: 10/06/1998
  • Est. Priority Date: 11/13/1995
  • Status: Expired due to Term
First Claim
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1. A removable controller card for use in a computer system having a computer and an interface for connecting the computer to the removable controller card and for communicating digital information including power supply input and data between the computer and the card, the card comprising:

  • non-volatile storage devices including at least one Flash memory device responsive to a memory power supply voltage input for causing the Flash memory device to perform functional data operations; and

    a controller including,a voltage detector responsive to the power supply input having a predetermined voltage level and operative to generate a voltage selection signal, said voltage detector for detecting the voltage level of the power supply input;

    a voltage regulator responsive to said voltage selection signal and said power supply input and operative to divide the voltage level of the power supply input to a step-down voltage level, said voltage regulator further operative to provide said memory power supply voltage input having a voltage level representative of either the voltage level of said power supply input or said step-down voltage level based upon the appropriate voltage level required for use by the Flash memory device to successfully perform functional data operations.

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