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2-90 h quick assembly two and three channel optical encoders technical data esd warning: normal handling precautions should be taken to avoid static discharge. features ? two channel quadrature output with optional index pulse ? quick and easy assembly ? no signal adjustment required ? external mounting ears available ? low cost ? resolutions up to 1024 counts per revolution ? small size ? -40 c to 100 c operating temperature ? ttl compatible ? single 5 v supply description the heds-5500/5540, heds- 5600/5640, and hedm-5500/ 5600 are high performance, low cost, two and three channel optical incremental encoders. these encoders emphasize high reliability, high resolution, and easy assembly. each encoder contains a lensed led source, an integrated circuit with detectors and output circuitry, and a codewheel which rotates between the emitter and detector ic. the outputs of the heds-5500/5600 and hedm- 5500/ 5600 are two square waves in quadrature. the heds-5540 and 5640 also have a third chan- nel index output in addition to the two channel quadrature. this index output is a 90 electrical degree, high true index pulse which is generated once for each full rotation of the codewheel. the heds series utilizes metal codewheels, while the hedm series utilizes a film codewheel allowing for resolutions to 1024 cpr. the hedm series is nont available with a third channel index. these encoders may be quickly and easily mounted to a motor. for larger diameter motors, the hedm-5600, and heds-5600/ 5640 feature external mounting ears. the quadrature signals and the index pulse are accessed through five 0.025 inch square pins located on 0.1 inch centers. standard resolutions between 96 and 1024 counts per revolution are presently available. consult local hewlett-packard sales repre- sentatives for other resolutions. applications the heds-5500, 5540, 5600, 5640, and the hedm-5500, 5600 provide motion detection at a low cost, making them ideal for high volume applications. typical applications include printers, plotters, tape drives, positioning tables, and automatic handlers. hedm-550x/560x heds-550x/554x heds-560x/564x 5965-5875e
2-91 package dimensions heds-5500/5540, hedm-5500 *note: for the heds-5600 and hedm-5600, pin #2 is a no connect. for the heds-5640, pin #2 is ch. i, the index output. heds-5600/5640, hedm-5600 *note: for the heds-5500 and hedm-5500, pin #2 is a no connect. for the heds-5540, pin #2 is ch. i, the index output.
2-92 theory of operation the heds-5500, 5540, 5600, 5640, and hedm-5500, 5600 translate the rotary motion of a shaft into either a two- or a three- channel digital output. as seen in the block diagram, these encoders contain 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 produce the digital waveforms. the codewheel rotates between the emitter and detector, causing the light beam to be interrupted 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 codewheel. 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 (also i and i in the heds-5540 and 5640). 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). in the heds-5540 and 5640, the output of the comparator for i and i is sent to the index processing circuitry along with the outputs of channels a and b. block diagram revolution. 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 electrical 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. the final output of channel i is an index pulse p o which is generated once for each full rotation of the codewheel. this output p o is a one state width (nominally 90 electrical degrees), high true index pulse which is coincident with the low states of channels a and b. definitions count (n): the number of bar and window pairs or counts per revolution (cpr) of the codewheel. one cycle (c): 360 electrical degrees ( e), 1 bar and window pair. one shaft rotation: 360 mechanical degrees, n cycles. position error ( dq ): the normalized angular difference between the actual shaft position and the position indicated by the encoder cycle count. cycle error ( d c): an indication of cycle uniformity. the differ- ence between an observed shaft angle which gives rise to one electrical cycle, and the nominal angular increment of 1/n of a
2-93 absolute maximum ratings parameter heds-55xx/56xx hedm-550x/560x storage temperature, t s -40 c to 100 c-40 c to +70 c operating temperature, t a -40 c to 100 c-40 c to +70 c supply voltage, v cc - 0.5 v to 7 v - 0.5 v to 7 v output voltage, v o - 0.5 v to v cc - 0.5 v to v cc output current per channel, i out -1.0 ma to 5 ma -1.0 ma to 5 ma vibration 20 g, 5 to 1000 hz 20 g, 5 to 1000 hz shaft axial play 0.25 mm ( 0.010 in.) 0.175 mm ( 0.007 in.) shaft eccentricity plus radial play 0.1 mm (0.004 in.) tir 0.04 mm (0.0015 in.) tir velocity 30,000 rpm 30,000 rpm acceleration 250,000 rad/sec 2 250,000 rad/sec 2 output waveforms direction of rotation: when the codewheel rotates in the counter- clockwise direction (as viewed from the encoder end of the motor), channel a will lead channel b. if the codewheel rotates in the clockwise direction, channel b will lead channel a. index pulse width (p o ): the number of electrical degrees that an index output is high during one full shaft rotation. this value is nominally 90 e or 1/4 cycle.
2-94 parameter symbol min. typ. max. units notes temperature heds series t a -40 100 c temperature hedm series t a -40 70 c non-condensing atmosphere supply voltage v cc 4.5 5.0 5.5 volts ripple < 100 mv p-p load capacitance c l 100 pf 2.7 k w pull-up count frequency f 100 khz velocity (rpm) x n/60 shaft perpendicularity 0.25 mm 6.9 mm (0.27 in.) from plus axial play (heds series) ( 0.010) (in.) mounting surface shaft eccentricity plus 0.04 mm (in.) 6.9 mm (0.27 in.) from radial play (heds series) (0.0015) tir mounting surface shaft perpendicularity 0.175 mm 6.9 mm (0.27 in.) from plus axial play (hedm series) ( 0.007) (in.) mounting surface shaft eccentricity plus 0.04 mm (in.) 6.9 mm (0.27 in.) from radial play(hedm series) (0.0015) tir mounting surface note: the module performance is guaranteed to 100 khz but can operate at higher frequencies. 2.7 k w pull-up resistors required for heds-5540 and 5640. recommended operating conditions part no. description sym. min. typ.* max. units heds-5500 pulse width error d p745 e heds-5600 logic state width error d s545 e (two channel) phase error df 220 e position error dq 10 40 min. of arc cycle error d c 3 5.5 e hedm-5500 pulse width error d p1045 e hedm-5600 logic state width error d s1045 e (two channel) phase error df 215 e position error dq 10 40 min. of arc cycle error d c 3 7.5 e heds-5540 pulse width error d p535 e heds-5640 logic state width error d s535 e (three phase error df 215 e channel) position error dq 10 40 min. of arc cycle error d c 3 5.5 e index pulse width p o 55 90 125 e ch. i rise after -25 c to +100 ct 1 10 100 250 ns ch. a or ch. b fall -40 c to +100 ct 1 -300 100 250 ns ch. i fall after -25 c to +100 ct 2 70 150 300 ns ch. b or ch. a rise -40 c to +100 ct 2 70 150 1000 ns note: see mechanical characteristics for mounting tolerances. *typical values specified at v cc = 5.0 v and 25 c. encoding characteristics encoding characteristics over recommended operating range and recommended mounting tolerances unless otherwise specified. values are for the worst error over the full rotation.
2-95 electrical characteristics electrical characteristics over recommended operating range. part no. parameter sym. min. typ.* max. units notes heds-5500 supply current i cc 17 40 ma heds-5600 high level output voltage v oh 2.4 v i oh = -40 m a max. low level output voltage v ol 0.4 v 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 heds-5540 supply current i cc 30 57 85 ma heds-5640 high level output voltage v oh 2.4 v i oh = -200 m a max. hedm-5500 low level output voltage v ol 0.4 v i ol = 3.86 ma rise time t r 180 ns c l = 25 pf fall time t f 40 ns r l = 2.7 k w pull-up hedm-5500 supply current i cc 30 57 85 ma hedm-5600 high level output voltage v oh 2.4 v i oh = -40 m a max. low level output voltage v ol 0.4 v i ol = 3.86 ma rise time t r 180 ns c l = 25 pf fall time t f 40 ns r l = 3.2 k w pull-up *typical values specified at v cc = 5.0 v and 25 c. hedm-5600
2-96 electrical interface to insure reliable encoding performance, the heds-5540 and 5640 three channel encoders require 2.7 k w ( 10%) pull-up resistors on output pins 2, 3, and 5 (channels i, a, and b) as shown in figure 1. these pull-up resistors should be located as close to the encoder as possible (within 4 feet). each of the three encoder outputs can drive a single ttl load in this configuration. the heds-5500, 5600, and hedm-5500, 5600 two channel encoders do not normally require pull-up resistors. however, 3.2 k w pull-up resistors on output pins 3 and 5 (channels a and b) are recommended to improve rise times, especially when operating above 100 khz frequencies. mechanical characteristics parameter symbol dimension tolerance [1] units codewheel fits these 2 3 4 +0.000 mm standard shaft diameters 5 6 8 -0.015 5/32 1/8 +0.0000 in 3/16 1/4 -0.0007 moment of inertia j 0.6 (8.0 x 10 -6 ) g-cm 2 (oz-in-s 2 ) required shaft length [2] 14.0 (0.55) 0.5 mm ( 0.02) (in.) bolt circle [3] 2 screw 19.05 0.13 mm mounting (0.750) ( 0.005) (in.) 3 screw 20.90 0.13 mm mounting (0.823) ( 0.005) (in.) external 46.0 0.13 mm mounting ears (1.811) ( 0.005) (in.) mounting screw size [4] 2 screw mounting m 2.5 or (2-56) mm (in.) 3 screw mounting m 1.6 or (0-80) mm (in.) external mounting ears m 2.5 or (2-56) mm (in.) encoder base plate 0.33 (0.130) mm (in.) thickness hub set screw (2-56) (in.) notes: 1. these are tolerances required of the user. 2. the heds-55x5 and 56x5, hedm-5505, 5605 provide an 8.9 mm (0.35 inch) diameter hole through the housing for longer motor shafts. see ordering information. 3. the heds-5540 and 5640 must be aligned using the aligning pins as specified in figure 3, or using the alignment tool as shown in encoder mounting and assembly. see also mounting considerations. 4. the recommended mounting screw torque for 2 screw and external ear mounting is 1.0 kg-cm (0.88 in-lbs). the recommended mounting screw torque for 3 screw mounting is 0.50 kg-cm (0.43 in-lbs).
2-97 mounting considerations the heds-5540 and 5640 three channel encoders and the hedm series high resolution encoders must be aligned using the aligning pins as specified in figure 3, or using the heds-8910 alignment tool as shown in encoder mounting and assembly. the use of aligning pins or alignment tool is recommended but not required to mount the heds-5500 and 5600. if these two channel encoders are attached to a motor with the screw sizes and mounting tolerances specified in the mechanical characteristics section without any additional mounting bosses, the encoder output errors will be within the maximums specified in the encoding characteristics section. the heds-5500 and 5540 can be mounted to a motor using either the two screw or three screw mounting option as shown in figure 2. the optional aligning pins shown in figure 3 can be used with either mounting option. the heds-5600, 5640, and hedm-5600 have external mounting ears which may be used for mounting to larger motor base plates. figure 4 shows the necessary mounting holes with optional aligning pins and motor boss. figure 1. pull-up resistors on heds-5x40 encoder outputs. figure 3. optional mounting aids. figure 2. mounting holes. 11.10 / 10.94 (0.438 / 0.431) 2.39 / 2.34 (0.096 / 0.092)
2-98 figure 4. mounting with external ears. 0.25 (0.010) x 45?chamfer 2 places a 0.15 (0.006) 2.39 / 2.34 (0.096 / 0.092) 11.10 / 10.94 (0.438 / 0.431) 0.8 (0.03) x 45?chamfer o a 0.05 (0.002)
2-99 3a. push the hex wrench into the body of the encoder to ensure that it is properly seated into the code wheel hub set screws. then apply a downward force on the end of the hex wrench. this sets the code wheel gap by levering the code wheel hub to its upper position. 3b. while continuing to apply a downward force, rotate the hex wrench in the clockwise direction until the hub set screw is tight against the motor shaft. the hub set screw attaches the code wheel to the motor's shaft. 3c. remove the hex wrench by pulling it straight out of the encoder body. 4. use the center screwdriver slot, or either of the two side slots, to rotate the encoder cap dot clockwise from the one dot position to the two dot position. do not rotate the encoder cap counterclockwise beyond the one dot position. the encoder is ready for use! encoder mounting and assembly 1. for heds-5500 and 5600: mount encoder base plate onto motor. tighten screws. go on to step 2. 1a. for heds-5540, 5640 and hedm-5500, 5600: slip alignment tool onto motor shaft. with alignment tool in place, mount encoder baseplate onto motor as shown above. tighten screws. remove alignment tool. 2. snap encoder body onto base plate locking all 4 snaps.
2-100 connectors manufacturer part number amp 103686-4 640442-5 dupont/berg 65039-032 with 4825x-000 term. hp heds-8902 (2 ch.) with 4-wire leads (designed to mechanically lock into the heds-5xxx, hedm-5x0x series) heds-8903 (3 ch.) with 5-wire leads molex 2695 series with 2759 series term. figure 5. heds-8902 and 8903 connectors. typical interfaces host processor hedsC55xx or heds-56xx or hedm-5x0x hp hctl-2016/ 2020 quadrature decoder/ counter ch. a ch. b host processor ch. b ch. a hedsC55xx or heds-56xx or hedm-5x0x hp hctl-1100 motion control ic * * n/a *
2-101 ordering information heds-5 option shaft diameter 01 - 2 mm 06 - 1/4 in. 02 - 3 mm 11 - 4 mm 03 - 1/8 in. 14 - 5 mm 04 - 5/32 in. 12 - 6 mm 05 - 3/16 in. 13 - 8 mm mounting type 5 - standard 6 - external mounting ears through hole 0 - none 5 - 8.9 mm (0.35 in.) outputs 0 - 2 channel 4 - 3 channel encoders with metal codewheels heds-8910 0 alignment tool (included with each order of heds-554x/564x three channel encoders) shaft diameter 01 - 2 mm 06 - 1/4 in. 02 - 3 mm 11 - 4 mm 03 - 1/8 in. 14 - 5 mm 04 - 5/32 in. 12 - 6 mm 05 - 3/16 in. 13 - 8 mm mounting type 5 - standard 6 - external mounting ears resolution (cycles/rev) b - 1000 cpr j - 1024 cpr through hole 0 - none 5 - 8.9 mm (0.35 in.) outputs 0 - 2 channel encoders with film codewheels heds-8910 0 alignment tool (included with each order of hedm-550x/560x two channel encoders) hedm-5 0 option resolution (cycles/rev) (heds-550x, 560x 2 channel) s - 50 cpr f - 256 cpr k - 96 cpr g - 360 cpr c - 100 cpr h - 400 cpr d - 192 cpr a - 500 cpr e - 200 cpr i - 512 cpr (heds-554x, 564x 3 channel) 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

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