Datasheet OPB780Z Datasheet (OPTEK)

Reflective Color Sensor Assembly

OPB780Z

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

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:

Block Diagram

• Photographic equipment

• Colormetry

• Chemical analyzers

• Display contrast controls

Light

• High resolution digital measurement of light

intensity

RoHS

OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Photodiode Array

S3S2

6

OPB780Z OPB780 with 10” Long Flat Flex Cable

KA3128 10” Long Flat Flex Cable

4

Ordering Information

Current-to-Frequency

Converter

Out

Issue A.3 04/07

3

Page 1 of 6

Reflective Color Sensor Assembly

OPB780Z

Absolute Maximum Ratings

Operating Temperature

Storage Temperature

LED—Absolute Maximum Ratings

Reverse Voltage V

1, 2

(T

= 25° C unless otherwise noted)

A

1, 2

(T

= 25° C unless otherwise noted)

A

T

= -30° C to +85° C

OPR

= -30° C to +85° C

T

STG

= 5 V

R

Forward Current IF = 30 mA

Power Dissipation P

Peak Forward Current I

= 120 mW

D

= 100 mA

FP

Sensor—Absolute Maximum Ratings1, 2 (over operating free-air temperature range unless otherwise noted)

Supply Voltage(V

Input Voltage (all inputs, V

Notes:

Stresses beyond those linked under “absolute maximum rating” may cause permanent damage to device. These are only stress

(1)

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.

) 6 V

DD

) -0.3 V to VDD + 0.3 V

I

7,8

SO

S1

OE

Gnd

Cap (0.1µf)

LED

DO NOT LOOK DIRECTLY AT LED

WITH UNSHIELDED EYES OR

DAMAGE TO RETINA MAY OCCUR.

Out

V

S3

S2

DD

6

4

3

1,2

5

Pin Name Pin # Description

VDD 1, 2 Supply voltage

OUT 3 Output Frequency (F

S2 4 Photodiode type selection input

LED Anode 5 LED input

S3 6 Photodiode type selection input

GND 7, 8 Power supply ground

)

O

Issue A.3 04/07
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.

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006

Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Reflective Color Sensor Assembly

OPB780Z

LED
Electro-Optical Characteristics of LED

SYMBOL MIN TYP MAX UNITS TEST CONDITIONS

(1)

Luminous Intensity - 1.0 - cd IF = 20 mA

I

V

Forward Voltage 2.8 3.4 3.9 V IF = 5 mA

V

F

Reverse Current - - 10 µA VR = 5 V

I

R

PARAMETER

Sensor
Recommended Operating Conditions

1

(T

= 25°C unless otherwise noted) (See OVLAW4CB6 for more info.)

A

1

SYMBOL PARAMETER MIN TYP MAX UNITS RECOMMENDED CONDITIONS

V

Supply Voltage 2.7 5 5.5 V -

DD

V

High-Level Input Voltage 2.0 - VDD V VDD = 2.7 V to 5.5 V

IH

Low-Level Input Voltage 0.0 - 0.8 V VDD = 2.7 V to 5.5 V

V

IL

Operating Free-Air Temperature

T

A

Range

Sensor
Electrical Characteristics

1

(T

= 25° C, V

A

-40 - +70 °C -

= 5 V unless otherwise noted)

DD

SYMBOL PARAMETER MIN TYP MAX UNITS TEST CONDITIONS

VOH High-Level Output Voltage 3 - 4.5 - V IOH = -4 mA

Low-Level Output Voltage 3 - 0.25 - V IOL = 4 mA

V

OL

High-Level Input Current - - 5 µ -

I

IH

Low-Level Input Current - - 5 µ -

I

IL

I

t

r

Supply Current

- 2 3 mA Power on

DD

2

- Full-Scale Frequency

Temperature Coefficient of

­Output Frequency

Typical Temperature Rise Time

, tf

Typical Temperature Fall Time

- 600 - kHz -

- ±200 - ppm/°C

λ ≤ 700 nm, -25° C ≤ T
ppm/° C

≤ 70° C / ± 200

A

- 100 - µ sec. -

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.

OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Issue A.3 04/07

Page 3 of 6

Reflective Color Sensor Assembly

OPB780Z

Coupled Characteristics

1

(VDD = 5 V, T

RED

SYMBOL PARAMETER

S2=L/S3=L

16.0 K 3.5 K 2.7 K 23.9 K

kHz

Output Frequency

See note

(9)

4.0 K 7.5 K 5.2 K 19.9 K

2.2 K 3.4 K 9.5 K 16.1 K

35.7 K 35.8 K 39.3 K 126.0 K

Notes:
(1) All voltage values are with respect to GND.

Typical Electro-Optical Characteristics Curves

Spectral Response

with Hoya CM230 Filter (not included)

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

Relative R esponsivity

0.1

0.0

300 500 700 900 1100

λp Wavelength (nm)

No rmalized to

Clear @ 530 nm

TA = 25° C

= 25 °C, IF = 5mA)

A

GREEN

S2=H/S3=H

BLUE

S2=L/S3=H

TYPICAL

OPB780Z Sensor -

CLEAR

S2=H/S3=L

Relative Responsivity

PARAMETER

IF = 5 mA, D = 0.225 inch, with red target

IF = 5 mA, D = 0.225 inch, with green target

I

= 5 mA, D = 0.225 inch, with blue target

F

I

= 5 mA, D = 0.225 inch, with white target

F

Spectral Response

Photodiode Spectral Responsivity

1.0

0.9

0.8

0.7

0.6

0.5

0.4

0.3

0.2

0.1

0.0
300 500 700 900 1100

No rmalized to

Clear @ 680 nm

TA = 25° C

λp Wavelength (nm)

Issue A.3 04/07
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.

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006

Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Reflective Color Sensor Assembly

C

OPB780Z

OPB780Z Sensor & LED - Typical Electro-Optical Characteristics Curves

Sensor Radiation Diagram

0° 10° 20°

TA = 25°

1.0

0.9

0.8

0.7

0.5 0.3 0.1 0.2 0.4

Spectrum

LED Spectrum

1.2

1.0

0.8

0.6

(a.u.)

0.4

0.2

Relative Emission Intensity

0.0
350 450 550 650 750

Wavele ngth λ p (nm )

30°

40°

50°

60°

70°

80°

90°

0.6

TA = 25° C

= 20 mA

I

F

0.35

0.34

0.33

Y

0.32

0.31

0.30

Y

LED Directivity

Forwa rd Curre nt vs Chrom a ti ci ty

Coordinate

TA = 25° C

1 mA

5 mA

20 mA

50 mA

100 mA

0.29 0.30 0.31 0.32 0.33 0.34

X

Ambient Temperature vs Chromaticity

Coordinate

0.35

IFP = 20 mA

0.34

0.33

0.32

50° C

0.31
85° C

0.30

0.29 0.30 0.31 0.32 0.33 0.34

-30° C

0°

25° C

X

TA = 25° C
I

= 20 mA

F

Relative Luminosity (a.u.)

Radiation Angle

OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006
Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Issue A.3 04/07

Page 5 of 6

Reflective Color Sensor Assembly

A

)

)

)

A

OPB780Z

OPB780Z LED - Typical Electro-Optical Characteristics Curves

Forward Voltage vs Forward

Current

1000

TA = 25o C

(mA)

FP

100

10

Forward C urrent I

1

2.5 3.0 3.5 4.0 4.5 5.0

Forward Voltage VF (V)

Duty Ratio vs Allowable

Forward Current

1000

100

(mA)

FP

I

TA = 25o C

Forward Current vs Relative

Luminousity

4.0

Re la tive Lum inous ity (a.u.

(V)

F

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

5.4

5.0

4.6

4.2

3.8

3.4

TA = 25o C

0 20 40 60 80 100 120

Forward Current IFP (mA)

mbient Temperature vs Forw ard

Voltage

IFP = 60 mA

= 20 mA

I

FP

= 5 mA

I

FP

3.0

Forward Voltage V

Allowable Forwa rd Curre nt

10

1 10 100

Duty Ratio (%)

Ambient Temperature vs Relative

Luminosity

10.0

IFP = 20 mA

2.6

-40 -20 0 20 40 60 80 100

Ambient Tempera ture TA (oC)

mbient Temperature vs Allowable

For w a r d Cur r e nt

40

30

1.0

20

(mA)

F

I

10

Issue A.3 04/07
Page 6 of 6

Relative Luminosity (a.u.

0.1

-40 -20 0 20 40 60 80 100

Ambient Temperature T(°C

OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.

Phone: [phone] or [phone] FAX: [phone] [e-mail] www.optekinc.com

Allowable Forward Current

0

0 20406080100

Ambient Temperature T

OPTEK Technology Inc. — 1645 Wallace Drive, Carrollton, Texas 75006

(oC)

A