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SMD-01A optical encoder head overview the SMD-01A is a high-precision optical encoder that employs a diffraction image projection method. it incorporates an oeic (opto-electric integrated circuit) and led light source in a single package. light emitted from the led is projected onto a scale, and the reflected diffraction image is focuse d on a photodiode. the reflected light contains position information that is recovered to detect the relative moveme nt between the SMD-01A and the scale. a photodiode array is used to reduce degradation in phase characteristics due to m ounting alignment. this allows the SMD-01A to be mounted without monitoring the output signal, unlike conventional high-precision optical encoders which typically need to be mounted and aligned while monitoring the output signal. features pinout (top view) ? package: miniature clear-mold package (5.3 4.3 1.68mm) 1. swl1 2. swl2 3. vcc 4. nc 5. nc 6. nc 7. swv 14. g 13. nc 12. v 11. v 10. vb 9. vb 8. vr ? resolution: 5 m (using 20 m pitch pattern scale and a-phase/b-phase signal detection) nd a ab b ef ? optimized oeic and optics design for easy mounting alignment ? led and oeic fabricated in a single package ? adjustable led brightness using external inputs ? analog (sine wave) output ? supply voltage: 3.13 to 5.25v ? current consumption: 12.2ma (typ) applications package dimensions (unit : mm ) ? linear motors ? precision stages ? sliders ? mounting equipment ? robots ? angle measurement equipment ? various encoder devices seiko npc corporation - 1
SMD-01A seiko npc corporation - 2 block diagram pin description number name i/o description 1 swl1 ip led brightness adjustment 1 2 swl2 ip led brightness adjustment 2 3 vcc - supply voltage (+) 4 nc - no connection (leave open circuit) 5 nc - no connection (leave open circuit) 6 nc - no connection (leave open circuit) 7 swv ip reference voltage (vref) select input h: vref=1.45v (typ) l: vref=2.25v (typ) *2 8 vref o reference voltage output 9 vbb o b-phase inverted analog signal (bb phase) output 10 vb o b-phase analog signal (b phase) output 11 vab o a-phase inverted an alog signal (ab phase) output 12 va o a-phase analog signal (a phase) output 13 nc - no connection (leave open circuit) 14 gnd - ground *1. ip: input with internal pull-up *2. it?s possible to use only by v cc =5.000.25v. vcc sw l 1 sw l 2 gnd led driver s i gna l processor ic va va b vb vbb vre f sw v led photodiodes ase sca l e reflective grating non-re fl ect i ve b photodiode ic encoder hea d
SMD-01A seiko npc corporation - 3 absolute maximum ratings parameter symbol rating unit supply voltage *1 v cc -0.3 to +5.5 v storage temperature *2 t stg -40 to 80 c *1. absolute maximum ratings are the values that must never exceed even for a moment. this product may suffer breakdown if any one of these parameter ratings is exceeded. operation and characteristics are guaranteed only when th e product is operated at recommended supply voltage range. *2. do not exceed the absolute maximum ratings. if they are exceeded, a characteristic and reliability will be degraded. recommended operating conditions parameter symbol rating unit conditions supply voltage v cc 3.13 to 5.25 v swv=h 4.75 to 5.25 v swv=l or h operating temperature t a -20 to 60 c response speed r t 0 to 2 m/s * since it may influence the reliability if it is used out of th e recommended operating conditions range, this product should b e used within this range.
SMD-01A seiko npc corporation - 4 electrical characteristics v cc =5v, ta=27c, unless otherwise noted parameter symbol conditions min typ max unit pins current consumption 1 i cc1 swl1=h swl2=h 4.0 12.2 23.0 ma vcc current consumption 2 i cc2 swl1=h swl2=l 7.0 16.9 30.0 ma vcc current consumption 3 i cc3 swl1=l swl2=h 11.0 21.0 35.5 ma vcc current consumption 4 i cc4 swl1=l swl2=l 2.0 6.0 13.5 ma vcc reference voltage v ref1 swv=h 1.00 1.45 2.00 v vref v ref2 *1 swv=l v c c =5.00 0.25v 1.40 2.25 3.20 a-phase output signal amplitude v ap-p vp-p swl1=h swl2=h *standard scale conditions 0.13 0.85 3.00 v va ab-phase output signal amplitude v abp-p vab b-phase output signal amplitude v bp-p vb bb-phase output signal amplitude v bbp-p vbb a-phase signal offset voltage v ao swl1=l swl2=l variation from vref -0.25 0.00 0.25 v va ab-phase signal offset voltage v abo vab b-phase signal offset voltage v bo vb bb-phase signal offset voltage v bbo vbb a-phase ? b-phase difference dp *standard scale conditions 50 90 130 va, vb output voltage fluctuation 1 v o1 difference between 0a and 50a sink current 0 - +30 mv vref, va, vab vb, vbb output voltage fluctuation 2 v o2 difference between 0a and 50a source current -30 - 0 mv vref, va, vab vb, vbb high-level input voltage v ih 0.8v cc - v cc v swl1, swl2, swv low-level input voltage v il 0 - 0.2v cc input current i o_sw input voltage = 0v 1 - 20 a *1. it?s possible to use only by v cc =5.000.25v. va vb 20 m v ref1 (or v ref2 ) v ap-p center v bo v ap-p v ao v bp-p center v bp-p v ao & v bo offsets represent the differences between the va & vb cycle center lines and v ref1 (or v ref2 ).
SMD-01A seiko npc corporation - 5 standard scale conditions electrical characteristics ratings apply under the following conditions: parameter conditions unit scale reflective surface reflection factor 57 % non-reflective surface reflection factor 5 % pattern 20m pitch (10m cr line/10m spacing) - smda-01 head alignment gap ( gap) 0.3 mm yaw angle ( ? y ) roll angle ( ? r ) pitch angle ( ? p ) 0 functional description the SMD-01A head emits 632nm center-wavelength visible light from the led and projects the light through a slit and onto a scal e having a 20 m pitch (10 m lines/10 m spacing) grating pattern. the reflected diffr action image is focused on a photodiode array to detect the relative movement between the head and the scal e. an analog signal (sine wa ve) with a cycle period of 20 m is output. the output signal is composed by the 90 phase difference a-phase and b-phase diffraction signals. led brightness switching function the signal amplitude can be adjusted by adjusting the led bright ness. the led brightness is adjusted by adjusting the led curre nt. the amplitude adjustment options are shown in the following table. swl1 high high low low swl2 high low high low a/b-phase analog signal amplitude 1.0 1.8 2.6 0
SMD-01A seiko npc corporation - 6 scale and head alignment the encoder head optical center position is offset from the physical center of the head by 0.77mm ( y) in the vertical direction and 0.0mm ( x) in the horizontal direction. if using a linear scale, only the offset in the scale width direction ( y) needs to be considered. if using a rotary scale, the scale offset in the horizontal direction ( x) must also be taken into account. conditions of optimum optics of this product may vary due to mounting tolerance of optical elements, so thorough evaluation is needed to set the conditions. particularly when using small-diameter rotary scale, effect of alignment conditions on signal amplitude and phase difference is greater than when using linear scale. individu alized alignment is recommended to obtain better product characteri stics. reference data: parameter conditions unit scale scale width (sw) 1 (min) mm smda-01 head alignment scale vertical offset ( y) 0.77 mm scale horizontal offset ( x) 0.0 mm
SMD-01A seiko npc corporation - 7 typical performances (*npc standard conditions scale and head alignment) alignment characteristics amplitude vs. gap ( gap) phase difference vs. gap ( gap) amplitude vs. yaw angle ( ? y ) phase difference vs. yaw angle ( ? y ) amplitude vs. roll angle ( ? r ) phase difference vs. roll angle ( ? r )
SMD-01A seiko npc corporation - 8 amplitude vs. pitch angle ( ? p ) phase difference vs. pitch angle ( ? p ) temperature characteristics amplitude vs. temperature (t a ) frequency characteristics amplitude vs. frequency
SMD-01A seiko npc corporation - 9 precaution for use wire involved in drive actuator should be placed as far away from SMD-01A and wire drawn out from SMD-01A (especially analog signal wire) as possible. the closer, the larger the noise to en coder signal. more digital signal chatterings occur when the no ise is larger, and position detection accuracy is deteriorated. capacitors shown below should be placed on vcc wire and gnd wire of SMD-01A for protection against noise. 1. swl1 0.1f (place as close as possible to head) 10f (regulator section) 5.00.25v or 3.30.17v 2. swl2 3. vcc 4. nc 5. nc 6. nc 7. swv SMD-01A 14. gnd 13. nc 12. va 11. vab 10. vb 9. vbb 8. vref packaging the SMD-01A is supplied on trays. the same trays are designed to withstand the baking temperature before reflow, so the devices can be left on the trays during the baking process. note. the trays can be stacked without problem during baking, but tape and labels must first be removed. pin no.1 tape labe l device orientation storage quantity: 100pcs (10 10) empty tray as cover
SMD-01A seiko npc corporation - 10 mounting precautions observe the following precautions when mounting the SMD-01A. soldering precautions ? the smd devices are hygroscopic (moisture absorbing). if the head is soldered after absorbing mo isture, the head plastic may c rack and the surfaces between the plastic a nd other materials may separate. ? when soldering, ensure there is no foreign matter adhering to the smd surface. ? after soldering, ensure that no mechanical stress or strong vibration is applied until the devices reach room temperature. infrared reflow method the following temperature profile conditions are recommended when soldering using the application of heat to the entire device. temperature profile co nditions (package surface temperature) preheating 120 sec (max) 40 sec (max) 4c/ sec or less 4c/sec or less +1.5 to +5c/sec -1.5 to -5c/sec 150c 250 c 190c 225c ? in accordance with ?storage and management after opening the package?, please reflow in time in an environment of default. ? n 2 atmosphere should be used in reflow chambers. ? number of reflows is up to two times. ? please make sure to reduce temperature ri pple of preheat to the extent possible. ? please do not touch the product after reflow soldering until it declines to room temperature, to prevent the resin deformation . ? note that inadequate reflow condition could cause significant fluctuation of output signal amplitude. storage and management after opening the package (1) before opening: stored at temperature of 30c or less, and humidity of 60% or less, please mounting within one year. (2) after opening: p lease mounting within 24 hours at temperature 30c or less, and humidity of 60% or less. if you have pass more than 24 hours, please make sure to bake the product at 125c 5c for 3 hours before the reflow, and please mounting within 24 hours at temperat ure 30 c or less, and humidity of 60% or less. baking by 125c should be performed only one time. *stored after opening, at temperature of 30c or less, and humidity of 60% or less, please mounting within one month.
SMD-01A seiko npc corporation - 11 please pay your attention to the following points at time of using the products shown in this document. 1. the products shown in this document (hereinafter ?produc ts?) are designed and manufactured to the generally accepted standar ds of reliability as expected for use in general electronic and electrical equipment, such as personal equipment, machine tools and measurement equipment. the products are no t designed and manufactured to be used in any other special equipment requiring extremely high level of reliability and safety, such as aero space equipment, nuclear power control equipment, medical equipment , transportation equipment, disaster prev ention equipment, security equipment. the products are not designed and manufactured to be used for the apparatus that exerts harmful influence on the huma n lives due to the defects, failure or malfunction of the produ cts. if you wish to use the products in that apparat us, please contact our sales section in advance. in the event that the products are used in such apparatus without our prior approval, we assume no responsibility whatsoever fo r any damages resulting from the use of that apparatus. 2. npc reserves the right to change the specifications of the pr oducts in order to improve the c haracteristics or reliability t hereof. 3. the information described in this document is presented only as a guide for using the products. no responsibility is assumed by us for any infringements of patents or other rights of the third parties whic h may result from its use. no license is granted by implicati on or otherwise under any patents or other rights of the third parties. then, we assume no responsibility whatsoever for any damages resulting from that infringements. 4. the constant of each circuit shown in this document is descri bed as an example, and it is not guaranteed about its value of the mass production products. 5. in the case of that the products in this document falls unde r the foreign exchange and foreign trade control law or other ap plicable laws and regulations, approval of the export to be based on those laws and regulations are necessary. cu stomers are r equested appropriat ely take steps to obtain required permissions or approvals from appropriate government agencies. seiko npc corporation 1-9-9, hatchobori, chuo-ku, tokyo 104-0032, japan telephone: +81-3-5541-6501 facsimile: +81-3-5541-6510 http://www.npc.co.jp/ email:sales@npc.co.jp nd16001e01 2016.02

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