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OPB780-KIT

Color Sensor Evaluation Kit

TT Electronics. 

OPB780-Kit

Color Sensor Evaluation Kit

• The OPB780-Kit is designed to provide the design engineer an

easy way to evaluate the capability of the OPB780 Color Sensor.

The OPB780Z is a full color sensor with 4

different frequencies relating directly to a

specific color seen by the sensor.

Block

The OPB780Z color sensor uses a Light

programmable light-to-frequency

Photodiode Array

converter that combines 64 configurable

S2 S3

silicon photodiodes (on a 144 um center

array and measuring 120 um x 120 um

6

4

each) and a current-to-frequency

converter on a single monolithic CMOS integrated

circuit, packaged 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

7,8

frequency directly proportional to light chromaticity and

irradiance from four filtered diode arrays.

Current-to-Frequency

Converter

Out 3

SO

S3

6

S1

S2

4

OE

Out

3

Gnd

VDD

1,2

Cap (0.1µf)

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

photodiodes with clear filters. Each color’s group of 16

photodiodes is interdigitated to minimize the effect of

non-uniformity of incident irradiance. Each color’s

group is also connected in parallel. The type of

photodiode used during operation is pin-selectable.

The internal photodiode used by the device is controlled

by two logic inputs, S2 and S3.

Pin 4 (S2)

H

H

L

L

Pin 6 (S3)

H

L

L

H

Diode Filter

Green

Clear

Red

Blue

The output of the device is designed to drive a standard

TTL or CMOS logic input over short distances.

5

LED

Pin Name Pin #

VDD

1, 2

OUT

3

S2

4

LED Anode 5

S3

6

GND/OE 7, 8

Description

Supply voltage

Output Frequency (FO)

Photodiode type selection input

LED input

Photodiode type selection input

Sensor & LED Ground

DO NOT LOOK DIRECTLY AT LED

WITH UNSHIELDED EYES OR

DAMAGE TO RETINA MAY OCCUR.

The OPB780Z includes 10” [25.4cm] a Flat Flexible

interface Cable. Custom lengths of the cable can be

ordered either from OPTEK or most Flat Flexible Cable

(FFC) manufactures. The FFC is designed to interface

with an any standard 0.5mm spacing FFC connector

similar to the AVX ELCO connector.

(part number 04 6249 0080 00 800+).

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: (972) 323-2200 or (800) 341-4747

FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com

Issue A.2 11/09

Page 1 of 9

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