METHOD AND SYSTEM FOR DETERMINING AN ACTUAL MINIMUM OPERATING VOLTAGE FOR A MICROPROCESSOR CONTROL UNIT

摘要

An electronic device (102) having a microprocessor control unit (110) is powered by a battery (104). The operating voltage provided to the microprocessor control unit (110) by a supplemental power reservoir (106) after removal of the battery is detected. Information corresponding to the value of the operating voltage is stored in nonvolatile memory (106). The detecting and the saving information steps are repeated as the operating voltage decays in response to the discharge of the supplemental power reservoir (106). The actual minimum operating voltage for the microprocessor control unit (110) is determined based upon a last one of the stored information corresponding to the value of the operating voltage. A learned critical voltage value is based upon the defined actual minimum operating voltage.