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hedr-54xx series mid-sized housed encoder data sheet esd warning: normal handling precautions should be taken to avoid static discharge. description the hedr-542x series are high performance, cost-eff ec- tive, two-channel optional incremental housed encoders. these encoders emphasize high reliability, high resolution, and easy assembly. the hedr-542x housed encoders use refl ective technology to sense rotary position. this sensor consists of an led light source and a photodetector ic in a single so-8 surface mount package. the outputs of the hedr-542x encoders are two square waves in quadrature. these encoders may be quickly and easily mounted to a motor. applications the hedr-542x provides motion detection at a low cost, making them ideal for high volume applications. typical applications include vending machines and motor manu- facturing applications. note: avago technologies encoders are not recommend- ed for use in safety critical applications. eg. abs braking systems, power steering, life support systems and critical care medical equipment. please contact sales representa- tive if more clarifi cation is needed. available styles features ?? two channel quadrature output ?? quick and easy assembly ?? cost-eff ective ?? ideal for small motor systems ?? -10 c to +85 c operating temperature ?? right angle connector available ?? hub available in either a set screw confi guration or a press-fi t/adhesive mount confi guration ?? external mounting ears available right angle version (shown here with press fi t/adhesive mount hub option) external mounting ears version (shown here with set screw type hub)
2 package dimensions 15.2 17.9 5.0 ?23.0 2.0 46.0 52.0 8.5 11.7 13.9 14.4 1.5 b+5 a gnd ?23.0 15.2 17.4 17.9 5.0 ?23.0 note: typical dimensions in millimeters 11.7 13.9 1.5 b+5 a gnd ?23.0 detail a detail a b +5 v a nc gnd detail b detail b gnd nc a +5 v b
3 theory of operation the hedr-542x translates rotary motion of a shaft into a two channel digital output. as seen in the block diagram, the hedr-542x series has three key parts: a single light emitting diode (led) light source, a photodetector ic with a set of uniquely confi gured photodiodes, and a pair of lenses. the lens over the led focuses light onto the codewheel. light is either refl ected or not refl ected back to the lens over the photodetector ic. as the codewheel rotates an alternating pattern of light and dark corre- sponding to the pattern of the codewheel falls upon the photodiodes. this light is used to produce internal signals a and a', and b and b'. as part of this "push-pull" detector system, these signals are fed through comparators that are part of the signal processing circuitry to produce the fi nal outputs for channels a and b. de nitions count (n): for rotary motion, the number of bar and window pairs or counts per revolution (cpr) of the codewheel. for linear motion, the number of bar and window pairs per unit length (lines per inch [lpi] or lines per mm [lpmm]). one cycle (c): 360 electrical degree (e), 1 bar and window pair. one shaft rotation: 360 mechanical degrees, n cycles (rotary motion only). line density: the number of refl ective and non-refl ective pairs per unit length, expressed as either lines per inch (lpi) or lines per mm (lpmm). pulse width (p): the number of electrical degrees that an output is high during one cycle, nominally 180e or 1/2 a cycle. pulse width error ( ? p): the deviation in electrical degrees of the pulse width from its ideal value of 180e. state width (s): the number of the electrical degrees between a transition in the output of the channel b. there are 4 states per cycle, each nominally 90e. state width error ( ? s): the deviation in electrical degrees of each state width from its ideal value of 90e. phase ( ? ): the number of electrical degrees between the center of the high state on the channel a and the center of the high state of channel b. this value is nominally 90e. phase error ( ?? ): the deviation in electrical degrees of the phase from its ideal value of 90e. signal processing circuitry r v led gnd v cc ch a ch b gnd codewheel output waveforms direction of motor rotation when the codewheel rotates in the clockwise direction (as viewed from the encoder end of the motor), channel a will lead channel b. if the codewheel rotates in the counterclockwise direction, channel b will lead channel a. c p s1 s2 s3 s4 ? ch. i ch. a ch. b codewheel rotation amplitude all four states (s1 to s4) are maintained
4 absolute maximum ratings storage temperature -40 c to +85 c operating temperature -10-c to +85-c supply voltage -0.5 v to 7 v output voltage -0.5 v to v cc output current per channel -2.0 ma to 12 ma shaft axial play 0.25 mm shaft eccentricity plus radial play 0.04 mm radial play between housing and cover 0.2 mm C 0.5 mm distance between tip of codewheel shaft and pc board 0.4 mm C 0.5 mm distance between codewheel and stopper before reset 0.25 mm C 0.35 mm distance between codewheel and stopper after reset 0.75 mm concentricity misalignment between mounted base 0.12 mm plate center bore and motor shaft frequency 16 khz recommended operating conditions parameter symbol min. typical max. units notes temperature t a 085c supply voltage v cc 4.5 5.0 5.5 volts ripple < 100 mv pCp led current i led 13 15 18 ma load capacitance c l 100 pf 2.7 k ? pull-up electrical characteristics (over recommended operating conditions. typically at 25 c) parameter symbol min. typical max. units notes supply current i cc 18 33 ma high level output voltage v oh 2.4 v i oh = C2 ma min. low level output voltage v ol 0.4 v i ol = 12 ma max. encoding characteristics parameter symbol typical max. units pulse width error ? p 775e state width error ? s 15 60 e phase error ?? 15 60 e position error ?? 50 120 arcmin cycle error ? c 10 45 e
5 mechanical characteristics parameter dimension tolerance units codewheel fits these standard shaft diameters press fit/adhesive mount hub set screw hub 2, 3, 4 2, 3, 4, 5, (1/8) +0/C0.01 (+0/C0.0005) mm (in.) allowable motor shaft length press fit/adhesive mount hub set screw hub (uses size m1.5 allen wrench, not included) between 7.5 and 8.0 between 7.5 and 11.5 mm bolt circle diameter (2 holes) 16 to 18 mm mounting screw size m2 m2.5, (2-56) for external mounting ears mm (in.) electrical interface pull up resistors on output pins 2, 3, and 5 have already been integrated into the mid-sized encoder. each of the three encoder outputs can drive a single ttl load in this confi guration. connectors the connector to be used with the mid-sized encoder is molex part number 51021-0500. this is a 5 connector crimp wire to board connector. the connector used on the encoder is orientation proof type, 2 diff erent cables confi guration required for connec- tion to right angle and axial angle type encoder. pins confi guration hedr-542x series pin 1 gnd pin 2 nc pin 3 ch.a pin 4 5 v pin 5 ch.b
6 standard mounting mounting considerations the mid-sized encoder must be aligned using the optional aligning pins, as specifi ed in figure 1, by using the optional motor boss shown in figure 2, or by using an alignment tool or as shown in encoder mounting and assembly. figure 2. figure 1. mounting with external ears optional motor boss - diameter 9.96/10.01 max height 1.5 optional alignment pins - diameter 1.940/2.007. 2 places on 14.50 diameter circle. max height 1.9 m2 2 places equally spaced on bolt circle between 16 and 20 shaft length shaft length optional alignment pins- diameter 1.940/2.007. 2 places on 14.50 diameter circle. max height 1.9 optional motor boss - diameter 9.96/10.01 max height 1.5 m2 2 places equally spaced on diameter 46 bolt circle
7 encoder mounting and assembly press fit style encoder 1. if not using optional alignment pins or motor boss to locate the base plate, slip alignment tool onto motor shaft. slip encoder base plate into place on motor as shown below. tighten screws or attach with an adhesive. if using alignment tool, remove it. alignment tool base plate motor 2. place the hub in the housing assembly on top of the motor shaft. lining up the guide (connector side) at the bottom of the housing with the slot (indicator side) on the encoder base plate, the housing latches should be aligned to the respective baseplate catches now. press the housing assembly downward and slide the hub into and along the shaft, until the 3 latches make contact with the catches. motor shaft latch (3 position) catch (3 position) indicator slot (indicator side) indicator 60.0 note: this is a top view of the base plate. indicator is also indicating the connector direction. angular offset to optional alignment pin is 60. tolerance for the angle is 2. guide (connector side) 30.0
8 4. using the end of a pen or other appropriate tool, press the triangular portion of the housing assembly downward. recommended force is between 3.5 kgf to 4.0 kgf. this will set the codewheel and hub into their proper position through the internalguide of the triangular piece. when the triangular piece is released, it should naturally spring back to its original position, eliminating contact between the housing assembly and the codewheel. the encoder is now ready for use. 3. press down the housing assembly until it snaps into place. recommended force is 3.5 kgf minimum, 4.0 kgf nominal, and 4.5 kgf maximum. note that the encoder is shipped such that the housing assembly and the base plate are not being snapped together.
9 set screw style encoder 1. if not using optional alignment pins or motor boss to locate the base plate, slip alignment tool onto motor shaft. slip encoder base plate into place on motor as shown below. tighten screws or attach with an adhesive. if using alignment tool, remove it. alignment tool base plate motor 2. slip the set screw hub into the shaft. proper fi nger-wear must be worn to avoid contamination on codewheel surface (top of hub). place an allen wrench into the socket of the set screw while aligning it on the allen wrench groove. lining up the guide (connector side) at the bottom of the housing with the slot (indicator side) on the encoder baseplate, the housing latches should be aligned to the respective baseplate catches. move the housing assembly downward until the 3 latches make contact with the catches. housing assembly guide (connector side) slot (indicator side) motor shaft set screw hub allen wrench allen wrench groove
10 4. using the end of a pen or other appropriate tool, press the triangular portion of the housing assembly downward. recommended force is between 3.5 kgf to 4.0 kgf. then apply a downward force on the end of the allen wrench. this sets the codewheel position by levering the codewheel upward against internal guide of the triangular piece. while continuing to apply a downward force on both tools, rotate the allen wrench in the clockwise direction until the hub set screw is tightened against the motor shaft. remove the allen wrench by pulling it straight out of the housing assembly. when the triangular piece is released, it should naturally spring back to its original position, eliminating contact between the housing assembly and the codewheel. the encoder is now ready for use. 3. press down the housing assembly, holding the set screw and allen wrench in their initial position until the housing assembly snaps into place. recommended force is 3.5 kgf minimum, 4.0 kgf nominal, and 4.5 kgf maximum. motor allen wrench
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 in the united states and other countries. data subject to change. copyright ? 2005-2012 avago technologies. all rights reserved. obsoletes 5988-9450en av02-3576en - august 7, 2012 ordering information *note: part numbers currently available: a. hedr-5420-es201 b. hedr-5420-es202 c. hedr-5420-es203 d. hedr-5420-es211 e. HEDR-5420-ES214 f. hedr-5421-ep111 ordering information for alignment tool *hedr-5 4 x x C x x x x x output 2 = 2 channel connector 0 = standard/axial 1 = right angle/radial shaft 01 = 2 mm 02 = 3 mm 03 = 1/8 inch 11 = 4 mm 14 = 5 mm hub s2 = set screw with mounting ears base plate p1 = pressfi t without mounting ears base plate resolution e = 200 cpr shaft 01 = 2 mm 02 = 3 mm 03 = 1/8" 11 = 4 mm 14 = 5 mm hedr-5900-000

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