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The device features advanced Gesture detection, Proximity
detection, Digital Ambient Light Sense (ALS), Color Sense
(RGBC), and optical pattern generation/transmission for
broadt. The modular 2.36mm x 3.95mm x 1.36mm package
is drop-in compatible with existing footprints and incorporates
an IR LED and factory calibrated LED driver.
Gesture detection utilizes four directional photodiodes to
sense reflected IR energy (sourced by the integrated LED) to
convert physical motion information (i.e. velocity, direction and
distance) to a digital information. The architecture of the
gesture engine features automatic activation (based on
Proximity engine results), ambient light subtraction, cross-talk
cancelation, dual 8-bit data converters, power sing
inter-conversion delay, 32-dataset FIFO, and interrupt driven
I 2 C communication.
The gesture engine accommodates a wide range of mobile
device gesturing requirements: simple North-South-East-West
gestures or more complex gestures can be accurately sensed.
Power consumption and noise are minimized with adjustable
IR LED timing.
The Proximity detection feature provides object detection (E.g.
mobile device screen to user’s ear) by photodiode detection of
reflected IR energy (sourced by the integrated LED).
Detect/release events are interrupt driven, and occur whenever
proximity result crosses upper and/or lower threshold settings.
The proximity engine features offset adjustment registers to
compensate for system offset caused by unwanted IR energy
reflections appearing at the sensor. The IR LED intensity is
factory trimmed to eliminate the need for end-equipment
calibration due to component variations. Proximity results are
further improved by automatic ambient light subtraction.
The Color and ALS detection feature provides red, green, blue
and clear light intensity data. Each of the R, G, B, C channels
have a UV and IR blocking filter and a dedicated data converter
producing16-bit data simultaneously. This architecture allows
applications to accurately measure ambient light and sense
color which enables devices to calculate illuminance and color
temperature, cool display backlight, and chromaticity.
The optical pattern generation/transmission feature is
primarily intended for 1-D barcode transmission over IR to
point-of-sale () terminals. The IRBeam engine features a
1024-bit RAM for pattern storage and specialized cool logic
that is tailored to repetitively broadt a barcode pattern using
the integrated LED. The IRBeam engine features adjustable