TSL230R, TSL230AR, TSL230BR
PROGRAMMABLE LIGHT TOFREQUENCY CONVERTERS
TAOS048 – OCTOBER 2002
1
The
LUMENOLOGY
r Company
t
t
Copyright
E 2002, TAOS Inc.
www.taosinc.com
D High-Resolution Conversion of Light
Intensity to Frequency With No External
Components
D Programmable Sensitivity and Full-Scale
Output Frequency
D Communicates Directly With a Microcontroller
D Single-Supply Operation Down to 2.7 V,
With Power-Down Feature
D Absolute Output Frequency Tolerance of
±5% (TSL230BR)
D Nonlinearity Error Typically 0.2% at 100 kHz
D Stable 150 ppm/°C Temperature Coefficient
D Replacements for TSL230, TSL230A, and
TSL230B
Description
The TSL230R, TSL230AR, and TSL230BR programmable light-to-frequency converters combine a
configurable silicon photodiode and a current-to-frequency converter on single monolithic CMOS integrated
circuits. The output can be either a pulse train or a square wave (50% duty cycle) with frequency directly
proportional to light intensity. Device sensitivity is selectable in three ranges, providing two decades of
adjustment. The full-scale output frequency can be scaled by one of four preset values. All inputs and the output
are TTL compatible, allowing direct two-way communication with a microcontroller for programming and output
interface. An output enable (OE) is provided that places the output in the high-impedance state for multiple-unit
sharing of a microcontroller input line.
The devices are available with absolute-output-frequency tolerances of
±5% (TSL230BR), ±10% (TSL230AR),
or
±20% (TSL230R). They have been temperature compensated for the ultraviolet-to-visible light range of
320 nm to 700 nm and respond over the light range of 320 nm to 1050 nm. The devices are characterized over
the temperature range of –25
°C to 70°C.
Functional Block Diagram
Light
Current-to-Frequency
Converter
Photodiode Array
S0
S1
S2
S3
OE
Output
t
t
Texas Advanced Optoelectronic Solutions Inc.
800 Jupiter Road, Suite 205
S Plano, TX 75074 S (972) 673-0759
2
3
4
8
7
6
5
S0
S1
OE
GND
S3
S2
OUT
VDD
PACKAGE P
8-LEAD PDIP
(TOP VIEW)
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