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AEDS-9300
Transmissive Photointerrupter
Data Sheet
Description
The photointerrupter consists of a Gallium Arsenide infrared light emitting diode and a NPN silicon phototransistor built in a black plastic housing. It is a transmissive subminiature photointerrupter.
Features
* * * * * * * * * * * Non-Contact Sensing Infra-Red Wavelength Fast Switching Speed Mounting Guide Pins RoHS Compliant -25 C to +85 C Operating Temp.
Input
VCC Output RL
Applications
Optical Switch ATM Machines Vending Machines Edge, Position Detections Office Automation Equipments
Figure 1: Illustrates Basic Configuration of Photointerrupter
Theory of Operation
The photo-interrupter consists of an Infrared light source and a photo-diode in a single Dual-in-Line package. The photo-interrupter could be mounted onto a PC board with a current-limiting resistor in series externally with the Infrared Emitting Diode. With this, such input voltage for the emitting diode could share the same voltage level as VCC. Regarding the photo-interrupter output, there will always be current output measured but with the external resistor, RL connected as shown in Figure1, analog voltage output could then be obtained.
Sensing Position Characteristics (Typical) X
Relative Light Current IL (%)
I F =20mA V CE =5V
With both the infrared light source and the photo diode in a single package, the photo-interrupter employs transmissive technology to sense obstacles existence, acts as on / off switchers or even to sense lowresolution rotary or linear motions. The photointerrupter is specified for operation over -25 C to +85 C temperature range. As a basic switcher, the photo-interrupter would have a position detecting characteristics as shown in Figure 2. These characteristic diagrams give the relationship between Relative Light Current, IL and Distance of displacement, d. Note that the slot (obstacle) introduced in between the emitting diode and the photo-diode could applied in two directions. One is of X-axis and another would be of Y-axis. Therefore, with the presence of slot, the photointerrupter would actually give a low logic output. Vice versa, the photo-interrupter will provide a high logic output without the existence of the slot. Refer to Figure 3. Typically, Rise Time, tr and Fall Time tf will have the same value, 15s. With special design of the slots, periodic presence and absence could be generated. Such output signal is useful in determining low-resolution (>0.5mm pitch) motor rotation positioning and motor spinning speed.
Y
I F =20mA V CE =5V Ta=25 o C Ta=25 o C
100
50
0 -3 -2 -1 0 1 2 3 -3 -2 -1 0 1 2 3
Input Output
tr
90 % 10 %
Distance d (mm)
t t tf
X-Direction
Figure 3: Response Time Measurement of Output Signal.
Output
-
0
+
Figure 4: Periodical Output signal could be used to determine the Motor Spinning Speed and Rotation positioning.
Y-Direction 0
+
Figure 2: Illustrates Photo-Interrupter Positioning Sensing Characteristics. Obstacles (Slots) could interrupt along X-axis or Y-axis
2
Absolute Maximum Ratings @ TA=25C
Parameter
Reverse voltage Forward current Forward surge current (10s pulse) Collector Emitter voltage Emitter Collector voltage Power dissipation Operation temperature range Storage temperature range Soldering temperature
Maximum Rating
5 50 1 30 5 175 -25C to 85C -40C to 85C 260C for 5 seconds
Unit
V mA A V V mW
Optical-Electrical Characteristics TA=25C
Parameter
Forward voltage Collector Current Collector Emitter voltage Emitter Collector voltage Collector dark current Collector Emitter saturation voltage Rising time Falling time
Symbol Min. Typ. Max. Unit Test Conditions
VF IC VCEO VECO ICEO VCE(SAT) Tr Tf 0.8 30 5 1.2 15 15 1.35 10 100 0.4 V mA V V nA V s s IF=20mA IF=20mA, Vce = 5V Ie=0.1mA, Ee=0mW/cm2 Ie=0.1mA, Ee=0mW/cm2 VCE=10V, Ee=0mW/cm2 Ie=0.5mA, Ee=0.1mW/cm2 VCE=5V, RL=1k, IC=1mA
3
Outline Drawing
Units in mm
4
Typical Optical-Electrical Curves
ICEO-Collector Dark Current-A
IC-Normalized Collector Current
1000 100 10 1 0.1 0.01 0.001 0 40 80 120 o TA - Ambient Temperature - C
4.0 Vce =5 V 3.5 2 Ee =0.1 mW/cm 3.0 @ l = 940 nm 2.5 2.0 1.5 1.0 0.5 0.0 -75
-25
25
75
o
125
T A - Ambient Temperature - C
Figure 6: Normalized Collector Current Vs Ambient Temperature
Figure 5: Collector Dark Current Vs Ambient Temperature
Tr Tf Rise and Fall Time - uS
200 160 120 80 40 0 0
Relative Collector Current
Vcc = 5 V V RL = 1 V F = 100 Hz PW = 1 ms
5 Vce = 5 V 4 3 2 1 0 0 1 2 3 4 5
2
2 4 6 8 R L - Load Resistance - K
10
6
Ee - Irradiance - mW/cm
Figure 7: Rise and Fall Times Vs Load Resistance
Figure 8: Relative Collector Current Vs Irradiance
100
Forward Current (mA)
80 60 40 20 0
0
1.2
1.6 2.0 2.4 Forward Voltage (V)
2.8
Figure 9: Forward Current Vs Forward Voltage
5
For product information and a complete list of distributors, please go to our web site:
www.avagotech.com
Avago, Avago Technologies, and the A logo are trademarks of Avago Technologies, Limited in the United States and other countries. Data subject to change. Copyright (c) 2006 Avago Technologies Pte. All rights reserved. AV01-0363EN - August 21, 2006

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