Proximity sensors and methods for sensing proximity
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United States of America Patent
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-
Mar 15, 2011
Grant Date -
May 14, 2009
app pub date -
Apr 10, 2008
filing date -
Nov 14, 2007
priority date (Note) -
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status (Latency Note)
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Abstract
In an embodiment, a proximity sensor includes a driver, a photo-diode (PD) and an analog-to-digital converter (ADC). The proximity sensor can also include a controller to control the driver. The driver selectively drives a light source, e.g., an infrared (IR) light emitting diode (LED). The PD, which produces a current signal indicative of the intensity of light detected by the PD, is capable of detecting both ambient light and light produced by the light source that is reflected off an object. The ADC receives one or more portion of the current signal produced by the PD. The ADC produces one or more digital output that can be used to estimate the proximity of an object to the PD in a manner that compensates for ambient light detected by the PD and transient changes to the detected ambient light.
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