Sensing method and circuit for use with capacitive sensing devices

摘要

A sensing method is used for a capacitive sensing device, wherein the capacitive sensing device has a plurality of capacitive sensing components, each of which is charged or discharged by a charging component respectively. The sensing method comprises the steps of: a first sampling step of sampling at least one of charging or discharging time of a capacitive sensing component of the plurality of capacitive sensing components to determine a first sample time for the component sampled, wherein the component sampled and at least one another component of the plurality of capacitive sensing components are charged or discharged simultaneously during the first sampling step; a first comparing step of comparing the first sample time for the component sampled with a reference time; and an outputting step of outputting a trigger signal in the event that the first sample time exceeds the reference time.

主权项

1. A sensing method of a capacitive sensing device, wherein the capacitive sensing device has a plurality of capacitive sensing components, each of which is charged or discharged by a charging component respectively, the sensing method comprising the steps of:
a first sampling step of sampling at least one of charging or discharging time of a first capacitive sensing component of the plurality of capacitive sensing components to determine a first sample time for the first component, wherein
the first component and at least one other component of the plurality of capacitive sensing components are charged or discharged simultaneously by the charging component of the first component and the charging component of the at least one other component, respectively, during the first sampling step, andwhen liquid is present on the capacitive sensing device at the first component and the at least one other component, the first component of the plurality of capacitive sensing components is charged or discharged by both the charging component of the first component and the charging component of the at least one other component during the first sampling step; comparing the first sample time for the first component with a reference time; and outputting a trigger signal in the event that the first sample time exceeds the reference time; wherein the plurality of capacitive sensing components comprises a capacitive sensing pad, a capacitive sensing screen or a plurality of capacitive sensing keys.