Patent ID: 9030214
Filing Date: 2015-05-12
Classification: G06F

Abstract:
1. A sensor for sensing proximity or touch of an object, the sensor comprising: a sensing region; an oscillating signal generator for generating an oscillating signal having an oscillation period; a gating signal generator for generating a gating signal having a gating duration; a controller for controlling the oscillation period and/or the gating duration; a processing module for determining a number N of oscillation periods over the gating duration, the number N being indicative of the object's contact with, or proximity to, the sensing region; a sensing capacitor operatively coupled to the sensing region, wherein the controller controls a variable current source or sink for providing a controllable current to charge or discharge the sensing capacitor; and a pre-scalar operatively coupled to the gating signal generator, wherein the pre-scalar is controlled by the controller for increasing the gating duration.