6.2 ?0.20
(0.244 ?0.008) 1.270
(0.050) 1 234 8765 typ. 3.94 ?0.13 *
(0.155 ?0.005) 1.97
(0.078) ref. ref. 0.38 ?0.08
(0.016 ?0.003) 3.18 ?0.13
(0.125 ?0.005) 5.08 ?0.13 *
(0.200 ?0.005) 1.40 ?0.02
(0.055 ?0.001) 1.52
(0.06) ref. pin one
indicator
location 0.025
(0.001) min. 1.84
(0.072) ref. 0.700 r
(0.0276) ref. lead coplanarity 0.051
(0.002) 0.23 ?0.03
(0.009 ?0.001) 0.59
(0.023) min. 0.18 ?0.08
(0.007 ?0.003) 1 2 3 4 8 7 6 5 nc gnd a v cc v led nc b gnd notes:
*flash may add 0.38 (0.015) max.
at parting line.
dimensions in millimeters (inches).
for the 1channel hedr-8010, pin 6
is considered nc. reflective optical surface mount encoders technical data hedr-8000 series hedr-8100 series hedr-8010 series features ? reflective technology ? surface mount so-8 package ? two channel quadrature outputs for direction sensing ? two encoding resolution options: C 2.76 C 2.95 lines/mm (70 C 75 lines/inch) C 5.91 lines/mm (150 lines/inch) description the hedr-8000/8100 series encoders use reflective technol- ogy to sense rotary or linear position. this sensor consists of an led light source and a photodetector ic in a single so-8 surface mount package. when used with a reflective codewheel or codestrip, this device can sense rotary or linear position. esd warning: normal handling precautions should be taken to avoid static discharge. outline drawing
2 v led gnd v cc ch a ch b gnd signal
processing
circuitry r codewheel
or
codestrip block diagram the reflective surface mount optical encoders provide two square wave outputs in quadra- ture for count and direction information. these ttl compatible outputs correspond to the alternating reflective/non- reflective pattern of the codewheel or codestrip. the hedr-8000/8100 series encoders can be used over a range of codewheel and codestrip resolutions. the hedr-8000/ 8100 reflective encoder can operate from 2.76 to 2.95 lines per mm (70 to 75 lines per inch). the hedr-8100 can be used with a codewheel or codestrip with 150 lines per inch (5.91 lines per mm). applications the hedr-8000/8100 series provides two channel motion sensing at a very low cost, making it ideal for high volume applications. its small size and surface mount capability make it ideal for printers, copiers, card readers, and consumer product applications. 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 hedr-8000/8100 series combines an emitter and a detector in a single surface mount so-8 package. when used with a codewheel or codestrip, the reflective sensors translates rotary or linear motion into a two channel digital output. as seen in the block diagram, the hedr-8000/8100 series has three key parts: a single light emitting diode (led) light source, a photodetector ic with a set of uniquely configured photodiodes, and a pair of lenses molded into the package. the lens over the led focuses light onto the codewheel or codestrip. light is either reflected or not reflected back to the lens over the photodetector ic. as the codewheel rotates or codestrip passes by, an alternat- ing pattern of light and dark corresponding 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 compara- tors to produce the final outputs for channels a and b.
3 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 on channel a and the center of the high state on channel b. this value is nominally 90 e. phase error ( d f ): the deviation in electrical degrees of the phase from its ideal value of 90 e. direction of rotation: when the codewheel or codestrip moves in the direction from pin 1 to pin 4, as viewed when looking down on the lenses, channel b will lead channel a. if the codewheel or codestrip moves in the opposite direction, channel a will lead channel b. optical radius (rop): for rotary motion, the distance from the codewheels center of rotation to the center line connecting the two lenses of the encoder. gap (g): the distance from the top of the package to the surface of the reflective codewheel or codestrip. specular reflectance (r f ): a measure of a surfaces reflective finish. this is quantified by the amount of light reflected when hit with an incident beam. a device called a scatterometer is used to quantify specular reflectance on a percent scale. (contact factory for more information.) radial and tangential misalignment error (e r , e t ): for rotary motion, mechanical misalignment in the radial and tangential directions relative to the codewheel. angular misalignment error (e a ): angular misalignment of the sensor in relation to the tangential direction. this applies for both rotary and linear motion. output waveforms hedr-8000 shaft codewheel radial tangential hedr-8000 shaft codewheel e a s1 s2 s3 s4 f p c ch. b ch. a all four states (s1 to s4)
are maintained. codewheel rotation or linear movement amplitude definitions 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 degrees ( e), 1 bar and window pair. one shaft rotation: 360 mechanical degrees, n cycles (rotary motion only). line density: the number of reflective and non-reflective 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 180 e or 1/2 a cycle. pulse width error ( d p): the deviation in electrical degrees of the pulse width from its ideal value of 180 e.
4 encoding characteristics encoding characteristics over the recommended operating conditions and mounting conditions. parameter symbol typical maximum units notes pulse width error d p15 55 e hedr-8010 pulse width error (ch.a,ch.b) d p16 75 e hedr-8100 phase error df 10 60 e hedr-8100 pulse width error (ch.a,ch.b) d p 15,25 55,75 e hedr-8000 phase error df 12 60 e hedr-8000 recommended operating conditions parameter symbol min. typ. max. units notes temperature t a -10 85 c supply voltage v cc 4.5 5.0 5.5 volts ripple < 100 mvp-p led current i led 13 15 18 ma see current limiting resistor for led load capacitance c l 100 pf 2.7 k w pull-up count frequency f 15 khz velocity (rpm) x n/60 radial misalignment e r 0.38 mm ( 0.015) (in.) tangential misalignment e t 0.38 mm ( 0.015) (in.) angular misalignment e a 0 1.5 deg. codewheel or codestrip g 1.52 2.03 2.54 mm hedr-8000 gap (0.060) (0.080) (0.100) (in.) hedr-8010 g 1.02 1.52 2.03 mm hedr-8100 (0.040) (0.060) (0.080) (in.) codewheel or codestrip r f 60% as measured on tma specular reflectance m scan scope (see note 1) codewheel/codestrip tilt c t 0 1 deg. codewheel/codestrip lpmm 2.76 2.95 lines/mm hedr-8000 resolution (lpi) (70) (75) (lines/in.) hedr-8010 lpmm 5.91 lines/mm hedr-8100 (lpi) 150 (lines/in.) notes: 1. contact factory for more information regarding measurement of specular reflectance. absolute maximum ratings storage temperature, t s -40 c to 85 c operating temperature, t a -10 c to 85 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 note: exposure to extreme light intensity (such as from flashbulbs or spotlights) can cause permanent damage to device.
5 parameter symbol min. max. units notes window/bar ratio ww/wb 0.9 1.1 specular reflectance r f 60 85 reflective bars C 10 non-reflective bars line density lpmm 2.76 2.95 lines/mm hedr-8000 (lpi) (70) (75) (lines/inch) hedr-8010 lpmm 5.91 lines/mm hedr-8100 (lpi) (150) (lines/inch) window length lw 1.80 2.31 mm (inches) mm (0.071) (0.091) (inches) contact factory for further information on compatible codewheel and codestrips. electrical characteristics electrical characteristics over recommended operating conditions. typical values at 25 c. parameter symbol min. typ. max. units notes supply current i cc 2.2 5.0 ma high level output voltage v oh 2.4 v i oh = -40 m a min. low level output voltage v ol 0.4 v i ol = 3.86 ma rise time t r 150 200 ns c l = 25 pf r l = 2.7 k w fall time t f 50 60 ns current limiting resistor for led a resistor to limit current to the led is required. the recom- mended value is 220 w ( 10%) and should be placed in series between the 5 v supply and pin 8 of the device (v led ). this will result in an led current of approximately 15 ma. r op w b w w l w l w w w w b recommended codewheel and codestrip characteristics
6 r op 1 2 3 4 8 7 6 5 2.03 ?0.51
(0.080 ?0.020) 11.00 mm (0.433 in.) < r op < * ir soldering conditions the following recommended ir soldering profile meets the specifications of the electronic industries association of japan (eiaj): 90 ?30 s 30 ?10 s 10 ?1 s 235? max. 230? ?5? 200? time (s) temperature (?) 150? ?10? mounting conditions *these dimensions are for hedr-8000. please refer to recommended operating conditions table for hedr-8100. 1. 150 10 c for 90 30 seconds 2. greater than 200 c for 30 10 seconds 3. 230 c 5 c for 10 1 second recommendation: please refer to application note 1079: design and performance considerations with hedr-8000 for additional product information.
7 06 12 hedr-5120# e * h* * ordering information a. modules hedr-5120 opt rop = 11 mm, 2 channels resolution (cycle/rev) shaft diameter e = 200 cpr 06 = 1/4 in. h = 408 cpr 1/2 = 6 mm * b. codewheel: reflective hedr-8 resolution type 0 = low resolution 1 = high resolution 00 opt 2 lines/inch units in shipping tube 0 = 50 units 2 = 3 units (designers kit) 3 = 100 units 4 = 1500 units 5 = 500 units k = 75 lpi p = 150 lpi q = 180 lpi 02345 hedr-8000#2k **** hedr-8100#2p ***** hedr-8100#2q * * hedr-8010#2k *
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 ? 2003 agilent technologies, inc. obsoletes 5988-4214en january 16, 2003 5988-5310en
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