TSL230R−LF, TSL230AR−LF, TSL230BR−LF

PROGRAMMABLE LIGHT-TO-FREQUENCY CONVERTERS

TAOS079A − OCTOBER 2006

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The LUMENOLOGY r Company

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Copyright E 2006, TAOS Inc.

www.taosinc.com

Intensity to Frequency With No External

Components

Output Frequency

With Power-Down Feature

±5% (TSL230BR−LF)

TSL230A, TSL230AR, TSL230B and

TSL230BR

Description

The TSL230R−LF, TSL230AR−LF, and TSL230BR−LF programmable light-to-frequency converters combine

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

circuits. 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. An output enable (OE) is provided that 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 ±5% (TSL230BR−LF), ±10%

(TSL230AR−LF), or ±20% (TSL230R−LF). 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

DIP PACKAGE

(TOP VIEW)

S0 1

S1 2

OE 3

GND 4