Touch Sensor For Mobile Device With Radio
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United States of America Patent
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Issued Date -
Dec 4, 2014
app pub date -
May 30, 2013
filing date -
May 30, 2013
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
An integrated circuit that includes a wireless transceiver and a touchpad detection circuit is disclosed. The integrated circuit includes oscillators in the pad area of the device, thus minimizing silicon area used for this function. The oscillators consist of an inverting input buffer, such as a Schmidt trigger with a resistive feedback path from the output of the input buffer back to its input. The input of the buffer is also in communication with the external connection pad within the pad area. This allows an external component, such as a capacitor or touch sensor to be coupled to the oscillator. The method of operating a touchpad is also disclosed, where the oscillators may be selectively enabled.
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