TSL245RSM-LF - Texas Advanced Optoelectronic Solutions

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

The LUMENOLOGY r Company r

www.taosinc.com

DHigh-Resolution Conversion of Light

Intensity to Frequency With No External

Components

DCommunicates Directly With a

Microcontroller

DCompact Three-Leaded Plastic Package

DIntegral Visible-Light Cutoff Filter

DSingle-Supply Operation . . . 2.7 V to 5.5 V

DHigh Irradiance Responsivity ...Typically

500 Hz/(μW/cm2) at 940 nm

DNonlinearity Error Typically 0.2% at 100 kHz

DAvailable in Through-Hole and Surface

Mount Three-Lead Sidelooker Packages

DReplacement for TSL245

DLead (Pb) Free Package Option Available

Description

The TSL245R 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 TSL245R is characterized for operation over the temperature range

of −25°C to 70°C and is supplied in a 3-lead plastic side-looker package with an integral visible-light cutoff filter

and lens. When supplied in the lead (Pb) free package, the devices are RoHS compliant.

Functional Block Diagram

Light Current-to-Frequency

Converter

Photodiode Output

Available Options

DEVICE TAPACKAGE − LEADS PACKAGE DESIGNATOR ORDERING NUMBER

TSL245R −25°C to 70°3-lead Sidelooker S TSL245R

TSL245R −25°C to 70°3-lead Sidelooker — Lead (Pb) Free S TSL245R−LF

TSL245R −25°C to 70°3-lead Surface Mount Sidelooker SM TSL245RSM

TSL245R −25°C to 70°3-lead Surface Mount Side-Looker — Lead (Pb)

Free

SM TSL245RSM−LF

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

VDD

OUT

PACKAGE SM

SURFACE MOUNT

SIDELOOKER

(FRONT VIEW)

GND

VDD

OUT

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

www.taosinc.com

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 voltage.

VDD 2Supply voltage.

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 −25°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds (S Package) 260°C. . . . . . . . . . . . . . . . . . . .

Reflow solder, in accordance with J-STD-020C or J-STD-020D (SM Package) 260°C. . . . . . . . . . . . . . . . . . .

†Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and

functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not

implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

NOTE 1: All voltage values are with respect to GND.

Recommended Operating Conditions

MIN NOM MAX UNIT

Supply voltage, VDD 2.7 5 5.5 V

Operating free-air temperature range, TA−25 70 °C

Electrical Characteristics at VDD = 5 V, TA = 25°C (unless otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VOH High-level output voltage IOH = −4 mA 4 4.5 V

VOL Low-level output voltage IOL = 4 mA 0.25 0.4 V

IDD Supply current 2 3 mA

Full-scale frequency‡500 kHz

kSVS Supply-voltage sensitivity VDD = 5 V ±10% ±0.5 %/ V

‡Full-scale frequency is the maximum operating frequency of the device without saturation.

Operating Characteristics at VDD = 5 V, TA = 25°C, λp = 940 nm

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

fOOutput frequency Ee = 40 μW/cm210 20 30 kHz

fDDark frequency Ee = 0 μW/cm20.4 10 Hz

ReIrradiance responsivity 0.5 kHz/(μW/

cm2)

Nli it

fO = 0 kHz to 10 kHz ±0.1% %F.S.

Nonlinearity §

fO = 0 kHz to 100 kHz ±0.2% %F.S.

Step response to full-scale step input 1 pulse of new

frequency plus 1 μs

§Nonlinearity is defined as the deviation of fO from a straight line between zero and full scale, expressed as a percent of full scale.

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

The LUMENOLOGY r Company r

www.taosinc.com

TYPICAL CHARACTERISTICS

Figure 1

OUTPUT FREQUENCY

IRRADIANCE

Ee − Irradiance − μW/cm2

Output Frequency (fO − fD) — kHz

0.001

0.01

0.1

100

1000

0.001 0.01 1 10 10000.1 100

VDD = 5 V

λp = 940 nm

TA = 25°C

Figure 2

PHOTODIODE SPECTRAL RESPONSE

λ − Wavelength − nm

TA = 25°C

0.2

0.4

0.6

0.8

Relative Responsivity

700 800 900 1000 1100600

Figure 3

DARK FREQUENCY

TEMPERATURE

VDD = 5 V

Ee = 0

TA − Temperature − °C

−25 0 25 50 75

0.2

0.4

0.6

0.8

1.2

fO(dark) — Dark Frequency — Hz

Figure 4

OUTPUT FREQUENCY

SUPPLY VOLTAGE

VDD − Supply Voltage − V

Normalized Output Frequency

2.5 3 3.5 4 4.5 5

0.980

0.985

0.990

0.995

1.000

1.005

1.010

5.5

VDD = 5 V

TA = 25°C

fO = 20 kHz

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

www.taosinc.com

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

TSL245R (Figure 5). A low-noise power supply is required to minimize jitter on output pulse.

TSL245R Timer / Port

MCU

0.1 μF

VDD

Figure 5. Typical TSL245R Interface to a Microcontroller

Device Operational Details

The frequency at the output pin (OUT) is given by:

fO = fD + (Re) (Ee)

where:

fOis the output frequency

fDis the output frequency for dark condition (Ee = 0)

Reis the device responsivity for a given wavelength of light given in kHz/(μW/cm2)

Eeis the incident irradiance in μW/cm2

fD is an output frequency resulting from leakage currents. As shown in the equation above, this frequency

represents a light-independent term in the total output frequency fO. At very low light levels, this dark frequency

can be a significant portion of fO. The dark frequency is temperature dependent. For optimum performance of

any given device over the full output range, the value of fD should be measured (in the absence of light) and

later subtracted from subsequent light measurement (see Figure 1).

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.

Measuring the frequency

The choice of interface and measurement technique depends on the desired resolution and data-acquisition

rate. For maximum data-acquisition rate, period-measurement techniques are used.

Period measurement requires the use of a fast reference clock with available resolution directly related to

reference-clock rate. The technique is employed to measure rapidly varying light levels or to make a fast

measurement of a constant light source.

Maximum resolution and accuracy may be obtained using frequency-measurement, pulse-accumulation,

or integration techniques. Frequency measurements provide the added benefit of averaging out random- or

high-frequency variations (jitter) resulting from noise in the light signal. Resolution is limited mainly by available

counter registers and allowable measurement time. Frequency measurement is well suited for slowly varying

or constant light levels and for reading average light levels over short periods of time. Integration, the

accumulation of pulses over a very long period of time, can be used to measure exposure — the amount of light

present in an area over a given time period.

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

The LUMENOLOGY r Company r

www.taosinc.com

APPLICATION INFORMATION

PCB Pad Layout

Suggested PCB pad layout guidelines for the SM surface mount package are shown in Figure 6.

3.2

1.0 1.0 1.0

1.01.0

NOTES: A. All linear dimensions are in millimeters.

B. This drawing is subject to change without notice.

Figure 6. Suggested SM Package PCB Layout

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

www.taosinc.com

MECHANICAL DATA

PACKAGE S PLASTIC SINGLE-IN-LINE SIDE-LOOKER PACKAGE

1.642.60

2.30

4.60

R 0.90

1.80

0.42

2 2

0.47 TYP

TOP VIEW

SIDE VIEWFRONT VIEW

0.42

1.56

14.86  0.50

4.60

0.15

Note B

Lead Free

Available

NOTES: A. All linear dimensions are in millimeters; tolerance is ± 0.25 mm unless otherwise stated.

B. Dimension is to center of lens arc, which is located below the package face.

C. The 0.96 mm × 0.96 mm integrated photodiode active area is typically located in the center of the lens and 0.97 mm below the top

of the lens surface.

D. Lead finish for TSL245R: solder dipped, 63% Sn/37% Pb. Lead finish for TSL245xR−LF: solder dipped, 100% Sn.

E. This drawing is subject to change without notice.

Figure 7. Package S — Single-In-Line Side-Looker Package Configuration

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

The LUMENOLOGY r Company r

www.taosinc.com

MECHANICAL DATA

PACKAGE SM PLASTIC SURFACE MOUNT SIDE-LOOKER PACKAGE

1.642.60

2.30

4.60

R 0.90

1.80

0.42

1.00

0.47 TYP

TOP VIEW

SIDE VIEWFRONT VIEW

0.42

5.73  0.50

4.60

0.15 Note B

2.59

0.62  0.10 1.97

0.62 +0.10

−0.15

Lead Free

2 2

NOTES: A. All linear dimensions are in millimeters; tolerance is ± 0.25 mm unless otherwise stated.

B. Dimension is to center of lens arc, which is located below the package face.

C. The 0.96 mm × 0.96 mm integrated photodiode active area is typically located in the center of the lens and 0.97 mm below the top

of the lens surface.

D. Lead finish for TSL245RSM: solder dipped, 63% Sn/37% Pb. Lead finish for TSL245xRSM−LF: solder dipped, 100% Sn.

E. This drawing is subject to change without notice.

Figure 8. Package SM — Surface Mount Side-Looker Package Configuration

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

www.taosinc.com

MECHANICAL DATA

4.00

2.00

8.00

1.75

11.50

24 +0.30 −0.10

 1.50

 1.50  0.25

TOP VIEW

DETAIL A DETAIL B

5.50

11.00

2.70

0.343

 0.013

8 Max

4 Max

NOTES: A. All linear dimensions are in millimeters, dimension tolerance is ± 0.10 mm unless otherwise noted.

B. The dimensions on this drawing are for illustrative purposes only. Dimensions of an actual carrier may vary slightly.

C. Symbols on drawing Ao, Bo, and Ko are defined in ANSI EIA Standard 481−B 2001.

D. Each reel is 33 millimeters in diameter and contains 2500 parts.

E. TAOS packaging tape and reel conform to the requirements of EIA Standard 481−B.

F. Only surface mount parts (package SM) are supplied in tape and reel.

G. This drawing is subject to change without notice.

Figure 9. Package SM Carrier Tape

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007

The LUMENOLOGY r Company r

www.taosinc.com

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.

LEAD-FREE (Pb-FREE) and GREEN STATEMENT

Pb-Free (RoHS) TAOS’ terms Lead-Free or Pb-Free mean semiconductor products that are compatible with the current

RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous

materials. Where designed to be soldered at high temperatures, TAOS Pb-Free products are suitable for use in specified

lead-free processes.

Green (RoHS & no Sb/Br) TAOS defines Green to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and

Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material).

Important Information and Disclaimer The information provided in this statement represents TAOS’ knowledge and

belief as of the date that it is provided. TAOS bases its knowledge and belief on information provided by third parties,

and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate

information from third parties. TAOS has taken and continues to take reasonable steps to provide representative

and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and

chemicals. TAOS and TAOS suppliers consider certain information to be proprietary, and thus CAS numbers and other

limited information may not be available for release.

NOTICE

Texas Advanced Optoelectronic Solutions, Inc. (TAOS) reserves the right to make changes to the products contained in this

document to improve performance or for any other purpose, or to discontinue them without notice. Customers are advised

to contact TAOS to obtain the latest product information before placing orders or designing TAOS products into systems.

TAOS assumes no responsibility for the use of any products or circuits described in this document or customer product

design, conveys no license, either expressed or implied, under any patent or other right, and makes no representation that

the circuits are free of patent infringement. TAOS further makes no claim as to the suitability of its products for any particular

purpose, nor does TAOS assume any liability arising out of the use of any product or circuit, and specifically disclaims any

and all liability, including without limitation consequential or incidental damages.

TEXAS ADVANCED OPTOELECTRONIC SOLUTIONS, INC. PRODUCTS ARE NOT DESIGNED OR INTENDED FOR

USE IN CRITICAL APPLICATIONS IN WHICH THE FAILURE OR MALFUNCTION OF THE TAOS PRODUCT MAY

RESULT IN PERSONAL INJURY OR DEATH. USE OF TAOS PRODUCTS IN LIFE SUPPORT SYSTEMS IS EXPRESSLY

UNAUTHORIZED AND ANY SUCH USE BY A CUSTOMER IS COMPLETELY AT THE CUSTOMER’S RISK.

LUMENOLOGY, TAOS, the TAOS logo, and Texas Advanced Optoelectronic Solutions are registered trademarks of Texas Advanced

Optoelectronic Solutions Incorporated.

TSL245R

INFRARED LIGHT-TO-FREQUENCY CONVERTER

TAOS060D − SEPTEMBER 2007