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PDF TSL235R Data sheet ( Hoja de datos )
| Número de pieza | TSL235R | |
| Descripción | LIGHTTOFREQUENCY CONVERTER | |
| Fabricantes | ETC | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TSL235R (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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t
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D High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D Communicates Directly With a
Microcontroller
D Compact Three-Leaded Clear-Plastic
Package
D Single-Supply Operation Down to 2.7 V
D Nonlinearity Error Typically 0.2% at 100 kHz
D Stable 150 ppm/°C Temperature Coefficient
D Single-Supply Operation
TSL235R
LIGHTĆTOĆFREQUENCY CONVERTER
PACKAGE
(FRONT VIEW)
TAOS038 – APRIL 2002
1 23
GND VDD OUT
Description
The TSL235R 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 TSL235R is characterized for operation over the temperature range of –25°C to 70°C and is supplied in
a 3-lead clear plastic side-looker package with an integral lens.
Functional Block Diagram
Light
Photodiode
Current-to-Frequency
Converter
Output
The LUMENOLOGYr Company
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205 S Plano, TX 75074 S (972t) 673-0759
www.taosinc.com
Copyright E 2002, TAOS Inc.
1
1 page  
TSL235R
LIGHTĆTOĆFREQUENCY CONVERTER
APPLICATION INFORMATION
TAOS038 – APRIL 2002
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
TSL235R (Figure 6).
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.
VDD
0.1 µF
2
3
TSL235R
1
Timer/Port
MCU
Figure 6. Typical TSL235R Interface to a Microcontroller
The LUMENOLOGYr Company
t
www.taosinc.com
t
Copyright E 2002, TAOS Inc.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet TSL235R.PDF ] | |
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