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PDF TSL237 Data sheet ( Hoja de datos )
| Número de pieza | TSL237 | |
| Descripción | High-Sensitivity Light-to-Frequency Converter | |
| Fabricantes | ams | |
| Logotipo |  |
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TSL237
High-Sensitivity Light-to-Frequency
Converter
General 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 320nm to 700nm and
responds over the light range of 320nm to 1050nm. 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 ams for information.
Ordering Information and Content Guide appear at end of
datasheet.
Figure 1:
Added Value of Using TSL237
Key Benefits & Features
The benefits and features of TSL237, High-Sensitivity
Light-to-Frequency Converter are listed below:
Benefits
• High-Resolution Conversion of Light Intensity to
Frequency with No External Components
• Provides Low Light Level Operation
• Provides for High Sensitivity to Detect a Small
Change in Light
• Provides Additional Sensitivity Advantages
Features
• 5M:1 Input Dynamic Range
• Low Dark Frequency of 0.1 Hz (typical)
• High Irradiance Responsivity
2.3kHz/(μW/cm2) @ λp = 524nm
• 2x Gain Lens
• Low Dark Frequency: < 2Hz at 50°C
• Single-Supply Operation: 2.7V to 5.5V
• Stable 200ppm/°C Temperature Coefficient
• Interfaces Directly to a Microcontroller
• RoHS Compliant (-LF Package Only)
ams Datasheet
[v1-00] 2016-Jul-22
Page 1
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1 page  
TSL237 − Electrical Characteristics
Electrical Characteristics
Figure 6:
Recommended Operating Conditions
All limits are guaranteed. The parameters with min and max
values are guaranteed with production tests or
SQC (Statistical Quality Control) methods.
Symbol
Parameter
VDD Supply voltage
TA Operating free-air temperature
Min Nom Max Unit
2.7 5 5.5 V
-40 70 °C
Figure 7:
Electrical Characteristics at VDD = 5V, TA = 25°C (unless otherwise noted)
Symbol
Parameter
Test Conditions Min Typ Max Units
VOH High-level output voltage IOH = -1mA
VOL Low-level output voltage IOL = 1mA
IDD Supply current
Full-scale frequency (1)
4 4.5
V
0.25 0.4
V
23
mA
500
1000
kHz
Temperature coefficient of
responsivity
Wavelength < 600nm,
fO = 50kHz
kSVS Supply-voltage sensitivity VDD = 5V ± 10%
±200
±0.5
ppm/°C
%/V
Note(s):
1. Full-scale frequency is the maximum operating frequency of the device without saturation.
ams Datasheet
[v1-00] 2016-Jul-22
Page 5
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TSL237 − Application Information
Application Information
Power-Supply Considerations
Power-supply lines must be decoupled by
a 0.01μF to 0.1μF capacitor with short leads placed close to the
TSL237 (Figure 17). A low-noise power supply is required to
minimize jitter on output pulse.
Figure 17:
Typical TSL237 Interface to a Microcontroller
VDD
0.1 μF
VDD
TSL237
OUT
GND
Timer / Port
MCU
ams Datasheet
[v1-00] 2016-Jul-22
Device Operational Details
The frequency at the output pin (OUT) is given by:
(EQ1) fO = fD + (Re)(Ee)
where:
fO is the output frequency
fD is the output frequency for dark condition (Ee = 0)
Re is the device responsivity for a given wavelength of light
given in kHz/(μW/cm2)
Ee is the incident irradiance in μW/cm2
Page 11
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| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet TSL237.PDF ] | |
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