Position detection circuit, position detection method, and position detection system

A position detection system, comprising:

• a stylus that communicates with a sensor;
• and
• an integrated circuit that is connected to the sensor to detect a position of the stylus and a position of a touch, wherein the integrated circuit includes:
• at least one processor;
• and
• at least one memory storing firmware that, when executed by the at least one processor, causes the integrated circuit to:
• detect a touch to an input surface arranged on a sensor;
• detect the stylus based on proximity information that indicates proximity of the stylus to the sensor,
• wherein the integrated circuit, in operation, detects the stylus if the proximity information is greater than or equal to a threshold;
• and
• wherein the integrated circuit, in operation, changes the threshold based on a detection result of the integrated circuit.

A method comprising:

• detecting a touch to an input surface arranged on a sensor;
• detecting a stylus based on proximity information that indicates proximity of the stylus to the sensor, wherein the stylus is detected if the proximity information is greater than or equal to a threshold;
• and
• changing the threshold based on a result of detecting the touch.