Abstract: A a touch sensor including a keyboard having a key defining a touch sensing location, wherein the key is responsive to at least one of capacitive and electro-magnetic interactions with a user during a touch event includes control circuitry associated with the key, wherein the control circuitry outputs a control signal, and wherein an amplitude of the control signal is representative of an amount of interaction between the user and the key during a touch event. A controller is connected to the control circuitry and analyzes a variation in the amplitude of the control signal over a time period to identify the touch event.

Abstract: A touch sensor includes a keyboard having a key defining a touch sensing location, and control circuitry associated with the key. The control circuitry includes a transistor, and the key controls the transistor based on a touch event. A pulse signal generator is connected to the control circuitry and generates pulsed signals for transmission to the control circuitry. The pulsed signals power the transistor, and the transistor outputs a touch signal when a touch event occurs at the associated key and the transistor outputs a non-touch signal when no touch event occurs at the associated key. An analyzer is connected to the control circuitry and receives from the transistor one of the touch signal indicating the touch event and the non-touch signal indicating the no touch event.