Method and device for improved accuracy of proximity and touch detection in mobile devices

A method of making a semiconductor device, comprising:

• providing a sensor controller including a capacitive sensor input and a reference sensor input;
• determining a parameter setting for the semiconductor device from observed readings of the reference sensor input at a plurality of environmental temperatures based on a relationship between the reference sensor input and the capacitive sensor input;
• using the parameter setting and a reading of the reference sensor input to produce an adjusted reference sensor reading;
• and
• adjusting a reading of the capacitive sensor input using the adjusted reference sensor reading.

A method of making a semiconductor device, comprising:

• providing a main sensor input;
• providing a reference sensor input;
• determining a parameter setting for the semiconductor device from observed readings of the reference sensor input at a plurality of environmental temperatures based on a relationship between the reference sensor input and the main sensor input;
• using the parameter setting to produce an adjusted reference sensor reading;
• and
• adjusting a reading of the main sensor input using the adjusted reference sensor reading.

A semiconductor device, comprising:

• a main sensor input;
• a reference sensor input;
• and
• a parameter setting from observed readings of the reference sensor input at a plurality of environmental temperatures defining a relationship between the reference sensor input and the main sensor input;
• and
• a sensor controller programmed to produce an adjusted reference sensor reading using the parameter setting and further to adjust a reading of the main sensor input using the adjusted reference sensor reading.