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High-Resolution conversion of Light intensity to Frequency
Communicates Directly with a Microcontroller
Single-Supply Operation (2.7V to 5.5V)
Nonlinearity Error Typically 0.2% at 50 kHz
Stable 200 ppm/擄C Temperature Coefficient
Product Photo Here
Description:
The OPB780 programmable color light-to-frequency converter combines configurable silicon photodiodes and a current-to-
frequency converter on single monolithic CMOS integrated circuit. The output is a square wave (50% duty cycle) with
frequency directly proportional to light intensity (irradiance). The full-scale output frequency can be scaled by one of three
preset values via two control input pins. Digital inputs and digital output allow direct interface to a microcontroller or other
logic circuitry. Output enable (OE@) places the output in the high-impedance state for multiple-unit sharing of a
microcontroller input line.
The light-to-frequency converter reads an 8 x 8 array of photodiodes. Sixteen photodiodes have blue filters, 16 photodiodes
have green filters, 16 photodiodes have red filters, and 16 photodiodes are clear with no filters. The four types (colors) of
photodiodes are interdigitated to minimize the effect of non-uniformity of incident irradiance. All 16 photodiodes of the same
color are connected in parallel and which type of photodiode the device uses during operation is pin-selectable.
Applications:
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Bill Validation
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Object Color Recognition
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Pill Verification
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Vending Machine Object Verification
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Identification of Paint Color
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Badge Color Identification
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Monitor to Printer Matching
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Etc.
OPB780
Ordering Information
Programmable Color Light-To-Frequency converter
Color-
Pin #
1
2
3
4
5
6
7
8
Description
SO
S1
OE
Ground
VDD
Output
S2
S3
RoHS
OPTEK reserves the right to make changes at any time in order to improve design and to supply the best product possible.
Issue A
05/05
Page 1 of 3
OPTEK Technology Inc. 鈥?/div>
1645 Wallace Drive, Carrollton, Texas 75006
Phone: (972) 323-2200 or (800) 341-4747
FAX: (972) 323-2396 sensors@optekinc.com www.optekinc.com
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