STEP DETERMINING METHOD OF VARIABLE RESISTANCE SWITCH

摘要

PURPOSE: A method for determining a step of a variable resistor switch is provided to reduce a manufacturing cost by calculating the step of the variable resistor switch. CONSTITUTION: A step mean is calculated(S110). The step mean is obtained by averaging the voltage change difference of each step of the variable resistor which is changed stepwise. A voltage value corresponding to the minimum variable resistor, the voltage value corresponding to the maximum variable resistor, the step mean are stored in the memory(S120). The step change value is calculated using the voltage value change quantity of the variable resistor every sampling time. The accumulated total step change value is calculated(S130). The current voltage value of the variable resistor is read based on the voltage value corresponding to the minimum variable resistor. The quotient and the remainder are calculated by dividing the current voltage value of the variable resistor by the step mean. The quotient is set to the current step value of the variable resistor. The remainder is calculated with the set reference value. The current step value is corrected(S140).