optical reflective sensor technical data features ? focused emitter and detector in a single package ? to5 package ? binning of sensors by photocurrent (ipr) HEDS-1300 precision resolution sensor description the HEDS-1300 sensor is fully integrated modules designed for applications requiring optical reflective sensing. the module contains an led emitter (at the appropriate wavelengths) 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 that defines the reso- lution of the sensor. the output signal is a current generated by the photodiode. selection guide sensor part number HEDS-1300 resolution 0.19 mm (0.0075 in.) led wavelength 700 nm applications ? bar code scanning ? pattern recognition and verification ? object sizing ? optical limit switching ? optical/surface inspection ? tachometry ? edge/line sensing ? dimensional monitoring package dimensions c l 5.08
(0.200) reference plane maximum signal point ?msp 4.27 ?0.25
(0.168 ?0.010) 5.08
(0.200) 9.40 (0.370)
8.51 (0.335) 0.86 (0.034)
0.73 (0.029) 1.14 (0.045)
0.73 (0.029) 15.24 (0.600)
12.70 (0.500) 11.50 (0.453)
11.22 (0.442) 8.33 (0.328)
8.12 (0.320) 12.0
(0.473) s.p. r.p. 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.
7. o.d. = outside diameter of can measured in region above weld flange to midway of can length. z o.d.
2 HEDS-1300 optical system mechanical considerations the HEDS-1300 sensors is packaged in a high profile 8 pin to5 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 bifurcated aspheric acrylic lens that focuses them to the same point. the sensors can be rigidly secured by commercially available to5 style heat sinks, or 8 pin 0.200 inch diameter pin circle sockets. these fixtures provide a stable reference platform for affixing the sensors to a circuit board. in applications requiring contact scanning, protective focusing tips are available. focusing tips are available in either metal (hbcs- 2999 or hbcs-4999) or polycarbonate (hbcs-a998 or hbcs-a999) packages using a rugged sapphire ball as the contact surface. electrical operations the detector of the sensor is a single photodiode. the cathode of the emitter is physically and elec- trically connected to the case- substrate of the device. applications that require modula- tion or switching of the led should be designed to have the cathode connected to the electri- cal ground of the system. refer to the schematic and connection diagrams that follow. 7 35 26 4 top view pin # function (HEDS-1300) 2
3
4
6 photodiode anode
photodiode cathode
led cathode, substrate, case
led anode reference
plane reflector 6 *no connection to be made to pin 1 and pin 8 4 d s 2 led z d p d s led schematic diagram connection diagram 3 d s transistor
not specified 1* 8* 1* 8*
3 absolute maximum ratings @ t a = 25 parameter symbol heds- min. max. units fig. notes storage temperature ts 1300 -40 +75 c operating temperature t a 1300 -20 +70 c lead soldering temperature 1300 260 c1 1.6 mm from seating plane for 10 sec. average led forward if 1300 50 ma 2 current peak led forward current ifpk 1300 75 ma 7 3 reverse led input voltage vr 1300 5.0 v photodiode bias vd 1300 -0.3 20 v 4 (id = 100 m a max) system electrical/optical characteristics @ t a = 25 c parameter symbol heds- min. typ. max. units conditions fig. notes reflected ipr 1300 150 280 650 na if = 35 ma, vd = 0 1, 2, 6 photocurrent see binning table quality factor 1300 0.82 0.95 1.0 if = 35 ma 1 5, 6 ipr temperature ke 1300 -0.01 1/ c if = 35 ma 7 coefficient system optical step d 1300 0.19 mm 9 8 response size (osr) maximum signal zm 1300 4.01 4.27 4.52 mm measured from 4 point (msp) reference plane effective numerical n.a. 1300 0.3 aperture of detector lens notes: 5. measured from a reflector coated with 99% diffuse reflective white paint (kodak 6080) positioned 4.27 mm (0.168 in.) from the sensors reference plane. measured physically is the total photocurrent, ipt, which consists of a signal (reflected from target) component, ipr, and a component induced by reflections internal to the sensor (stray), ips. ipr = ipt - ips. 6. = ipr/ipt 7. photocurrent variation with temperature follows a natural exponential law: ip(t) = ip(to)*exp[ke(t-to)] 8. osr size is defined as the distance for the 10%-90% step response of ipr as the sensor moves over an abrupt black-white edge, or from opaque white to free space (no reflection). notes: 1. caution: the thermal constraints of the acrylic lens will not permit the use of conventional wave soldering procedures. the typical preheat and post-cleaning temperatures and dwell times can subject the lens to thermal stresses beyond the absolute maximum ratings and can cause it to defocus. 2. derate maximum average current linearly from 65 c by 6 ma/ c [HEDS-1300 only]. 3. 1 khz pulse rate, 300 ms pulse width. 4. all voltages referenced to pin 4.
4 emitter electrical/optical characteristics @ t a = 25 c parameter symbol heds- min. typ. max. units conditions fig. notes forward voltage vf 1300 1.6 1.8 v if = 35 ma 3 reverse break- bvr 1300 5.0 v ir = 100 m a down voltage thermal co- d vf/ d t 1300 -1.2 mv/ c if = 35 ma efficient of vf peak l 1300 680 700 720 nm if = 35 ma 5 wavelength emitting area ae 1300 0.0285 sq-cm 0.185 mm diameter junction (0.0073 in.) detector electrical/optical characteristics @ t a = 25 c parameter symbol heds- min. typ. max. units conditions fig. notes dark current id 1300 50 1000 pa vd = 5 v, if = 0 reflection = 0% capacitance cd 1300 100 pf vd = 0 v, if = 0 f = 1 mhz detector area ad 1300 0.16 sq-mm square, with length = 0.4 mm per side product marking the photocurrent binning of the sensor is included in the 8-digit code printed on the sensor can. the last digit in the code repre- sents the bin number. see figure 8 for suggestions 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 tempera- ture changes. (ambient temper- ature affects led efficiency slightly and may cause several percent changes in ipr). bin numbers are for reference only and do not constitute an absolute guarantee. the output of all leds degrades 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. bin table ipr limits (na) bin # min. max. 2 150 200 3 195 245 4 240 293 5 288 355 6 350 430 7 425 520 8 515 650
5 figure 1. HEDS-1300 photocurrent test circuit. HEDS-1300 optical system reference
plane reflector 6 substrate, case 4 d p led z + v f i pt na-meter i f = 35 ma d s 2 3 d s i pt = i pr + i ps
i ps : measured in the dark
i pr : with z = 4.27 mm na-meter: keithley model 480
(or equivalent) 1 8 detector
0.406 mm square baffle glass sensing
area emitter
0.185 mm dia. junction epoxy
seal lens
6 figure 2. relative reflected photocurrent. figure 3. led forward voltage vs. forward current. figure 4. photocurrent variation with distance. figure 5. typical spectral distribution of leds. figure 6. relative spectral response of HEDS-1300 sensor. figure 8. sensor with transimpedance amplifier. figure 7. sensor pulse drive considerations. max tolerable peak pulse current vs. pulse duration. response @ given wavelength
normalized to peak 1.0 wavelength ?nm 0 600 900 0.2 700 0.4 0.6 0.8 800 low-pass filtering
of ambient light
caused by red lens typ. peak
responsivity
re = 0.34 amp/watt reference
plane reflector 6 case, substrate 4 d s d p 3 2 led z i f i pt + v o r f +5 v sensor
bin number recommended value
or r f (ohms) 2
3
4
5
6
7
8 15 m
12 m
10 m
8.2 m
6.8 m
5.6 m
4.7 m note: for v o (approx.) 1.9 ?2.4 volts v o = r f x | i pt | photocurrent normalized
at i f = 35 ma, t a = 25 ? 1.5 i f ?led forward current ?ma 0.7 15 0 050 1.1 0.1 5253540 0.2 0.3 0.4 0.8 1.0 1.2 1.3 10 20 30 45 0.5 0.6 0.9 1.4 v f ?forward voltage ?v 1.8 i f ?forward current (log scale) 1.3 0.8 1 ? 100 ma 1.5 0.9 10 ma 1.0 1.7 10 ? 100 ? 1 ma 1.2 1.4 1.6 1.1 percent msp signal distance from reference plane
of sensor ?mm 40 3.5 0 2.5 5.5 100 20 3.0 4.0 4.5 5.0 80 60 light output (normalized to 25 ? value) 1.4 wavelength ?nm 0 600 920 760 0.2 640 680 720 0.6 1.0 1.2 800 840 880 0.8 0.4 70 ? 25 ? 0 ? ratio of maximum operating peak
current to temperature derated
maximum dc current t p ?pulse duration (?) 1.4 10 1.0 1 10,000 1.2 100 1000 1.6 1.8 p k (max.) f (max.) 10 khz 3 khz 1 khz 300 hz 100 hz 30 khz 1.1 1.3 1.5 1.7 1.9
7 preferred orientation at maximum signal point (msp) and/or when the sensor is in focus, the orientation of the sensor is unimportant. however, as one moves away from msp and/or moves out of focus (either by distance or angle), the pre- ferred orientation indicated above is recommended to maintain a higher resolution spot size. figure 9. HEDS-1300, system optical step response variation with distance. d ?system response ?mm 1.0 distance from sensor ?mm 0 2.5 4.0 0.2 3.0 0.4 0.6 0.8 3.5 preferred orientation non-preferred
orientation d white black 100 % 90 % 10 % 0 4.5 5.0 6.0 5.5
warranty and service agilent optical reflective sensor is warranted for a period of one year after purchase covering defects in material and workman- ship. 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 sales representative or authorized distributor. www.semiconductor.agilent.com data subject to change. copyright ? 2001 agilent technologies, inc. october 29, 2001 obsoletes 5966-1624e (11/99) 5988-4570en
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