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PDF TSL237 Data sheet ( Hoja de datos )
| Número de pieza | TSL237 | |
| 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 . . .
2.3 kHz/(mW/cm2) at λp = 524 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 Interfaces Directly to a Microcontroller
D RoHS Compliant (−LF Package Only)
TSL237
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS052J − SEPTEMBER 2008
PACKAGE S
SIDELOOKER
(FRONT VIEW)
PACKAGE SM
SURFACE MOUNT
SIDELOOKER
(FRONT VIEW)
123
GND VDD OUT
123
GND VDD OUT
Description
The TSL237 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 TSL237 is characterized for operation over the temperature range of −40°C to 85°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.
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
TSL237
TSL237
TSL237
TA
−40°C to 70°C
−40°C to 70°C
−40°C to 70°C
PACKAGE − LEADS
3-lead Sidelooker
3-lead Sidelooker — Lead (Pb) Free
3-lead Surface-Mount Sidelooker — Lead (Pb) Free
PACKAGE DESIGNATOR ORDERING NUMBER
S TSL237S
S TSL237S−LF
SM TSL237SM−LF
The LUMENOLOGY r Company
r
Texas Advanced Optoelectronic Solutions Inc.
1001 Klein Road S Suite 300 S Plano, TX 75074 S (972r) 673-0759
www.taosinc.com
Copyright E 2008, TAOS Inc.
1
1 page  
TSL237
HIGH-SENSITIVITY
LIGHT-TO-FREQUENCY CONVERTER
TAOS052J − SEPTEMBER 2008
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
TSL237 (Figure 9). A low-noise power supply is required to minimize jitter on output pulse.
VDD
0.1 μF
VDD
TSL237
OUT
GND
Timer / Port
MCU
Figure 9. Typical TSL237 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 TSL237 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).
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
www.taosinc.com
r
Copyright E 2008, TAOS Inc.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet TSL237.PDF ] | |
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