OPB780KIT Optek, OPB780KIT Datasheet - Page 4

• Manufacturer Part Number: OPB780KIT
• Description: Optical Sensor Development Tools Color Sensing Kit
• Manufacturer: Optek

Specifications of OPB780KIT

• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Description/function: Color sensor light to frequency kit
• For Use With/related Products: OPB780
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

OPB780-Kit
Color Sensor Evaluation Kit
is very important to understand its characteristics
relative to forward current and temperature.
below chart shows how the forward current of the LED
changes the Chromatic coordinates.
LED lowers the “Y” value while minimally changing the
“X” value.
(equivalent to sun light at 12 noon with no
contaminates in the air) has both “X” and “Y” chromatic
values of 1/3. Chromatic numbers below 1/3 consist of
more Blue or Green wavelengths and numbers above
1/3 consist of more Red or Yellow wavelengths. As
can be seen a forward current of approximately 4 mA
would provide the most optimum “Y” value.
One of the critical parts of the OPB780Z is the LED. It
As can be seen, increasing the forward current of the
Issue A.2
Page 4 of 9
0.35
0.34
0.33
0.32
0.31
0.30
0.29
11/09
Forward Current vs Chromaticity
T
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
A
The projected most optimum light
= 25° C
0.30
Coordinate
0.31
100 mA
50 mA
20 mA
X
1 mA
5 mA
0.32
Phone: [phone] or [phone]
0.33
0.34
The
temperature.
value moves closer toward the optimum (1/3) value.
cooler the temperature, the closer the LED transmits to
the optimum chromatic values of “X”=1/3 and “Y”=1/3.
color resolution, the white LED should be driven with
at least 20 mA of forward current and operated at
room temperatures (approx. 25°C). These conditions
result in chromatic ranges of about “X”=0.31 and
“Y”=0.32.
on the angular position of the device to the object.
The graphs showing the typical variance of the Output
frequency of the device vs both Azmuth (twist) and
Zenith (bend) are shown in the two graphs.
The graphs show the change in chromaticity vs
In conclusion, the lower the forward current and the
In order to provide sufficient light levels and the best
The responsivity of the each diode group is dependent
0.35
0.34
0.33
0.32
0.31
0.30
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Ambient Temperature vs Chromaticity
0.29
FAX: [phone] [e-mail] www.optekinc.com
I
FP
= 20 mA
85° C
0.30
As the temperature reduces the “X”
50° C
Coordinate
0.31
25° C
X
0.32
0° C
-30° C
0.33
0.34