TCS37717FN Datasheet, PDF (18/48 Pages) List of Unclassifed Manufacturers – The benefits and features of the TCS3771 are listed below

Figure 21:
Proximity Detection
TCS3771 − Principles of Operation
Proximity Detection
Proximity sensing uses an external light source (generally an
infrared emitter) to emit light, which is then viewed by the
integrated light detector to measure the amount of reflected
light when an object is in the light path (Figure 21). The amount
of light detected from a reflected surface can then be used to
determine an object’s proximity to the sensor.
Figure 22:
Proximity Detection Operation
The TCS3771 has controls for the number of IR pulses
(PPCOUNT), the integration time (PTIME), the LED drive current
(PDRIVE) and the photodiode configuration (PDIODE). The
photodiode configuration can be set to red diode
(recommended), clear diode, or a combination of both diodes.
At the end of the integration cycle, the results are latched into
the proximity data (PDATA) register.
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ams Datasheet, Confidential
[v1-20] 2014-Aug-06