Data Sheet AS38-H39E Series 39-Bit Energy-Harvesting Multi-Turn Absolute Encoder On the multi-turn side, the multi-turn counting is enabled Introduction utilizing energy-harvesting technology. When the shaft is rotating, the magnet mounted on the shaft moves in tandem. The Broadcom AS38-H39E series encoder is a high- The energy-harvesting coil module cuts the moving magnet resolution optical absolute encoder that offers 23-bit single- field, and generates energy as a result. turn and 16-bit multi-turn counts, hence a combined 39-bit high resolution. The AS38-H39E series encoder is a house The beauty of the energy-harvesting effect is that the same encoder consisting of a patterned disk, a light source, and amount of energy is generated independent of the rotation photosensitive elements to translate the mechanical motion speed. The generated energy is sufficient to power up the into electrical signal. revolution tracking circuitry. Therefore, no miscounts occur even in the absence of external power supply. The AS38-H39E series encoder has a built-in communication protocol that is supported by a full-duplex or half-duplex line Features transmissions drive, offering good noise immunity for more robust transmission of data up to 10 Mb/s in harsh industrial 39-bit resolution: 16-bit energy-harvesting multi-turn and application. Because the product is intended for industrial 23-bit optical single-turn application, ESD protection circuitry has been designed in to Built-in communication protocol (option): BiSS C mode, achieve Class 3 ESD immunity per IEC -61000-4-2 standard. SSI mode and RS-485 half-duplex The AS38-H39E series is also compliant with IP50 per IEC Overall encoder outer diameter 38 mm and maximum 60529 standard. height of 40 mm Supporting inch, 6-mm and 8-mm diameter of the blind The key advantage of the AS38-H39E series is its multi-turn hollow shaft tracking that employs energy-harvesting technology by harvesting the magnetic energy as the encoder shaft rotates. Benefits It is the gearless multi-turn counting that eliminates the gear No battery or capacitor required for position detection wear-out or acoustics noise issue that is encountered in during power failure conventional geared multi-turn encoder. On the other hand, Immediate position detection on power up when comparing to battery backed up multi-turn counting, this technology does not require periodic maintenance of the Applications battery backup components and the down time associated Robotics with it. Factory automation Operating Theory Linear positioning system CNC machine tool Structures-wise, the encoder contains two main functional Medical and lab equipment blocks: the single-turn optical engine block and the energy- harvesting multi-turn counter block. The single-turn engine NOTE: Broadcom encoders are not recommended for use comprises a Broadcom developed high-performance optical in safety critical applications, e.g., ABS braking detector ASIC, which is accompanied by high-precision systems, power steering, life support systems, and amplifiers circuitry, coupled with a special multi-track code critical care medical equipment. Contact a sales disk that rotates between the LED emitter and detector IC. representative if more clarification is needed. Broadcom AS38-H39E-DS101 December 9, 2019AS38-H39E Series Data Sheet 39-Bit Energy-Harvesting Multi-Turn Absolute Encoder Product Specifications Electrical Specifications Parameter Conditions Min. Typ. Max. Unit Current Consumption Without load, Tamb = 25C 115 mA Supply Voltage 4.5 5 5.5 V 1 Electrically Permissible Speed 6,000 min Mechanical Specifications Parameter Conditions Min. Typ. Max. Unit System Accuracy With electrical correction, 80 Arc-sec Tamb = 25C 1 Mechanical Permissible Speed 6,000 min Shaft Radial Play 0.05 mm Shaft Axial Play 0.1 mm 3 Starting Torque Tamb = 25C N.m 9.8 x 10 Environmental Specifications Parameter Conditions Min. Typ. Max. Unit Storage Temperature 20 105 C Operating Temperature 20 105 C Relative Air Humidity (Non-Condensing) Tamb = 40C 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 AS38-H39E-DS101 2