Systems and methods for detecting low ground mass conditions in sensor devices

A capacitive sensor device comprising:

• a first set of electrodes;
• a second set of electrodes;
• and
• a processing system communicatively coupled to the first set of electrodes and the second set of electrodes, the processing system configured to:
• acquire a first plurality of measurements of change in capacitive coupling between sensor electrodes of a first set of sensor electrodes and sensor electrodes of a second set of sensor electrodes;
• and
• acquire a second plurality of measurements of change in capacitive coupling between each sensor electrode of the second set of sensor electrodes and an input object;
• determine a first combined measurement based on the first plurality of measurements;
• determine a second combined measurement based on the second plurality of measurements;
• and
• determine positional information for the input object based on a low ground mass parameter, wherein the low ground mass parameter is based on the first combined measurement and the second combined measurement.

A method of capacitive sensing, the method comprising:

• acquiring a first plurality of measurements of change in capacitive coupling between sensor electrodes of a first set of sensor electrodes and sensor electrodes of a second set of sensor electrodes;
• acquiring a second plurality of measurements of change in capacitive coupling between each sensor electrode of the second set of sensor electrodes and an input object;
• determining a first combined measurement based on the first plurality of measurements;
• determining a second combined measurement based on the second plurality of measurements;
• determining positional information for the input object based on a low ground mass parameter, wherein the low ground mass parameter is based on the first combined measurement and the second combined measurement.