TAOS TSLM5660, TSLM5880, TSLM5620, TSLM5550, TSLM5585 Datasheet

TSLM5470, TSLM5550, TSLM5620, TSLM5660, TSLM5880

CHEMICALOPTICAL SENSOR PLATFORM FAMILY

SOES033 – OCTOBER 1997

1

www.taosinc.com

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Copyright  2000, TAOS Inc.

 Fully Integrated Sensor Includes LED and

Photodetectors

 EOC230 Light-to-Frequency Converter

Photodetectors Provide Outstanding
Linearity

 Programming Pins Enable Very High

Dynamic Range

 Operates Down to 3.3 V
 Reference Channel for Ambient Noise

Cancellation

 Molded Plastic Lid With Optical Features

Facilitates System Alignment

 Excellent for Calorimetric and Absorption

and Refractive Index Measurements

 Various LED Wavelengths Available

Description

Each of these chemical-optical sensor platforms consists of two EOC230 light-to-frequency converter detectors
and a single high-efficiency light-emitting diode mounted on a glass/epoxy substrate and encapsulated in an
injection-molded plastic lid with integral optical features.

Light from the LED is projected into waveguides (attached separately) by means of the molded optics in the
center of the sensor lid. Light passing through the waveguides is directed onto the detectors by means of molded
optics at each end of the sensor lid. The light impinging upon the detector surface will be affected by changes
in the chemistry deposited on the sense waveguides. Neither the waveguides nor the chemistry on the sense
waveguides is included with the sensor platform. Two EOC230 light-to-frequency converter detectors are
incorporated to provide a sense channel and a reference channel.

The detector outputs are pulses, the frequencies of which correspond linearly with the amount of light impinging
upon the detector surface. Sensitivity for each detector can be programmed for 1x, 10x, or 100x via logic signals
applied to control pins S0 and S2 as shown in Table 1. Output frequency of each detector can be scaled to divide
by 2, 10, or 100 via logic signals applied to control pins S2 and S3 (Table 1). The TSLM5xxx family of devices
offers light-emitting diodes of various wavelengths to match specific chemistries and applications.

These chemical-optical sensor platforms are well suited for a wide variety of applications, including sensors for
hydrocarbon, carbon monoxide, and oxygen detection, industrial hygiene, home safety, and chemistry
development.

Table 1. Control Pin Functions

S1 S0 SENSITIVITY S3 S2 FOUT SCALING

0 0 Power down 0 0 ÷1
0 1 1x 0 1 ÷2
1 0 10x 1 0 ÷10
1 1 100x 1 1 ÷100

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Texas Advanced Optoelectronic Solutions Inc.

800 Jupiter Road, Suite 205  Plano, TX 75074  [phone]

TSLM5xxx PACKAGE

(TOP VIEW)

20
19
18
17

14
13
12
11

1
2
3
4

7
8
9
10

S2 S
S3 S
S0 S
S1 S

V

DD

S
FOUT S
GND S
LED A

LED C

GND R

FOUT R

V

DD

R

S1 R
S0 R
S3 R
S2 R

TSLM5470, TSLM5550, TSLM5620, TSLM5660, TSLM5880
CHEMICALOPTICAL SENSOR PLATFORM FAMILY

SOES033 – OCTOBER 1997

2

www.taosinc.com





Copyright  2000, TAOS Inc.

Terminal Functions

TERMINAL

NAME NO.

I/O

DESCRIPTION

S2 2 1 I Sense channel
S3 S 2 I Sense channel
S0 S 3 I Sense channel
S1 S 4 I Sense channel

X

X
LED C 7 LED cathode
GND R 8 Ground reference channel
FOUT R 9 O Reference channel FOUT
VDD R 10 Supply voltage reference channel
S2 R 11 I Reference channel
S3 R 12 I Reference channel
S0 R 13 I Reference channel
S1 R 14 I Reference channel

X

X
LED A 17 LED anode
GND S 18 Ground sense channel
FOUT S 19 O Sense channel
VDD S 20 Supply voltage sense channel

Absolute Maximum Ratings, TA = 25°C (unless otherwise noted)

†

Supply voltage range, VDD 0 V to 6.5 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Input voltage range, VI, all inputs –0.3 V to VDD + 0.3 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Average LED current, dc 50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Peak pulsed LED current, ≤ 2-µs pulse width, ≤ 10% duty cycle 500 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating temperature range, T

A

0°C to 70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–20°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1, 6 mm (1/16 inch), from seating plane 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

Recommended Operating Conditions

MIN MAX UNIT

Supply voltage, V

DD

4.75 5.25 V

TSLM5585, TSLM5660, TSLM5880 5 20

LED forward current, I

F

TSLM5470, TSLM5550, TSLM5620 20 50

mA

Operating temperature Case-to-ambient thermal resistance ≤ 50°C/W 0 70 °C