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655 nm Precision Optical Reflective Sensor Technical Data
HEDS-1500
Features
* Focused Emitter and Detector in a Single Package * 655 nm Visible Emitter * 0.178 mm (0.007) Resolution * TO-5 Miniature Sealed Package * Photodiode Output
emitter and a matched I.C. photodetector. A bifurcated aspheric lens is used to image the active areas of the emitter and the detector to a single spot 4.27 mm (0.168 in.) in front of the package. The output signal is a current generated by the photodiode.
Applications
Applications for the HEDS-1500 include bar code scanning, pattern recognition and verification, object sizing, optical limit switching, tachometry, textile thread counting and defect detection, dimensional monitoring, line locating, paper edge detection, and any application where precision optical reflective sensing is desired.
Mechanical Considerations
The HEDS-1500 is packaged in a high profile 8 pin TO-5 metal can with a glass window. The emitter and photodetector chips are mounted on the header at the base of the package. Positioned above these active elements is a
Description
The HEDS-1500 is a fully integrated module designed for applications requiring optical reflective sensing. The module contains a 655 nm visible LED
Package Dimensions
MAXIMUM SIGNAL POINT 9.40 (0.370) 8.51 (0.335) 5.08 (0.200) 0.86 (0.034) 0.73 (0.029) C L REFERENCE PLANE 5.08 (0.200) 4.27 0.25 (0.168 0.010) 4.11 (0.162) 1.14 (0.045) 0.73 (0.029) 15.24 (0.600) 12.70 (0.500) S.P. 12.0 (0.473) R.P.
8.33 (0.328) 7.79 (0.307)
11.50 (0.453) 11.22 (0.442)
NOTES: 1. ALL DIMENSIONS IN MILLIMETERS AND (INCHES). 2. ALL UNTOLERANCED DIMENSIONS ARE FOR REFERENCE ONLY. 3. THE REFERENCE PLANE (R.P.) IS THE TOP SURFACE OF THE PACKAGE. 4. NICKEL CAN AND GOLD PLATED LEADS. 5. S.P. = SEATING PLANE. 6. THE LEAD DIAMETER IS 0.45 mm (0.018 IN.) TYP.
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bifurcated aspheric acrylic lens that focuses them to the same point. The sensors can be rigidly secured by commercially available two piece TO-5 style heat sinks, such as Thermalloy 2205, Aavid Engineering 321527, or 8 pin 0.200 inch diameter pin circle sockets. These fixtures provide a stable reference platform for affixing the HEDS-1500 to a circuit board. In applications requiring contact scanning, protective focusing tips are available. Focusing tips are
SCHEMATIC DIAGRAM
available in either metal or polycarbonate packages using a sapphire ball as the contact surface. The Agilent part numbers are HEDS-3001, HBCS-2999, HBCS-4999, HBCS-A998, and HBCS-A999.
Applications that require modulation or switching of the LED should be designed to have the cathode connected to the electrical ground of the system. Applications where ambient light is present will require a special LED drive and recovery circuit to achieve the full resolution of the sensor. Application Note 1040 provides data and schematics to support HEDS-1500 sensor operation in ambient light conditions. A reliability data sheet is available for the HEDS-1500 precision optical reflective sensor.
Electrical Operation
The detector of the sensor is a single photodiode. Figure 7 shows photocurrent being supplied from the cathode of the photodiode to an inverting input of the operational amplifier. The cathode of the 655 nm emitter is physically and electrically connected to the case-substrate of the device.
CONNECTION DIAGRAM
REFLECTOR PIN # REFERENCE PLANE Z 1 DPS RS LED 3 2 RS 4 CASE, SUBSTRATE RS - CHARACTERISTIC NOT DEFINED 8 4 TOP VIEW 5 8 7 1 2 4 6 8 6 FUNCTION PHOTODIODE CATHODE HEADER GROUND ** LED ANODE PHOTODIODE ANODE
2 6 LED DPS 1
**CUSTOMER SHOULD NOT CONNECT GROUND TO PIN 4. INTERNAL CONNECTION TO PIN 4 WILL BE DELETED IN THE FUTURE.
Absolute Maximum Ratings @ TA = 25C
Parameter Operating Temperature Storage Temperature Lead Soldering Temperature Average LED Forward Current Peak LED Forward Current Reverse LED Input Voltage Photodiode Bias (-V = forward bias)
(See next page for Notes.)
Symbol TA TS
Min. -20 -40
Max. 70 75 260 for 10 sec.
Units C C C mA
Note
1
If Ifp Vr Vd -0.3
50 (data pending) 5 7
2 V V 3
3
Electrical/Optical Characteristics at TA = 25C
Parameter Reflected Photocurrent Quality Factor Maximum Signal Point (MSP) LED Forward Voltage LED Reverse Breakdown Voltage Photodiode Dark Current LED Peak Wavelength Ipr Temperature Coefficient System Optical Step Response Size (OSR) Symbol Ipr Z Vf BVR Id lambda Ke d Min. 80 0.82 Typ. 125 0.95 Max. - 1.0 Units nA - Conditions If = 35 mA If = 35 mA Note 4, 5, 11 4, 6 4, 7 If = 35 mA Ir = 100 A V d = 5 V, If = 0 If = 35 mA 9 - 10 8 8 5 4 3 Figure 1, 2, 4, 7
4.01 4.27 4.52 mm (0.158) (0.168) (0.178) (inch) - 5.0 - 1.72 - 50 655 -0.006 0.154 (0.006) 1.86 - 1000 670 V V pA nm 1/C mm (inch)
Notes: 1. CAUTION: The thermal constraints of the acrylic lens will not permit conventional wave soldering procedures. The typical preheat and post-soldering cleaning procedures and dwell times can subject the lens to thermal stresses beyond the absolute maximum ratings and can cause it to defocus. 2. (Reliability tests are proceeding--data not yet available.) 3. Id (max) = 100 A. Recommended operation: Vd (min) = 0 V Vd (max) = 5 V Exceeding maximum conditions may cause permanent damage to photodiode or to chip metallization. 4. Measured from a reflector coated with 99% diffuse reflective white paint (Kodak 6080) positioned 4.27 mm (0.168 in.) from the reference plane. (See "Photocurrent Test Circuit" for test connection.) Measured physically is the total photocurrent, Ipt, which consists of a signal (reflected from target) component, Ipr, and a component induced by reflection internal to the sensor (stray), Ips . Ipt = Ipr + Ips Specified is the reflected signal component, Ipr. 5. See Bin Table. 6. = Ipr/Ipt. 7. Measured from the reference plane (R.P.) of the sensor. 8. Leakage current of photodiode measured in the dark. 9. Photocurrent variation with temperature varies with LED output which follows a natural exponential law: Ip(T) = Ip(To)*exp[Ke(T-To)]. 10. OSR size is defined as the distance for a 10%-90% "step" response of Ipr as the sensor moves over an abrupt step from opaque white to black, or from opaque white to free space (no reflection). 11. Sensor contains no ambient light filtering--see Figure 6 for relative response of detector. In bright ambient light conditions, LED signal may be a small portion of total signal. AC coupling and additional signal processing may be necessary. Reference Application Note 1040.
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BIN TABLE Ipr LIMITS BIN # 1 2 3 4 5 6 7 MIN. 80 105 125 150 180 215 270 MAX. 110 nA 135 155 190 220 275 320
Product Marking
The photocurrent binning of the sensor is incorporated as part of the date code format, assigned at time of test--"CTYYWWan", where: C = letter identifying country of assembly--S = Singapore If blank = USA T = tester code designation letter (single letter) YY = last two digits of year WW = week number in year a = single lot code letter (A - Z), sequential assignment during week n = bin number See Figure 7 for suggestion in the application of photocurrent bins. Test algorithm bins units to the lowest bin number if a unit is in the overlap region. Such units can cross bin boundaries as temperature changes. (Ambient temperature affects LED efficiency slightly and may cause several percent change in Ipr). Bin numbers are for "reference only" and do not constitute an absolute guarantee. The output of all LEDs degrade with time, depending on drive conditions and temperature. The entire available distribution of parts, appropriately marked, will be shipped. Single bin orders cannot be supplied.
OPTICAL SYSTEM
EMITTER 0.185 mm DIA. JUNCTION BAFFLE
ACRYLIC SEAL
SENSING AREA
GLASS
DETECTOR 0.406 mm SQUARE
LENS
REFLECTOR REFERENCE PLANE Z
+Vf 6 LED If 2 RS 4 CASE, SUBSTRATE DPS 8 1
IPT nA-METER
Figure 1. Photocurrent Test Circuit.
5
3.0
PHOTOCURRENT NORMALIZED AT IF = 35 mA, 25 C
2.0
VF - FORWARD VOLTAGE - V
1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 1.1 1.0 1 A 10 A 100 A 1 mA 10 mA 100 mA IF - FORWARD CURRENT
2.5 2.0 1.5 1.0 0.5 0
0 10 20 30 40 50 60 70 80 90 100 IF - FORWARD CURRENT - mA
Figure 2. Relative Reflected Photocurrent.
Figure 3. LED Forward Voltage vs. Forward Current.
SENSOR MSP RANGE
PHOTOCURRENT NORMALIZED TO PEAK @ MSP
1.75
LED LIGHT OUTPUT (NORMALIZED TO 25 C VALUE)
1.0 MSP = 4.01 mm 0.8
1.50 1.25 1.00 0.75 0.50 0.25 0 595 615 635 655
-20 C NORMALIZED 0 C NORMALIZED 25 C NORMALIZED 70 C NORMALIZED
0.6
0.4
0.2 MSP = 4.52 mm 0 3.0 3.5 4.0 4.5 5.0 5.5 6.0
675
695
715
WAVELENGTH - nm
DISTANCE FROM REFERENCE PLANE OF SENSOR - mm
Figure 4. Photocurrent Variation with Distance.
Figure 5. 655 nm Emitter Typical Spectral Distribution.
RESPONSE NORMALIZED TO PEAK
1.0
0.8
0.6
0.4
0.2
0 550 600 650 700 750 800 850 900 WAVELENGTH - nm
Figure 6. Relative Spectral Response of Sensor.
REFLECTOR C1 REFERENCE PLANE Z
Rf +5 V If IPT 6 LED 4 RS 2 CASE, SUBSTRATE R2 C1 - LIMITS BANDWIDTH OF PRE-AMP. C2 - AC-COUPLING MAY BE NECESSARY IN HIGH LIGHT AMBIENT CONDITIONS. Rf - FOR OPTIMUM PERFORMANCE, Rf SHOULD BE SELECTED TO MATCH BIN NUMBER OF SENSORS SO AS TO MAINTAIN VO IN DESIRED RANGE. DPS 1 8 + R1 - VO = [(R1 + R2)/R2] x Rf x IPT VO C2
Figure 7. Sensor with Transimpedance Amplifier.
NORMALIZED SIGNAL
1.0
d - SYSTEM RESPONSE - mm
100 % WHITE 90 % d 10 % 0
0.8
CUSP PERPENDICULAR TO EDGE OF STEP
0.6
BLACK
0.4
0.2 LENS CUSP PARALLEL TO EDGE OF STEP 3.1 3.5 3.9 4.3 4.7 5.1 5.5 5.9
0 2.7
DISTANCE FROM REFERENCE PLANE OF SENSOR - mm
Figure 8. System Optical Step Response Variation with Distance.
Warranty and Service
Agilent Optical Reflective Sensor is warranted for a period of one year after purchase covering defects in material and workmanship. Agilent will repair or, at its option, replace products that prove to be defective in material or workmanship under proper use during the warranty period. NO OTHER WARRANTIES ARE EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. AGILENT IS NOT LIABLE FOR CONSEQUENTIAL DAMAGES. For additional warranty or service information please contact your local Agilent sales representative or authorized distributor.
www.semiconductor.agilent.com Data subject to change. Copyright (c) 1999 Agilent Technologies Obsoletes 5952-2227E 5091-7285E (11/99)

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