Sensor controller, electronic device, and position detection method

An electronic device comprising:

• a capacitive touch sensor;
• and
• a sensor controller connected to the capacitive touch sensor,
• wherein the sensor controller includes:
• a scan execution circuit which, in operation, repeatedly performs a first scan and a second scan on the capacitive touch sensor in a time-division manner, the first scan detecting an active pen that transmits a signal, the second scan detecting a passive pointer that does not transmit the signal,
• a first calculation circuit which, in operation, calculates a first pen position from a first detection signal acquired through the first scan performed by the scan execution circuit, the first pen position being a position indicated by the active pen,
• a second calculation circuit which, in operation, calculates a touch position and a second pen position from a second detection signal acquired through the second scan performed by the scan execution circuit, the touch position being a position indicated by the passive pointer, the second pen position being a position indicated by the active pen, and
• an output processing circuit which, in operation, outputs a pen position that differs depending on a result of a comparison process in which the first pen position calculated by the first calculation circuit is compared with the second pen position calculated by the second calculation circuit.

A position detection method performed by a sensor controller that is coupled to a capacitive touch sensor, the position detection method comprising:

• repeatedly performing a first scan and a second scan on the capacitive touch sensor in a time-division manner, the first scan detecting an active pen that transmits a signal, the second scan detecting a passive pointer that does not transmit the signal;
• calculating a first pen position from a first detection signal acquired through the first scan, the first pen position being a position indicated by the active pen;
• calculating a touch position and a second pen position from a second detection signal acquired through the second scan, the touch position being a position indicated by the passive pointer, the second pen position being a position indicated by the active pen;
• and
• outputting a pen position that differs depending on a result of a comparison process in which the first pen position is compared with the second pen position.