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VEML6031X00 Ambient
Light Sensors
Figure 5: Ambient light sensors can be implemented for display dimming at night.
(Source: Vishay)
Display Dimming
While the proximity sensors gather information about what is
happening in front of the display, Vishay's AEC-Q101-qualified
VEML6031X0 ambient light sensor (ALS) can be implemented for
display dimming (Figure 5).
The main challenge faced in these applications is the
increasingly dark cover materials used in automotive interiors,
at times allowing less than 1 percent of visible light to pass
through. This requires a sensor with very high sensitivity (down
to 0.0023lx/count) so that even very low light conditions can be
sensed and reacted to accordingly.
To account for the increase of dark current with regard to
temperature fluctuations, the part features active temperature
compensation to make sure that the read lux value always stays
within range.
The robust 6-pin automotive package allows for stability across
a high-temperature range and features opaque side walls so
that stray light does not affect the results. Because the
sensitivity is trimmed within the package, it results in a low part-
to-part tolerance, reducing the complexity of calibration in the
end design.
To test all of these features, Vishay offers a complete support
package with every sensor, including a dedicated application
note and demo board, and demonstration software to get up
and running quickly. Ray simulation files and C/C++ libraries are
also offered so that application-based optical and mechanical
implementations can be simulated and prototypes can be set up
easily. ▼
