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SYSTEM AND METHOD FOR DETERMINING VOLTAGE LEVELS

  • US 20050107966A1
  • Filed: 04/09/2003
  • Published: 05/19/2005
  • Est. Priority Date: 04/09/2003
  • Status: Active Grant
First Claim
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1. A method for determining a power source voltage level of a power source in a system in which the power source is connected to a microcontroller, comprising:

  • charging a charging circuit in direct communication with a pin of the microcontroller using a constant voltage level;

    determining a time when the charging circuit attains a voltage level sufficient to transition the pin of the microcontroller from a state corresponding to a logic “

    0”

    to a state corresponding to a logic “

    1;

    ” and

    using the determined time and a predetermined relationship between the power source voltage level and an input port transition voltage value of the microcontroller to determine the power source voltage level of the power source.

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