VCNL4000 DEMO KIT Vishay, VCNL4000 DEMO KIT Datasheet - Page 3

• Manufacturer Part Number: VCNL4000 DEMO KIT
• Description: Kit Components: Blue Sensor Board Containing A VCNL4000, A Decoupling Capacitor, And A 2 X 8 Pin Connector
• Manufacturer: Vishay

Specifications of VCNL4000 DEMO KIT

• A Usb Connector Which Supplies Clean Power To The Sensor Board: And The Development Software Found On The CD.

Object with Range of 10 mm and 5 mm
With compensation offset active, at a range of 10 mm, the
reflection of the object results in an output count of
approximately 1000 counts. At a range of
reflection of the object results in an output count of
approximately 3000 counts. Again, with compensation
offset active, the digital signal in the lower frame shows only
the counts related to the reflected signal.
Display Range
Display a specific range of readings by entering a minimum
reading number on the right side of the x-axis and the
maximum reading number on the left side of the x-axis.
Type over the existing displayed value. This feature is only
available when measurements have stopped.
Register Values
The actual proximity value is available by selecting the
Register Value tab. The high 16-bit value is stored in register
#7 and the low value is stored in register #8. Register #7
equals 36° [00100100] and register #8 equals 33°
[00100001]. See screen shot 2.
FORMAT FEATURES - PROXIMITY
Copy Graph
Right click within the upper or lower window and select
“Copy Data”.
Change Line Color
Click inside the small white rectangle located between the
upper and lower signal window to change line colors,
patterns and other features.
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
Displays the entire 16 bit measured signal from 0 to 65 535
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.
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
Document Number: 83395
Revision: 29-Apr-11
THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
For technical questions, contact:
This document is subject to change without notice.
VCNL4000 Demo Kit
5 mm, the
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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. The default setting
is 128 which sets bit 0 to 2 of register #4 to 7° (111);
translated, 2
averaged result is then available within Ambient Light Result
register #5
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.
Clear Display
Clears the upper and lower window graphs and resets the
“Data#” to zero. The Ambient Light Value field near the
bottom of the screen is not cleared. This field will be
updated with the next measurement.
Ambient Light Value
Displays the ambient light value in binary form only.
Illuminance
Displays the ambient light level in lux. It is calculated by
dividing the number of counts by four. For example, there
are 615 counts which, when divided by four, results in
153.75.
Figure of Merit
The ideal ambient light sensor will produce exactly the same
output (counts) for the same brightness regardless of the
source of light. In reality, silicon-based ambient light sensors
will produce slightly different readings for halogen (2856K
CIE illuminant A), incandescent, fluorescent and white LED
sources. Figure 2 shows the average response for the
VCNL4000 ambient light sensor for all the above light
sources and graphs the number of counts versus lux value
for each light source. The halogen lamp shows a factor of
5.1 for digital counts versus lux, the fluorescent lamp shows
a factor of 3.2 and white LEDs shows a factor of 4.1. The
average response is a factor of 4 counts per lux. As shown
in fig. 1, a count of 1000 corresponds to 250 lx. This same
count could be 200 lx for the halogen lamp or 310 lx for the
fluorescent lamp. The overall tolerance for the VCNL4000
ambient light sensor for different light sources is - 22 % to
+ 24 %.
7
or 128 measurements within 100 ms. This
and #6.
Vishay Semiconductors
Application Note
www.vishay.com/doc?91000
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