Increasing resolution of resistance measurements

A method of increasing resolution of resistance sensing, includes the steps of:

• determining a maximum resistance position of a resistive device;
• sensing a voltage that is generated by passing a current through the resistive device when the resistive device is at the maximum resistance position;
• increasing the current generated by a variable current source by increasing the current value, until the voltage that is sensed is near a maximum voltage;
• storing the current value used by the variable current source associated with the maximum voltage as a first current value;
• determining a minimum resistance position of the resistive device;
• sensing the voltage that is generated by passing the current through the resistive device when the resistive device is at the minimum resistance position;
• decreasing the current generated by the variable current source by decreasing the current value, until the voltage that is sensed is near a minimum voltage when the device the resistance position;
• storing the current value used by the variable current source associated with minimum voltage as a second current value;
• determining a maximum resolution step value derived from the minimum resistance position and maximum resistance position;
• and
• changing the current value used by the variable current as the resistance value changes by the maximum resolution step value.