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TSL235R

LIGHT-TO-FREQUENCY CONVERTER

TAOS038E −SEPTEMBER 2007

The LUMENOLOGY r Company

www.taosinc.com

D High-Resolution Conversion of Light

Intensity to Frequency With No External

Components

D Communicates Directly With a

Microcontroller

D Compact Three-Leaded Clear-Plastic

Package

D Single-Supply Operation Down to 2.7 V

D Nonlinearity Error Typically 0.2% at 100 kHz

D Stable 150 ppm/°C Temperature Coefficient

D Single-Supply Operation

D RoHS Compliant (−LF Package Only)

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 T

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.

Texas Advanced Optoelectronic Solutions Inc.

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

PACKAGE S

SIDELOOKER

(FRONT VIEW)

GND

OUT

PACKAGE SM

SURFACE MOUNT

SIDELOOKER

(FRONT VIEW)

GND

OUT

Summary of content (10 pages)

PAGE 1
TSL235R LIGHT-TO-FREQUENCY CONVERTER r r TAOS038E −SEPTEMBER 2007 D High-Resolution Conversion of Light PACKAGE S SIDELOOKER (FRONT VIEW) Intensity to Frequency With No External Components Communicates Directly With a Microcontroller Compact Three-Leaded Clear-Plastic Package Single-Supply Operation Down to 2.7 V Nonlinearity Error Typically 0.
PAGE 2
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted)† Supply voltage, VDD (see Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 V Operating free-air temperature range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −25°C to 70°C Storage temperature range, Tstg . . . . . . . . . . .
PAGE 3
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 TYPICAL CHARACTERISTICS OUTPUT FREQUENCY vs IRRADIANCE PHOTODIODE SPECTRAL RESPONSIVITY 1.2 1000 VDD = 5 V λp = 635 nm TA = 25°C 1.0 Normalized Responsivity fO — Output Frequency — kHz 100 10 1 0.1 0.8 0.6 0.4 0.01 0.2 0.001 0.001 0.01 0.1 1 10 10 0 0 300 1k 400 500 Ee − Irradiance − μW/cm2 600 700 800 900 λ − Wavelength − nm Figure 1 VDD = 5 V Ee = 0 fO(dark) — Dark Frequency — Hz 1 0.8 0.6 0.4 0.
PAGE 4
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 TYPICAL CHARACTERISTICS OUTPUT FREQUENCY vs SUPPLY VOLTAGE 1.010 TA = 25°C fO = 250 kHz Normalized Output Frequency 1.005 1.000 0.995 0.990 0.985 0.980 2.5 3 3.5 4 4.5 5 5.5 VDD − Supply Voltage − V Figure 5 Copyright E 2007, TAOS Inc. 4 The LUMENOLOGY r Company r www.taosinc.
PAGE 5
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 APPLICATION INFORMATION Power-supply considerations Power-supply lines must be decoupled by a 0.01-μF to 0.1-μF capacitor with short leads placed close to the TSL235R (Figure 6). Output interface The output of the device is designed to drive a standard TTL or CMOS logic input over short distances. If lines greater than 12 inches are used on the output, a buffer or line driver is recommended.
PAGE 6
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 APPLICATION INFORMATION PCB Pad Layout Suggested PCB pad layout guidelines for the SM surface mount package are shown in Figure 7. 1.0 1.0 1.0 3.2 1.0 1.0 NOTES: A. All linear dimensions are in millimeters. B. This drawing is subject to change without notice. Figure 7. Suggested SM Package PCB Layout Copyright E 2007, TAOS Inc. 6 The LUMENOLOGY r Company r www.taosinc.
PAGE 7
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 MECHANICAL DATA The device is supplied in a clear plastic three-lead through-hole sidelooker package (S). PACKAGE S PLASTIC SINGLE-IN-LINE SIDE-LOOKER PACKAGE TOP VIEW 4.60 2.60 R 0.90 1.64 FRONT VIEW SIDE VIEW 2.30 0.15 Note B 1.80 4.60 1 1.56 0.42 14.86 + 0.50 Pb 2y2 Lead Free Available 0.47 TYP 0.42 NOTES: A. All linear dimensions are in millimeters; tolerance is ± 0.25 mm unless otherwise stated. B.
PAGE 8
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 MECHANICAL DATA PACKAGE SM PLASTIC SURFACE MOUNT SIDE-LOOKER PACKAGE TOP VIEW 4.60 R 0.90 2.60 1.64 FRONT VIEW SIDE VIEW 0.15 Note B 2.30 1.80 4.60 0.62 + 0.10 1.00 1.97 0.42 0.62 +0.10 −0.15 5.73 + 0.50 Pb 2y2 NOTES: A. B. C. D. E. F. 2.59 0.47 TYP 0.42 Lead Free All linear dimensions are in millimeters; tolerance is ± 0.25 mm unless otherwise stated.
PAGE 9
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 PRODUCTION DATA — information in this document is current at publication date. Products conform to specifications in accordance with the terms of Texas Advanced Optoelectronic Solutions, Inc. standard warranty. Production processing does not necessarily include testing of all parameters.
PAGE 10
TSL235R LIGHT-TO-FREQUENCY CONVERTER TAOS038E −SEPTEMBER 2007 Copyright E 2007, TAOS Inc. 10 The LUMENOLOGY r Company r www.taosinc.