broadcom - 1 - introduction the AS38-H39E series encoder is a high-resolution optical absolute encoder produced by broadcom?, which offers 23-bit single-turn and 16-bit multi-turn counts, hence a combined 39-bit high resolution. the AS38-H39E series encoder is a house encoder consisting of a patterned disk, a light source, and photosensitive elements to translate the mechanical motion into electrical signal. the AS38-H39E series encoder has a built-in communication protocol that is supported by a full-duplex or half-duplex line transmissions drive, offering good noise immunity for more robust transmission of data up to 10 mb/s in harsh industrial application. because the product is intended for industrial application, esd protection circ uitry has been designed in to achieve class 3 esd immunity per iec -61000-4-2 standard. the AS38-H39E series is also compliant with ip50 per iec 60529 standard. the key advantage of the as38-h 39e series is its multi-turn tracking that employs energy-harvesting technology by harvesting the magnetic energy as the encoder shaft rotates. it is the gearless multi-turn counti ng that eliminates the gear wear-out or acoustics noise issue that is encountered in conventional geared multi-turn encoder. on the other hand, when comparing to battery backed up multi-turn counting, this technology does not require periodic maintenance of the battery backup components and the down time associated with it. operating theory structures-wise, the encoder contains two main functional blocks: the single-turn optical engine block and the energy-harvesting multi-turn counter block. the single-turn engine comprises a broadcom developed high-performance optical detector asic, which is accompanied by high-precision amplifiers circuitry, coupled with a special multi-track code disk that rotates between the led emitter and detector ic. on the multi-turn side, the multi-turn counting is enabled utilizing energy-harvesting te chnology. when the shaft is rotating, the magnet mounted on the shaft moves in tandem. the energy-harvesting coil module cuts the moving magnet field, and generates energy as a result. the beauty of the energy-harvesting effect is that the same amount of energy is generated independent of the rotation speed. the generated energy is sufficient to power up the revolution tracking circuitry. therefore, no miscounts occur even in the absence of external power supply. features ? 39-bit resolution: 16-bit ener gy-harvesting multi-turn and 23-bit optical single-turn ? built-in communication protocol (option): biss c mode, ssi mode and rs-485 half-duplex ? overall encoder outer diameter ?38 mm and maximum height of 40 mm ? supporting ? inch, 6-mm and 8-mm diameter of the blind hollow shaft benefits ? no battery or capacitor required for position detection during power failure ? immediate position detection on power up applications ? robotics ? factory automation ? linear positioning system ? cnc machine tool ? medical and lab equipment note broadcom encoders are not recommended for use in safety critical applications, e.g., abs braking systems, power steering, life support systems, and critical care medical equipment. contact a sales representative if more clarification is needed. AS38-H39E series 39-bit energy-harvesting multi-turn absolute encoder data sheet
broadcom - 2 - AS38-H39E series data sheet product specifications electrical specifications mechanical specifications environmental specifications parameter conditions min. typ. max. unit current consumption without load, tamb = 25c 115 ma supply voltage 4.5 5 5.5 v electrically permissible speed 6,000 min C1 parameter conditions min. typ. max. unit system accuracy with electrical correction, tamb = 25c 80arc-sec mechanical permissible speed 6,000 min C1 shaft radial play 0.05 mm shaft axial play 0.1 mm starting torque tamb = 25c 9.8 x 10 C3 n.m parameter conditions min. typ. max. unit storage temperature C20 105 c operating temperature C20 105 c relative air humidity (non-condensing) tamb = 40?c 90 rh% protection ip50 vibration per iec 60068-2-6 10g; 10~2000 hz shock per iec 60068-2-27 6 ms; half sine; 200g
broadcom - 3 - AS38-H39E series data sheet encoder specifications figure 1 shaft rotation note exposure to absolute maximum rating conditions for extended periods might affect reliability. parameter remarks resolution single-turn 23-bit (8388607 coun ts) and multi-turn 16- bit (65535 counts). counting direction increase with counter clockwise (ccw) shaft rotation, view from coupling end ( figure 1 ). initialization time 500 ms.
broadcom - 4 - AS38-H39E series data sheet interface diagram the following are examples of the circuit diag ram of full-duplex and half-duplex transceiver. full-duplex transceiver (biss c mode/ssi mode protocol) figure 2 circuit diagram of full-duplex transceiver half-duplex transceiver (rs-485 half-duplex protocol) figure 3 circuit diagram of half-duplex transceiver * termination resistor, 120 and 220 are recommended but ma y depend on the characteristic impedance of cable used. note connect encoder chassis and cable shield to frame ground (fg) in application for enhanced noise immunity in harsh operating conditions. controller encoder gnd ma+ / scl+ ma- / scl- slo+ / dout+ slo- / dout- fg transceiver (p/n: sn65lbc179q) transceiver (p/n: sn65lbc179q) gnd vcc 5v gnd vcc (5v) gnd a b 0.1uf 5v gnd y z d r *120 ? gnd 5v 1.2k ? 1.2k ? y z a b gnd 0.1uf 5v r d *120 ? gnd 1 2 3 4 5 6 fg shield wire shield wire controller encoder gnd data+ data- *220 ? *220 ? gnd fg ro di de ro /re /re de di transceiver (p/n: isl8485e) d d r r gnd 5v gnd 5v b/z a/y b/z a/y 0.1uf 5v 0.1uf 5v 1.2k ? 1.2k ? 1.2k ? 1.2k ? gnd vcc 5v gnd vcc (5v) gnd transceiver (p/n: isl8485e) 1 2 3 4 fg shield wire shield wire
broadcom - 5 - AS38-H39E series data sheet cable connection information note: cable provided is 200 mm 10 mm (included pigtail length) with awg28. no cable color AS38-H39E-bxxx (biss-c) (output: 7-core cable) AS38-H39E-sxxx (ssi) (output: 7-core cable) AS38-H39E-kxxx (rs-485 half-duplex) (output: 5-core cable) 1 red vcc, positive supply vcc, positive supply vcc, positive supply 2 black gnd, ground gnd, ground gnd, ground 3brownma+ scl+ data+ 4 white maC sclC dataC 5 orange slo+ dout+ n/a 6 blue sloC doutC n/a 7 cable shield strand cable shield, connect to chassis cable shield, connect to chassis cable shield, connect to chassis
broadcom - 6 - AS38-H39E series data sheet mechanical drawing package dimensions recommended shaft and mo unting requirement notes: dimensions are in millimeters. 3rd angle projection. unless otherwise specified, all tolerances are within 0.5 mm. recommended to have a recess on motor mounting surface to prevent encoder shaft interference with motor base.
broadcom - 7 - AS38-H39E series data sheet ordering information note refer to factory for sample order and lead time.
for product information and a complete list of distributors, please go to our web site: www.broadcom.com . broadcom, the pulse logo, connecting everything, avago technologies, avago, and the a logo are among the trademarks of broadcom in the united states, certain other countries and/or the eu. copyright ? 2017 broadcom. all rights reserved. the term "broadcom" refers to broadcom limited and/or its subsidiaries. for more information, please visit www.broadcom.com . broadcom reserves the right to make changes without further notice to any products or data herein to improve reliability, function, or design. information furnished by broadcom is believed to be accurate and reliable. however, broadcom does not assume any liability arising out of the application or use of this information, nor the application or use of any product or circuit described herein, neither does it convey any license under its patent rights nor the rights of others. AS38-H39E-ds100 C march 31, 2017
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