OPTEK OPB780Z Technical data

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