TSL235R

LIGHT-TO-FREQUENCY CONVERTER

TAOS038E −SEPTEMBER 2007

1

The LUMENOLOGY r Company

r

r

Copyright E 2007, TAOS Inc.

www.taosinc.com

Intensity to Frequency With No External

Components

Microcontroller

Package

Description

The TSL235R light-to-frequency converter combines a silicon photodiode and a current-to-frequency converter

on a single monolithic CMOS integrated circuit. Output is a square wave (50% duty cycle) with frequency directly

proportional to light intensity (irradiance) on the photodiode. The digital output allows direct interface to a

microcontroller or other logic circuitry. The device has been temperature compensated for the

ultraviolet-to-visible light range of 320 nm to 700 nm and responds over the light range of 320 nm to 1050 nm.

The TSL235R is characterized for operation over the temperature range of −25°C to 70°C and is supplied in

a 3-lead clear plastic side-looker package with an integral lens. When supplied in the lead (Pb) free package,

the device is RoHS compliant.

Functional Block Diagram

Light

Current-to-Frequency

Converter

Photodiode

Output

Available Options

DEVICE

PACKAGE − LEADS

PACKAGE DESIGNATOR ORDERING NUMBER

TSL235R −25°C to 70°C

3-lead Sidelooker

S

TSL235R

TSL235R −25°C to 70°C

3-lead Sidelooker—Lead (Pb) Free

S

TSL235R−LF

TSL235R −25°C to 70°C

3-lead Surface-Mount Sidelooker—Lead (Pb) Free

SM

TSL235RSM−LF

Terminal Functions

TERMINAL

TYPE

DESCRIPTION

NAME

NO.

TYPE

DESCRIPTION

GND

1

Power supply ground (substrate). All voltages are referenced to GND.

OUT

3

O

Output frequency.

2

Supply voltage.

r

r

Texas Advanced Optoelectronic Solutions Inc.

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

PACKAGE S

SIDELOOKER

(FRONT VIEW)

1

GND

2

3

OUT

PACKAGE SM

SURFACE MOUNT

SIDELOOKER

(FRONT VIEW)

1

GND

2

3

OUT