TSL230RD, TSL230ARD, TSL230BRD

PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS

TAOS054P − OCTOBER 2007

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The LUMENOLOGY r Company

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Copyright E 2007, TAOS Inc.

www.taosinc.com

Intensity to Frequency With No External

Components

Output Frequency

Compliant Surface-Mount Package

Description

The TSL230RD, TSL230ARD, and TSL230BRD programmable light-to-frequency converters combine a

configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated

circuit. The output can be either a pulse train or a square wave (50% duty cycle) with frequency directly

proportional to light intensity. Device sensitivity is selectable in three ranges, providing two decades of

adjustment. The full-scale output frequency can be scaled by one of four preset values. All inputs and the output

are TTL compatible, allowing direct two-way communication with a microcontroller for programming and output

interface. The output enable (OE) places the output in the high-impedance state for multiple-unit sharing of a

microcontroller input line.

The devices are available with absolute output frequency tolerances of ±10% (TSL230BRD), ±15%

(TSL230ARD), and ±20% (TSL230RD). They have been temperature compensated for the ultraviolet-to-visible

light range of 320 nm to 700 nm and respond over the light range of 320 nm to 1050 nm. The devices are

characterized over the temperature range of −25°C to 70°C.

Functional Block Diagram

Light

Current-to-Frequency

Converter

Photodiode Array

S0

S1

S2

S3

OE

Output

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Texas Advanced Optoelectronic Solutions Inc.

1001 Klein Road S Suite 300 S Plano, TX 75074 S (972) 673-0759

8 S3

7 S2

6 OUT

PACKAGE D

8-LEAD SOIC

(TOP VIEW)

S0 1

S1 2

OE 3

GND 4