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Application Note
www.vishay.com
Vishay Semiconductors
VCNL4000, VCNL4010, and VCNL4020 Demo Kit
Upper Window
Displays the entire 16-bit measured signal from 0 to 65 535
Proximity Measurement
Click on the measure button to initiate a measurement.
counts.
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.
Screen Shot 1
Offset
Without an object in range, the upper window shows an
offset of approximately 3000 counts. The lower windows
shows the exact values. This offset is a result of optical
crosstalk and digital noise. In an application where a window
is placed over the top of the sensor, the offset value can be
as high as 10 000 to 15 000 counts. For the kit, the offset
value is calculated by averaging the last 2 seconds of
counts. In a smart phone application the offset value should
be subtracted from incoming proximity readings and the
resultant used to determine object proximity.
Object with Range of 200 mm and 100 mm
Assuming the offset value is 3070 counts, at a range of
200 mm, the reflection from a hand results in an output
count of 3090 counts. This is 20 counts higher than the
offset or noise floor. At a range of 100 mm, the reflection of
the object results in an output count of 3130 counts. This is
50 counts higher than the offset value. By clicking the
“Compensate Offset” button, the software simulates this
subtraction. When this function is active, the button will be
red as in screen shot 1. With compensation offset active, the
digital signal in the lower frame will display only the counts
related to the reflected signal; effectively zeroing the offset.
This is feature of the kit. In actual applications, the offset
value should be subtracted to obtain actual proximity or
ambient counts.
Revision: 12-Mar-12
3
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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