Touch sensing circuit and touch sensing method

摘要

The present invention discloses a touch-sensing method, applied to a touch-sensing circuit, wherein the touch-sensing circuit includes a detection circuit and a comparison circuit. The touch-sensing method includes: enabling a receiving node to be coupled to a ground during a first discharge period, wherein the receiving node is coupled between the detection circuit and the comparison circuit; enabling the receiving node to obtain a first reference voltage during a first charge period; enabling the receiving node to be coupled to the ground during a second discharge period; and enabling the receiving node to obtain a second reference voltage and producing a sensing result according to the first reference voltage and the second reference voltage by the comparison circuit during a second charge period, wherein the sensing result represents whether a touch event occurs at a first node of the touch-sensing circuit.

主权项

1. A touch-sensing circuit, comprising:
a detection circuit, comprising:
a first node, arranged to generate a sensing capacitor according to a touch event;a first capacitor, having a first terminal coupled to the first node, and a second terminal coupled to a ground;a second capacitor, having a first terminal coupled to the first node, and a second terminal coupled to a second node;a third capacitor, having a first terminal coupled to the second node, and a second terminal coupled to the ground;a first switch, arranged to be coupled between the first node and the ground;a second switch, arranged to be coupled between the second node and the ground; anda third switch, arranged to couple the first node or the second node to a receiving node; a fourth capacitor, having a first terminal coupled to a voltage source, and a second terminal coupled to the receiving node; and a comparison circuit, arranged to produce a sensing result according to a voltage at the receiving node.