two channel optical incremental encoder modules technical data features ? high performance ? high resolution ? low cost ? easy to mount ? no signal adjustment required ? small size ? -40 c to 100 c operating temperature ? two channel quadrature output ? ttl compatible ? single 5 v supply description the heds-9000 and the heds- 9100 series are high performance, low cost, optical incremental encoder modules. when used with a codewheel, these modules detect rotary position. the modules consist of a lensed (led) source and a detector ic enclosed in a small c-shaped plastic package. due to a highly col- limated light source and unique photodetector array, these modules are extremely tolerant to mounting misalignment. the two channel digital outputs and the single 5 v supply input are accessed through five 0.025 inch square pins located on 0.1 inch centers. standard resolutions for the heds-9000 are 500 cpr and 1000 cpr for use with a heds- 6100 codewheel or equivalent. esd warning: normal handling precautions should be taken to avoid static discharge. heds-9000 HEDS-9100 package dimensions 26.67 (1.05) heds-9x00 15.2
(0.60) c l 17.27
(0.680) 20.96
(0.825) 1.85 (0.073) 8.64 (0.340)
ref. aligning recess
2.44/2.41 dia.
(0.096/0.095)
2.16 (0.085)
deep 1.02 ?0.10
(0.040 ?0.004) 5.1 (0.20) x00 yyxx option code 0.63 (0.025)
sqr. typ. 2.54 (0.100) typ. date code 1.0 (0.04) 3.73 ?0.05
(0.147 ?0.002) 2.67 (0.105) dia.
mounting thru
hole 2 places 2.44/2.41 x 2.79
(0.096/0.095 x 0.110)
2.16 (0.085) deep optical center 1.52 (0.060) 20.8
(0.82) 11.7
(0.46) 8.6 (0.34) 1.78 ?0.10
(0.070 ?0.004) 2.92 ?0.10
(0.115 ?0.004) 10.16
(0.400) 5.46 ?0.10
(0.215 ?0.004) optical
center line 2.54
(0.100) 2.21
(0.087) 5.8
(0.23) 6.35 (0.250) ref. aligning recess
2.44/2.41 x 2.79
(0.096/0.095 x 0.110)
2.16 (0.085) deep 4.11 (0.162) aligning recess
2.44/2.41 dia.
(0.096/0.095)
2.16 (0.085) deep optical
center 45 8.81
(0.347) 11.9
(0.47) 4.75 ?0.10
(0.187 ?0.004) 2.9
(0.11) 1.8
(0.07) 6.9 (0.27) v cc gnd 5 ch. b 4 v cc 3 ch. a 2 n.c. 1 gnd side a side b typical dimensions in
millimeters and (inches)
2 for the HEDS-9100, standard resolutions between 96 cpr and 512 cpr are available for use with a heds-5120 codewheel or equivalent. applications the heds-9000 and 9100 provide sophisticated motion detection at a low cost, making them ideal for high volume applications. typical applications include printers, plotters, tape drives, and factory automation equipment. note: agilent technologies encoders are not recommended for use in safety critical applications. eg. abs braking systems, power steering, life support systems and critical care medical equipment. please contact sales representative if more clarification is needed. theory of operation the heds-9000 and 9100 are c- shaped emitter/detector modules. coupled with a codewheel, they translate the rotary motion of a shaft into a two-channel digital output. as seen in the block diagram, each module contains a single light emitting diode (led) as its light source. the light is collimated into a parallel beam by means of a single polycarbonate lens located directly over the led. opposite the emitter is the integrated detector circuit. this ic consists of multiple sets of photodetectors and the signal processing circuitry necessary to product the digital waveforms. the codewheel rotates between the emitter and detector, causing the light beam to be interrupted block diagram by the pattern of spaces and bars on the codewheel. the photodiodes which detect these interruptions are arranged in a pattern that corresponds to the radius and design of the ode- wheel. these detectors are also spaced such that a light period on one pair of detectors corresponds to a dark period on the adjacent pair of detectors. the photodiode outputs are then fed through the signal processing circuitry resulting in a, a, b, and b. two comparators receive these signals and produce the final outputs for channels a and b. due to this integrated phasing technique, the digital output of channel a is in quadrature with that of channel b (90 degrees out of phase). output waveforms
3 absolute maximum ratings storage temperature, t s ..................................................................... -40 c to 100 c operating temperature, t a ................................................................ -40 c to 100 c supply voltage, v cc ...................................................................................... -0.5 v to 7 v output voltage, v o ........................................................................................ -0.5 v to v cc output current per channel, i out ................................................. -1.0 ma to 5 ma definitions count (n): the number of bar and window pairs or counts per revolution (cpr) of the codewheel. 1 shaft rotation = 360 mechanical degrees, = n cycles. 1 cycle (c) = 360 electrical degrees ( e), = 1 bar and window pair. pulse width (p): the number of electrical degrees that an output is high during 1 cycle. this value is nominally 180 e or 1/2 cycle. pulse width error ( d p): the deviation, in electrical degrees of the pulse width from its ideal value of 180 e. state width (s): the number of electrical degrees between a transition in the output of channel a and the neighboring transition in the output of channel b. there are 4 states per cycle, each nominally 90 e. state width error ( d s): the deviation, in electrical degrees, of each state width from its ideal value of 90 e. phase ( f ): the number of elec- trical degrees between the center of the high state of channel a and the center of the high state of channel b. this value is nominally 90 e for quadrature output. phase error ( df ): the deviation of the phase from its ideal value of 90 e. direction of rotation: when the codewheel rotates in the direction of the arrow on top of the module, channel a will lead channel b. if the codewheel rotates in the opposite direction, channel b will lead channel a. optical radius (r op ): the dis- tance from the codewheels center of rotation to the optical center (o.c.) of the encoder module. recommended operating conditions parameter symbol min. typ. max. units notes temperature t -40 100 c supply voltage v cc 4.5 5.5 volts ripple < 100 mv p-p load capacitance c l 100 pf 3.3 k w pull-up resistor count frequency f 100 khz velocity (rpm) x n 60 note: the module performance is guaranteed to 100 khz but can operate at higher frequencies. encoding characteristics encoding characteristics over recommended operating range and recommended mounting tolerances. these characteristics do not include codewheel/codestrip contribution. description sym. typ. case 1 max. case 2 max. units notes pulse width error d p30 40 e logic state width error d s30 40 e phase error df 2 10 105 e case 1: module mounted on tolerance circle of 0.13 mm ( 0.005 in.). case 2: heds-9000 mounted on tolerances of 0.50 mm (0.020"). HEDS-9100 mounted ontolerances of 0.38 mm (0.015").
4 electrical characteristics electrical characteristics over recommended operating range, typical at 25 c. parameter symbol min. typical max. units notes supply current i cc 17 40 ma high level output voltage v oh 2.4 volts i oh = -40 m a max. low level output voltage v ol 0.4 volts i ol = 3.2 ma rise time t r 200 ns c l = 25 pf fall time t f 50 ns r l = 11 k w pull-up derating curves over extended operating frequencies (heds-9000/9100) below are the derating curves for state, duty, phase and v oh over extended operating frequencies of up to 240 khz (recommended maximum frequency is 100 khz). the curves were derived using standard ttl load. C40 c operation is not feasible above 160 khz because v oh will drop below 2.4 v (the minmum ttl for logic state high) beyond that frequency. 120 220 frequency (khz) -40 0 change in pulse width error
(electrical degree) 240 -30 -20 160 -10 140 200 180 100? 25? -40? -50 120 220 frequency (khz) 10 50 change in state width error
(electrical degree) 240 20 30 160 40 140 200 180 100? 25? -40? 0 120 220 frequency (khz) -10 0 change in phase error
(electrical degree) 240 -5 160 140 200 180 100? 25? -40? 120 220 frequency (khz) 3 5 change in v oh (volts) 240 4 160 140 200 180 100? 25? -40? 2 1 0
5 recommended codewheel characteristics figure 1. codestrip design codewheel options optical heds cpr radius series (n) option mm (in.) 5120 96 k 11.00 (0.433) 5120 100 c 11.00 (0.433) 5120 192 d 11.00 (0.433) 5120 200 e 11.00 (0.433) 5120 256 f 11.00 (0.433) 5120 360 g 11.00 (0.433) 5120 400 h 11.00 (0.433) 5120 500 a 11.00 (0.433) 5120 512 i 11.00 (0.433) 6100 500 a 23.36 (0.920) 6100 1000 b 23.36 (0.920) parameter symbol minimum maximum units notes window/bar ratio f w / f b 0.7 1.4 window length l w 1.8 (0.071) 2.3 (0.09) mm (inch) absolute maximum r c r op + 1.9 (0.0075) mm (inch) includes eccentricity codewheel radius errors
6 mounting considerations figure 2. mounting plane side a. figure 3. mounting plane side b. figure 4. mounting as referenced to side a. figure 5. mounting as referenced to side b.
7 01 02 03 04 05 06 08 09 10 11 12 13 14 heds-6100 a * * * b **** mounting manufacturer part number surface amp 1203686-4 both 640442-5 side b dupont 65039-032 with both 4825x-000 term. hp heds-8902 side b with 4-wire leads (see fig. 6) molex 2695 series with side b 2759 series term. figure 6. heds-8902 connector. connectors abcdefgh i jklstu heds-9000 * * * * * heds-9000 option heds-6100 option 0 0 ordering information resolution (cycles/rev) a - 500 cpr b - 1000 cpr j - 1024 cpr t - 2000 cpr* u - 2048 cpr* shaft diameter 06 - 1/4 in. 10 - 5/8 in. 08 - 3/8 in. 12 - 6 mm 09 - 1/2 in. 13 - 8 mm
01 02 03 04 05 06 08 09 10 11 12 13 14 heds-5120 a ****** ** * c * * **** d* e** f* g** ** * * h***** i*** *** k* * heds-910 0 option heds-5120 option 0 0 shaft diameter 01 - 2 mm 11 - 4 mm 02 - 3 mm 14 - 5 mm 03 - 1/8 in. 12 - 6 mm 04 - 5/32 in. 13 - 8 mm 05 - 3/16 in. 06 - 1/4 in. resolution (cycles/rev) s - 50 cpr k - 96 cpr c - 100 cpr e - 200 cpr f - 256 cpr g - 360 cpr h - 400 cpr a - 500 cpr i - 512 cpr b - 1000 cpr* j - 1024 cpr* lead 0 - straight leads 1 - bent leads abcdefgh i jkstu HEDS-9100 * * * ******** heds-9101 **** www.agilent.com/semiconductors for product information and a complete list of distributors, please go to our web site. for technical assistance call: americas/canada: +1 (800) 235-0312 or (408) 654-8675 europe: +49 (0) 6441 92460 china: 10800 650 0017 hong kong: (+65) 6271 2451 india, australia, new zealand: (+65) 6271 2394 japan: (+81 3) 3335-8152(domestic/interna- tional), or 0120-61-1280(domestic only) korea: (+65) 6271 2194 malaysia, singapore: (+65) 6271 2054 taiwan: (+65) 6271 2654 data subject to change. copyright ? 2002 agilent technologies, inc. obsoletes 5988-5857en may 8, 2002 5988-6712en
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