Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 1 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Features:
• High-resolution conversion of light intensity to frequency
• Selectable color output frequency
• Communicates directly with a microcontroller
• Sensor power supply operation (2.7 V to 5.5 V)
• LED power separate input
• Includes LED, Sensor and interface cable
Ordering Information
OPB780Z OPB780 with 10” Long Flat Flex Cable
KA3128 10” Long Flat Flex Cable
RoHS
Description:
The OPB780Z color sensor uses a light-to-frequency converter that combines 64 configurable silicon photodiodes
(on a 144 um center and measuring 120 um x 120 um each), with a white LED in a small, lightweight package that
makes it ideal for using in miniature applications.
The output is a square wave (50% duty cycle) with a frequency directly proportional to reflected light intensity
(irradiance).
The light-to-frequency converter reads an 8 x 8 array of photodiodes that consists of four groups of 16 photodiodes
each, segregated by color: 16 photodiodes with red filters, 16 photodiodes with green filters, 16 photodiodes with
blue filters and 16 clear photodiodes with no filters. Each color’s group of 16 photodiodes is interdigitated to
minimize the effect of non-uniformity of the incident irradiance. Each color’s group is also connected in parallel.
The type of photodiode used during operation is pin-selectable.
The output of the device is designed to drive a standard TTL or CMOS logic input over short distances.
The internal photodiode used by the device is controlled by two logic inputs, S2 and S3. See page 4 for more
information.
A 10 “ [25.4 cm] Flat Flexible Cable (FFC) is included for easy hook-up.
The FFC is designed to interface with an AVX (ELCO) part number 04 6249 0080 00 800 connector.
For more information, contact your local representative or OPTEK.
Applications:
• Photographic equipment
• Colormetry
• Chemical analyzers
• Display contrast controls
• High resolution digital measurement of light
intensity
Photodiode Array Current-to-Frequency
Converter
S3S2
Out
Light
64
3
Block Diagram
Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 2 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Absolute Maximum Ratings1, 2 (TA = 25° C unless otherwise noted)
Operating Temperature TOPR = -30° C to +85° C
Storage Temperature TSTG = -30° C to +85° C
LED—Absolute Maximum Ratings1, 2 (TA = 25° C unless otherwise noted)
Reverse Voltage VR = 5 V
Forward Current IF = 30 mA
Power Dissipation PD = 120 mW
Peak Forward Current IFP = 100 mA
Sensor—Absolute Maximum Ratings1, 2 (over operating free-air temperature range unless otherwise noted)
Supply Voltage(VDD) 6 V
Input Voltage (all inputs, VI) -0.3 V to VDD + 0.3 V
Pin Name Pin # Description
VDD 1, 2 Supply voltage
OUT 3 Output Frequency (FO)
S2 4 Photodiode type selection input
LED Anode 5 LED input
S3 6 Photodiode type selection input
GND 7, 8 Power supply ground
SO
S1
OE
Gnd V
Out
S2
S3
DD
7,8
6
4
3
1,2
5
Cap (0.1µf)
LED
DO NOT LOOK DIRECTLY AT LED
WITH UNSHIELDED EYES OR
DAMAGE TO RETINA MAY OCCUR.
Notes:
(1) Stresses beyond those linked under “absolute maximum rating” may cause permanent damage to device. These are only stress
ratings, and functional operating of the device at these (or any other) conditions beyond those indicated in the Recommended Operating
Conditions table shown above may affect the device’s reliability.
(2) All voltage values are with respect to GND.
Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 3 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Sensor
Electrical Characteristics1 (TA = 25° C, VDD = 5 V unless otherwise noted)
SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS
VOH High-Level Output Voltage 3 - 4.5 - V IOH = -4 mA
VOL Low-Level Output Voltage 3 - 0.25 - V IOL = 4 mA
IIH High-Level Input Current - - 5 µA -
IIL Low-Level Input Current - - 5 µA -
IDD - 2 3 mA Power on
- Full-Scale Frequency 2 - 600 - kHz -
- Temperature Coefficient of
Output Frequency - ±200 - ppm/°C
λ ≤ 700 nm, -25° C ≤ TA ≤ 70° C / ± 200
ppm/° C
tr, tf Typical Temperature Rise Time
Typical Temperature Fall Time - 100 - µ sec. -
Supply Current
Notes:
(1) All voltage values are with respect to GND.
(2) Full-scale frequency is the maximum operating frequency of the device without saturation.
(3) Output interface of device is designed to drive a standard TTL or CMOS logic input over short distances. If lines greater than 12 inches are
used on output, a buffer or line driver is recommended.
Sensor
Recommended Operating Conditions1
SYMBOL PARAMETER MIN TYP MAX UNITS RECOMMENDED CONDITIONS
VDD Supply Voltage 2.7 5 5.5 V -
VIH High-Level Input Voltage 2.0 - VDD V VDD = 2.7 V to 5.5 V
VIL Low-Level Input Voltage 0.0 - 0.8 V VDD = 2.7 V to 5.5 V
TA Operating Free-Air Temperature
Range -40 - +70 °C -
LED
Electro-Optical Characteristics of LED1 (TA = 25°C unless otherwise noted) (See OVLAW4CB7 for more info.)
SYMBOL MIN TYP MAX UNITS TEST CONDITIONS
IV
(1) Luminous Intensity - 1.0 - cd IF = 20 mA
VF Forward Voltage 2.8 3.4 3.9 V IF = 5 mA
IR Reverse Current - - 10 µA VR = 5 V
PARAMETER
Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 4 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
OPB780Z Sensor -
Typical Electro-Optical Characteristics
Curves
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
300 500 700 900 1100
λp Wavelength (nm)
No rmalized to
Clear @ 530 nm
TA = 25° C
Relative Responsivity
Spectral Response
with >700nm Cut-Off Filter (not included)
Photodiode Spectral Responsivity
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
300 500 700 900 1100
λp Wavelength (nm)
No rmalized to
Clear @ 680 nm
TA = 25° C
Relative Responsivity
Spectral Response
Notes:
(1) IF = 5 mA, D = 0.225 inch,
(2) All voltage values are with respect to GND.
Output Frequency Characteristics1
(VDD = 5 V, TA = 25 °C, IF = 5mA)
Target / Surface Minimum Maximum Units
Red Filter Selected (S2=L/S3=L)
Red 23 41
kHz
Green 7 15
Blue 3 7
White - 1.5
Green Filter Selected (S2=H/S3=H)
Red 6 15 kHz
Green 6 37
Blue 5 13
White - 1.5
Blue Filter Selected (S2=L/S3=H)
Red 4 23 kHz
Green 13 21
Blue 21 36
White - 1.5
Red 38 71 kHz
Green 46 85
Blue 31 60
White - 5
Clear Filter Selected (S2=H/S3=L)
Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 5 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
TA = 25°
0° 10° 20°
1.0
0.9
0.8
0.7
0.5 0.3 0.1 0.2 0.4 0.6
30°
40°
50°
60°
70°
80°
90°
Sensor Radiation Diagram
OPB780Z Sensor & LED - Typical Electro-Optical Characteristics Curves
Spectrum
0.0
0.2
0.4
0.6
0.8
1.0
1.2
350 450 550 650 750
Wavelength λp (nm)
Relative Emission Intensity
(a.u.)
TA = 25° C
IF = 20 mA
Ambient Temperature vs Chromaticity
Coordinate
0.30
0.31
0.32
0.33
0.34
0.35
0.29 0.30 0.31 0.32 0.33 0.34
X
Y
-30° C
0°
C
25° C
50° C
85° C
I
FP
= 20 mA
TA = 25° C
IF = 20 mA
Relative Luminosity (a.u.)
Radiation Angle
LED Directivity
Forward Current vs Chromaticity
Coordinate
0.30
0.31
0.32
0.33
0.34
0.35
0.29 0.30 0.31 0.32 0.33 0.34
X
Y
1 mA
50 mA
5 mA
20 mA
100 mA
TA = 25° C
LED Spectrum
Reflective Color Sensor Assembly
OPB780Z
OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747 FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
Issue A.5 6/09
Page 6 of 6
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Duty Ratio vs Allowable
Forward Current
10
100
1000
1 10 100
Duty Ratio (%)
Allowable Forward Current
I
FP
(mA)
T
A
= 25
o
C
Forward Voltage vs Forward
Curre nt
1
10
100
1000
2.5 3.0 3.5 4.0 4.5 5.0
Forward Voltage V
F
(V)
Forward Current I
FP
(mA)
TA = 25o C
A
mbient Temperature vs Forward
Voltage
2.6
3.0
3.4
3.8
4.2
4.6
5.0
5.4
-40 -20 0 20 40 60 80 100
Ambient Temperature T
A
(
o
C)
Forward Voltage V
F
(V)
I
FP
= 60 mA
I
FP
= 20 mA
I
FP
= 5 mA
Ambient Temperature vs Relative
Luminosity
0.1
1.0
10.0
-40 -20 0 20 40 60 80 100
Ambient Tem
p
erature T
A
(
°C
)
Relative Luminosity (a.u.
)
I
FP
= 20 mA
Forward Current vs Relative
Luminousity
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0 20 40 60 80 100 120
Forward Current I
FP
(mA)
Relative Lum inousity (a.u.
)
T
A
= 25
o
C
A
mbient Temperature vs Allowable
For w a r d Cur r e nt
0
10
20
30
40
0 20406080100
Ambient Temperature T
A
(
o
C)
Allowable Forward Current
I
F
(mA)
OPB780Z LED - Typical Electro-Optical Characteristics Curves
