ROHM Semiconductor has unveiled its new
monolithic optical proximity and digital ambient light sensor IC family,
which has been developed to meet the needs for greener, more
user-friendly sensing and providing greater interactivity with lower
power consumption. The BH1771GLC series is well-suited for all applications
requiring touchless motion sensing.
The sensor ICs are able to drive three peripheral infrared
LEDs through an integrated LED driver in the proximity sensor block. A
receiver block in the sensor IC detects the light reflected from people
or objects and analyzes the phase difference. Designers just have to
connect the IC to the host system to screen movement a couple of cm
above the sensor IC.
The BH1771GLC's built-in ambient light sensor reduces power consumption
in devices equipped with an LCD in a variety of environments by
controlling the backlight brightness based on ambient conditions. In
addition, in order to prevent malfunctions during conversation or key
operation (i.e. when the user's face/a finger is nearby) a proximity
sensor is integrated that detects objects and prevents corresponding
operations. Also, the backlights are turned off during this time in
order to reduce power consumption. ROHM provides both dimming and
malfunction prevention capability on a single chip.
The ambient light sensor features spectral sensitivity characteristics
close to the human eye, resulting in stable high sensitivity, regardless
of light source (i.e. incandescent, fluorescent, sunlight). The result
is optimum performance and visibility in a variety of environments.
In order to increase operation time especially of battery-driven
portable devices, the internal components must deliver added
functionality. Meeting this requirement, the ambient light sensor and
proximity sensor blocks of the BH1771GLC family feature intermittent
operation that further reduces power consumption.
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This article originally appeared on EE Times Europe.