VCNL4000 DEMO KIT Vishay, VCNL4000 DEMO KIT Datasheet - Page 2

• 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.

Application Note
Vishay Semiconductors
KIT COMPONENTS
There are three main components to the kit. The first is the
blue sensor board on which is soldered the VCNL4000, a
decoupling capacitor, and a 2 x 8 pin connector; the USB
connector which supplies “clean” power to the sensor
board; and the development software found on the CD. The
sensor board can be plugged into the USB in the up or down
orientation. An indicator light will be illuminated when the
sensor board is receiving power and connected to the
development software. The CD also contains a Quick Start
menu and a software licensing agreement. Note that the
licensing agreement must be saved in the C-drive before the
software will run.
VCNL4000 Development Software
After installing the software, run the following command:
USB_Sensor_Kit_VCNL4000.exe.
program, the Proximity Function screen is displayed. There
are four tabbed files: Proximity Function, Ambient Light
Function, Register Values and Information VCNL4000.
PROXIMITY FUNCTION
Proximity Mode
Select a single measurement or periodic measurement. The
periodic measurement rates are set in the Measurement
Speed window. The default setting is “single measurement
(on demand)”. Selecting periodic measurement sets the
“prox_od” bit 3 of the command register #0 (80h) to “1”.
Compensation offset and IIR filtering are only available with
periodic measurements. See screen shot 1.
Measurement Parameter
Sets the infrared emitter current. The infrared emitter current
determines the effective range of the sensor; higher current
will translate to a longer sensing range. This feature can also
be used to determine the impact of the cover or window on
the sensing range. To compensate for the infrared light
absorbed by the window, the current can be increased. The
current can be set by either toggling up or down or by left
clicking in the window and a current select bar will pop-up.
The default setting is 100 mA.
Measurement Speed
Sets
measurements when in periodic measurement mode. A
delay time of “100” leads to about 10 measurements/s.
Choosing “1” leads to more than 200 measurements/s
which is fastest for this demo tool.
Clear Display
Clears the upper and lower window graphs and resets the
“Data#” to zero. The Proximity Value field near the bottom
of the screen is not cleared. This field will be updated with
the next measurement.
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THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
the
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For technical questions, contact:
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This document is subject to change without notice.
VCNL4000 Demo Kit
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Proximity Value
Changes the unit of measure for the proximity value. Click on
the small blue letter on its left side. This letter indicates the
selected format: b = binary, d = decimal, x = hexadecimal,
o = octal, and p stands for SI notation
Infinite Impulse Response (IIR) Filter
This low pass filter is activated with the “active” button and
shows an average of the measurement results. The average
value can be changed from 1 to 20 by clicking on the toggle
arrow where 1 corresponds to no averaging and 20 to strong
averaging. When active, the button will be red.
Upper Window
Displays the entire 16-bit measured signal from 0 to 65535
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.
Proximity Measurement
Click on the Measure button to initiate a measurement.
Offset
Without an object in range, the upper window shows an
offset of approximately 3000 counts. The lower window
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 10K to 15K counts. For the kit, the offset value is
calculated by averaging the last 2 seconds of counts. In a
smart phone application, for example, 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 or noise floor. By clicking
the “Compensate Offset” button the software simulates this
subtraction. When this function is active, the button will be
red. With compensation offset active, the digital signal in the
lower frame will display only the counts related to the
reflected signal.
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Document Number: 83395
Revision: 29-Apr-11