Application Note
www.vishay.com
Vishay Semiconductors
VCNL4000, VCNL4010, and VCNL4020 Demo Kit
AMBIENT LIGHT FUNCTION
Ambient Mode
Select a single measurement or periodic measurement. The
default setting is “single measurement (on demand)”. Click
‘Measure’ to execute the measure function.
See screen shot 3.
Upper Window
The upper window displays the entire 16-bit measured
signal from 0 to 65 535 counts.
Lower Window
The lower window displays only the active or dynamic
range. The y-axis represents the number of counts and will
change depending on the sensor reading.
Measurement Parameter
Defines the number of measurements used in the
averaging function. Use the toggle button located under
the “Sampled Values in 100 ms” title to scroll through
available settings or click within the white value box
and a pull down menu opens displaying all available values.
The advantage of this function is that disturbance from
50 Hz/60 Hz sources (100 Hz/120 Hz) is significantly
reduced by averaging. The default setting is 128 which
sets bit 0, bit 1 and bit 2 of register #4 to 7(dec) (111);
translated, 2 7 or 128 measurements within 100 ms. These
128 measurements are averaged and the result is then
available within Ambient Light Result register #5 and #6.
Auto Offset
Compensates for temperature related drift of the ambient
light measurements. With auto offset active, the offset value
is measured before each ambient light measurement and
subtracted automatically from the actual reading. The
default setting is “Auto Offset” active. “Auto Offset” is bit 3
of Ambient Light Parameter Register #4 (84h).
Continuous Conversion
Allows for faster measurements. With this selected, single
conversions are made in a much shorter time.
Screen Shot 3
Revision: 12-Mar-12
5
Document Number: 83395
For technical questions, contact: sensorstechsupport@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc?91000
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