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PDF TSL237T Data sheet ( Hoja de datos )
| Número de pieza | TSL237T | |
| Descripción | HIGH-SENSITIVITY LIGHT-TO-FREQUENCY CONVERTER | |
| Fabricantes | TAOS | |
| Logotipo |  |
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D High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D High Irradiance Responsivity . . .
1.2 kHz/(mW/cm2) at λp = 640 nm
D Low Dark Frequency . . . < 2 Hz at 505 C
D Single-Supply Operation . . . 2.7 V to 5.5 V
D Stable 200 ppm/°C Temperature Coefficient
D Communicates Directly with a
Microcontroller
D RoHS Compliant
TSL237T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS055J − DECEMBER 2007
PACKAGE T
4-LEAD SMD
(TOP VIEW)
OE 1
4 OUT
GND 2
3 VDD
Description
The TSL237T 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 TSL237T is characterized for operation over the temperature range of −40°C to 85°C and is supplied in
a compact 4-lead surface-mount package.
Functional Block Diagram
Light
Photodiode
Current-to-Frequency
Converter
Output
OE
Available Options
DEVICE
TSL237T
TA
−40°C to 85°
PACKAGE − LEADS
4-lead Low Profile Surface Mount
PACKAGE DESIGNATOR ORDERING NUMBER
T TSL237T
Terminal Functions
TERMINAL
NAME
T PKG
NO.
GND
2
OE 1
OUT
4
VDD
3
TYPE
I
O
DESCRIPTION
Power supply ground (substrate). All voltages are referenced to GND.
Enable for fO (active low).
Output frequency.
Supply voltage.
The
LUMENOLOGY
r
Company
Texas
Advarnced
Optoelectronic
Solutions
Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2007, TAOS Inc.
1
1 page  
TSL237T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS055J − DECEMBER 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
TSL237T (Figure 9). A low-noise power supply is required to minimize jitter on output pulse.
VDD
0.1 μF
VDD
TSL237T
OUT
GND
OE
Timer / Port
MCU
Figure 9. Typical TSL237T Interface to a Microcontroller
Device Operational Details
The frequency at the output pin (OUT) is given by:
fO = fD + (Re) (Ee)
where:
fO
fD
Re
Ee
is the output frequency
is the output frequency for dark condition (Ee = 0)
is the device responsivity for a given wavelength of light given in kHz/(μW/cm2)
is the incident irradiance in μW/cm2
fD is a constant error term in the output frequency calculation resulting from leakage currents, and is
independent of light intensity. The TSL237T die is trimmed to minimize the magnitude of this dark frequency
component so that it can be neglected in the transfer function calculation. In many applications, measurement
of the actual dark frequency may be impractical due to measurement times ranging from several seconds to
several minutes, and the fact that some devices may never transition (zero dark frequency).
Input Interface
A low-impedance electrical connection between the device OE terminal and the device GND terminal is required
for improved noise immunity.
Output Interface
The output of the device is designed to drive a CMOS logic input over short distances. If lines greater than 12
inches in length are used on the output, a buffer or line driver is recommended.
The LUMENOLOGY r Company
r
Copyright E 2007, TAOS Inc.
www.taosinc.com
r
5
5 Page 
TSL237T
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS055J − DECEMBER 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.
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.
The LUMENOLOGY r Company
r
www.taosinc.com
r
Copyright E 2007, TAOS Inc.
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TSL237T.PDF ] | |
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