aedx-8xxx-xxx 2- or 3-channel incremental encoder kit with codewheel data sheet description the aedx-8xxx comes in an option of two-channel or three-channel optical incremental encoder kit with code - wheel integrated in a protective housing. the encoder is lead free and compliant to the rohs directive. each en - coder kit consists of a collimated led source and a detec - tor ic enclosed within a small plastic package. the aedx-8xxx optical encoder has two-channel quadra - ture outputs (a,b) plus a third channel index output (i). there are three index options available. i.e. ungated, gat - ed-90 and gated-180 electrical degree index pulse. the aedx-8xxx series optical encoder is designed for use with motors with shaft diameters of 2mm and up to 5mm. the quadrature, index and power supplied to the encoder are accessed through an 8-pin male connector of 1.25 mm pitch. the aedx-8xxx solution enables the servo system to be more compact. with the aid of alignment jig, the assembly process will also require less alignment time, thus making the assembly process much easier for servo motor inte - gration. features ? 3-channel diferential output (a,b) with ungated, gated- 90 and gated-180 index pulse (i) ? 2-channel diferential output available ? up to 500 cycles per revolution (cpr) ? up to 30000 rpm motor speed ? -40 c to 100 c operating temperature ? single 5 v supply ? integrated rs-422 line driver ? quick and easy assembly assembly view note: avago technologies encoders are not recommended for use in safety critical applications, e.g., abs braking sys - tems, power steering, life support systems and critical care medical equipment. avagos products and software are not specifcally designed, manufactured or authorized for sale as parts, components or assemblies for the planning, con - struction, maintenance or direct operation of a nuclear facility or for use in medical devices or applications. customers are solely responsible, and waive all rights to make claims against avago or its suppliers, for all losses, damage, expense or liability in connection with such use. please contact your local sales representative if more clarifcation is needed. applications the aedx-8xxx provides motion detection for dc servo motor and closed loop stepper motor feedback system in the following applications: ? pick and place machines ? semiconductor equipment ? factory automation equipment baseplate codewheel & hub sensor chassis housing
2 theory of operation the aedx-8xxx optical encoder is a housed solution with integrated encoder and codewheel. the encoder trans - lates the rotary motion of a shaft into incremental digital outputs. the encoder contains a single light emitting diode (led) as the light source. the light is collimated into a parallel beam by means of polycarbonate lens located directly over the led. opposite the emitter is a detector ic. this ic consists of multiple sets of photo detectors and signal processing circuitry necessary to produce the digital wave - form output. the codewheel rotates between the emitter and detector, causing the light beam to be interrupted by pattern of spaces and bars on the codewheel. the photo - diodes that detect these interruptions are arranged in a pattern that corresponds to the radius and design of the codewheel. these detectors are also spaced in such way that light period on one pair of detectors corresponds to dark period on adjacent pair of detectors. the photodiode outputs are then fed through the signal processing circuit - ry that produce the fnal outputs for channel a and b. due to this integrated phasing technique, the digital output of channel a is in quadrature with that of channel b (90 elec - trical degrees out of phase). as a standard, the outputs are fed through a standard rs422 line driver to deliver the dif - ferentials signals at the fnal encoder output. defnitions cycles (n): the number of electrical cycles per revolution (cpr). note: cpr refers to the raw signal from encoder, that is the cycles before 4x decode. one cycle: 360 electrical degrees (e). one shaft rotation: 360 mechanical degrees. cycle error (?c): an indication of cycle uniformity. the dif - ference between an observed shaft angle which gives rise to one electrical cycle, and the nominal angular increment of 1/n of a revolution. pulse width (p): the number of electrical degrees that an output is high during 1 cycle. this value is nominally 180e or 1/2 cycle. pulse width error (?p): the deviation, in electrical degrees, of the pulse width from its ideal value of 180e. state width (s): the numbers of electrical degrees be - tween transitions in the output of channel a and the neighboring transition in the output of 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 numbers 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 90e for quadrature output. phase error (?): the deviation of the phase from its ideal value of 90e. index pulse width (po): the number of electrical degrees that an index is high with reference to channel a or channel b during one full shaft rotation. absolute maximum ratings [1,2] parameter symbol min. max. units 1. storage temperature aeds series t s -20 85 c storage temperature aedt series t s -40 100 c 2. supply voltage vcc -0.5 7 v 3. output voltage vout -0.5 vcc v 4. output current per channel iout - 150 ma 5. shaft axial play - 0.100 mm 6. shaft radial play plus eccentricity - 0.080 mm note: 1. absolute maximum ratings are those values beyond which the safety of the device cannot be guaranteed. they are not meant to imply that the device should be operated at these limits. 2. stresses greater than those listed under absolute maximum ratings may cause permanent damage to the device. exposure to absolute maximum rating conditions for extended periods may afect reliability.
3 recommended operating conditions parameter symbol min. typ. max. units notes 1. operating temperature aeds series t a -20 - 85 c operating temperature aedt series t a -40 - 100 c 2. supply voltage v cc 4.5 5.0 5.5 v 3. output frequency ( 200 cpr) f - - 100 khz velocity(rpm) x n/60 4. output frequency ( 400 & 500 cpr) - - 200 encoding characteristics (vcc = 4.5 to 5.5v, tamb = -40 to +100 c) aedx-8xxx-exx (200 cpr only) parameter symbol min. typ.(3) max units notes 1. pulse width error ? p - 5 35 e 2. state width error ? s - 3 35 e 3. phase error ? - 2 20 e 4. cycle error ? c - 5 15 e 5. index pulse width un-gated po 220 360 500 e index pulse width gated 90 e po 60 90 120 e index pulse width gated 180 e po 140 180 220 e 6. position error ? - 15 50 min. of arc note 3: typical values specifed at vcc = 5.0v and 25 c encoding characteristics (vcc = 4.5 to 5.5v, tamb = -40 to +100 c) aedx-8xxx-xxx (400 & 500cpr) parameter symbol min. typ.(3) max units notes 1. pulse width error ? p - 7 60 e 2. state width error ? s - 5 60 e 3. phase error ? - 2 35 e 4. cycle error ? c - 7 30 e 5. index pulse width un-gated po 220 360 500 e index pulse width gated 90 e po 50 90 130 e index pulse width gated 180 e po 135 180 225 e 6. position error ? - 20 60 min. of arc note 3: typical values specifed at vcc = 5.0v and 25 c electrical characteristics (v cc = 4.5 to 5.5v, t amb = -40 to +100c) parameter symbol min. typ. [1] max units notes 1. supply current i cc - 42 50 ma 2. output high level v oh 2.5 3.4 - v io = -20ma 3. output low level v ol - 0.3 0.5 v io = 20ma 4. output current i o - 25 40 ma 5. rise time t r - 30 100 ns 6. fall time t f - 30 100 ns note: 1. typical values specifed at vcc = 5.0v and 25c.
4 pin assignments pin signal description pin 1 gnd ground pin 2 a+ digital output pin 3 a- digital output pin 4 b+ digital output pin 5 b- digital output pin 6 i+ digital output pin 7 i- digital output pin 8 vcc voltage input figure 1. output waveforms for counter-clockwise rotation, viewed from the top of the encoder. pin 1 pin 8 s 1 s 2 s 3 s 4 p c p o 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v c h . a c h . b c h . i c h . i - c h . a - c h . b - p o 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v c h . i c h . i - g a t e d 1 8 0 e g a t e d 9 0 e p o 0 . 5 v 2 . 5 v 0 . 5 v 2 . 5 v c h . i c h . i - u n g a t e d output waveforms
5 electrical interface note: output+ represents a+, b+, or i+ digital output from the encoder. output- represents a-, b-, or i- digital output from the encoder. load resistance *rt is optional although highly recommended to reduce refection. package dimensions dimensions in mm unless otherwise stated. tolerance: +/- 0.1mm figure 2. mechanical dimensions for mounting option 1 (aedx-8x0x) direction of motor rotation direction of rotation: when the codewheel rotates in the counter-clockwise direction viewing from the top of the en - coder kit, channel a will lead channel b. if the codewheel rotates in the opposite direction, channel b will lead channel a. 26ls31
6 figure 3. mechanical dimensions for mounting option 2 (aedx-8x1x) mounting considerations option 1 (aedx-8x0x) with protruded external mounting ear hole option 2 (aedx-8x1x) with internal mounting hole dimensions in mm unless otherwise stated. tolerance: +/- 0.1mm caution: for optimal performance, base plate and plastic housing assembly are designed for a one time assembly process only. removal and re-assembly process should be avoided due to the potential weakness of the latch after re-assembly.
7 ?4.010 ?10.400 0.005 0.87 0.5 0.3 20.00 1.12 section a-a a a front1 +0.010 0 ?5.010 ?10.400 0.005 0.87 0.5 0.3 18.20 0.22 section a-a a a front1 +0.010 0 mounting alignment tool alignment tool for aedx-8xxx,4mm (heds-8938-011) alignment tool for aedx-8xxx,5mm(heds-8938-014)
8 mechanical characteristics parameter dimension tolerance units notes 1. shaft diameter tolerance 2, 3, 4, 5 0 -0.008 mm 2. recommended shaft length 5 to 10 n/a mm 3. mounting screw size 2 x m2 n/a mm 4. recommended screw torque 0.6 n/a lb. inch 5. encoder base plate thickness 3.85 0.1 mm recommended mating connectors temperature option manufacturer part number description aeds series molex 53261-0871 connector box type, 8-pin, 1.25mm pitch aedt series hirose df13a-8p-1.25h connector box type, 8-pin, 1.25mm pitch aeds-series (heds-8911-152) specifcation: 1. housing, 8p, pitch: 1.25mm 2. terminal, #26~28awg 3. wire, ul1007 #28awg-str 4. blue color aedt-series (hedt-8912-152) specifcation: 1. housing, 8p, pitch: 1.25mm 2. terminal, #26~30awg 3. wire, ul1007 #28awg-str 4. grey color loading view 8 1 tinned od = 0.7mm(max) tinned l = 20.5mm 1523.0mm mating view 8 1 tinned od = 0.7mm(max) tinned l = 20.5mm 1523.0mm
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 ? 2005-2008 avago technologies. all rights reserved. av02-1240en - september 26, 2008 r e s o l u t i o n o p t i o n s ( c y c l e / r e v ) e - 2 0 0 c p r h - 4 0 0 c p r a - 5 0 0 c p r s h a f t d i a m e t e r 0 1 - 2 m m 0 2 - 3 m m 1 1 - 4 m m 1 4 - 5 m m m o u n t i n g t y p e 0 - e x t e r n a l e a r m o u n t i n g 1 - s t a n d a r d m o u n t i n g i n d e x g a t i n g 0 - g a t e d 9 0 o e 1 - g a t e d 1 8 0 o e 2 - u n - g a t e d o p e r a t i n g t e m p e r a t u r e s - 2 0 o c t o 8 5 o c t - 4 0 o c t o 1 0 0 o c a e d 8 o p t i o n c h a n n e l s 0 - 2 c h a n n e l 1 - 3 c h a n n e l ordering information connectors ordering information: 1. heds-8911-152 - connectors for aeds-8xxx series 2. hedt-8912-152 - connectors for aedt-8xxx series alignment tool ordering information: 1. heds-8938-001 - alignment tool for aedx-8xxx-x01 series (2mm shaft diameter option) 2. heds-8938-002 - alignment tool for aedx-8xxx-x02 series (3mm shaft diameter option) 3. heds-8938-011 - alignment tool for aedx-8xxx-x11 series (4mm shaft diameter option) 4. heds-8938-014 - alignment tool for aedx-8xxx-x14 series (5mm shaft diameter option)
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