Semiconductor device and method of forming same for acoustic sensing of close proximity objects
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United States of America Patent
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Oct 6, 2015
Grant Date -
Sep 12, 2013
app pub date -
Mar 8, 2013
filing date -
Mar 9, 2012
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Abstract
In embodiments a circuit provides a circuit for use in detecting close proximity objects in an acoustic distance sensing system. The circuit produces a close proximity zone flag when the time after transmitting an acoustic distance sensing pulse corresponds to the defined close proximity range. The circuit can also include a time of flight counter for determining the time of flight of a received echo. The circuit can further produce a close proximity time if flight valid flag indicating that echoes are being received in close proximity time frame.
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