TSL238D-TR

TSL238D-TR Datasheet

TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

Part	Datasheet
TSL238D-TR	TSL238D-TR (pdf)

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D High-Resolution Conversion of Light Intensity to Frequency With No External Components D High Irradiance Responsivity kHz/ mW/cm2 at λp = 524 nm D Low Dark Frequency < 2 Hz at 255 C D Single-Supply Operation V to V D Stable 200 ppm/°C Temperature Coefficient D Interfaces Directly to a Microcontroller D Lead Pb Free Package D RoHS Compliant TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073J − SEPTEMBER 2008 PACKAGE D 8-LEAD SOIC TOP VIEW NC 1 NC 2 NC 3 NC 4 8 OUT 7 VDD 6 GND 5 OE Description The TSL238 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. Output enable OE places the output in a high-impedance state for multiple-unit sharing of a microcontroller input line. 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 TSL238 is characterized for operation over the temperature range of −40°C to 85°C and is supplied in an 8-lead plastic small outline package. When supplied in the lead Pb free package, the device is RoHS compliant. For automotive and other extended temperature applications, please contact TAOS for information. Functional Block Diagram Light Photodiode Current-to-Frequency Converter Output Available Options DEVICE TSL238 TA −25°C to 70°C PACKAGE − LEADS 8-lead Plastic Small Outline IC PACKAGE DESIGNATOR ORDERING NUMBER TSL238D The LUMENOLOGY r Company Texas Advanced Optoelectronic Solutions Inc. 1001 Klein Road S Suite 300 S Plano, TX 75074 S 972r 673-0759 Copyright E 2008, TAOS Inc. 1 TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073J − SEPTEMBER 2008 Terminal Functions TERMINAL NAME D PKG NO. 1, 2, 3 TYPE Power supply ground. All voltages are referenced to GND. No connection. Substrate. Pin 4 is resistively connected to the substrate of the die, which is at the same potential as pin 4 must either be connected to pin 6 or left unconnected. Pin 4 cannot be used for a ground connection by itself. I Enable for fO active low . O Output frequency. Supply voltage. Absolute Maximum Ratings over operating free-air temperature range unless otherwise noted † Supply voltage, VDD see Note 1 6 V Input voltage range, VI V to VDD V Output current, IO ± 5 mA Short circuit of output to ground duration 5 s Operating free-air temperature range, TA see Note 2 −40°C to 85°C Storage temperature range, Tstg see Note 2 −40°C to 85°C Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature see Note 3 260°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. NOTES All voltage values are with respect to GND. Long-term storage or operation above 70°C could cause package yellowing that will lower the sensitivity to wavelengths < 500nm. The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds. Recommended Operating Conditions Supply voltage, VDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature range, TA x VDD 0 −40 NOM 5 MAX VDD 70 UNIT V °C Copyright E 2008, TAOS Inc. 2 The LUMENOLOGY r Company r TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER TAOS073J − SEPTEMBER 2008 Electrical Characteristics at VDD = 5 V, TA = 25°C Note 1 unless otherwise noted PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VOH VOL IIH IDD kSVS NOTES: High-level output voltage IOH = − 1 mA Low-level output voltage

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D High-Resolution Conversion of Light

Intensity to Frequency With No External Components

D High Irradiance Responsivity
kHz/ mW/cm2 at λp = 524 nm

D Low Dark Frequency < 2 Hz at 255 C D Single-Supply Operation V to V D Stable 200 ppm/°C Temperature Coefficient D Interfaces Directly to a Microcontroller D Lead Pb Free Package D RoHS Compliant

TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

TAOS073J − SEPTEMBER 2008

PACKAGE D 8-LEAD SOIC TOP VIEW

NC 1 NC 2 NC 3 NC 4
8 OUT 7 VDD 6 GND 5 OE

Description The TSL238 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. Output enable OE places the output in a high-impedance state for multiple-unit sharing of a microcontroller input line. 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 TSL238 is characterized for operation over the temperature range of −40°C to 85°C and is supplied in an 8-lead plastic small outline package. When supplied in the lead Pb free package, the device is RoHS compliant.

For automotive and other extended temperature applications, please contact TAOS for information.

Functional Block Diagram

Light

Photodiode

Current-to-Frequency Converter

Output

Available Options

DEVICE TSL238

TA −25°C to 70°C

PACKAGE − LEADS 8-lead Plastic Small Outline IC
PACKAGE DESIGNATOR ORDERING NUMBER

TSL238D

The LUMENOLOGY r Company

Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S 972r 673-0759

Copyright E 2008, TAOS Inc. 1

TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

TAOS073J − SEPTEMBER 2008

Terminal Functions

TERMINAL

NAME

D PKG NO.
1, 2, 3

TYPE

Power supply ground. All voltages are referenced to GND. No connection. Substrate. Pin 4 is resistively connected to the substrate of the die, which is at the same potential as pin 4 must either be connected to pin 6 or left unconnected. Pin 4 cannot be used for a ground connection by itself.

I Enable for fO active low . O Output frequency.

Supply voltage.

Absolute Maximum Ratings over operating free-air temperature range unless otherwise noted †

Supply voltage, VDD see Note 1 6 V Input voltage range, VI V to VDD V Output current, IO ± 5 mA Short circuit of output to ground duration 5 s Operating free-air temperature range, TA see Note 2 −40°C to 85°C Storage temperature range, Tstg see Note 2 −40°C to 85°C Solder conditions in accordance with JEDEC J−STD−020A, maximum temperature see Note 3 260°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.

NOTES All voltage values are with respect to GND. Long-term storage or operation above 70°C could cause package yellowing that will lower the sensitivity to wavelengths < 500nm. The device may be hand soldered provided that heat is applied only to the solder pad and no contact is made between the tip of the solder iron and the device lead. The maximum time heat should be applied to the device is 5 seconds.

Recommended Operating Conditions

Supply voltage, VDD High-level input voltage, VIH Low-level input voltage, VIL Operating free-air temperature range, TA
x VDD
0 −40

NOM 5

MAX VDD 70

UNIT V °C

Copyright E 2008, TAOS Inc. 2

The LUMENOLOGY r Company r

TSL238 HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER

TAOS073J − SEPTEMBER 2008

Electrical Characteristics at VDD = 5 V, TA = 25°C Note 1 unless otherwise noted

PARAMETER

TEST CONDITIONS

MIN TYP MAX UNIT

VOH VOL IIH IDD
kSVS NOTES:

High-level output voltage

IOH = − 1 mA

Low-level output voltage

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Datasheet ID: TSL238D-TR 519832