AS37-H39B Series 39-Bit Battery Backup Multi-Turn Absolute Encoder Data Sheet to ensure minimum current consumption during battery mode Introduction operation. Therefore, no miscounts occur even in the absence The AS37-H39B series encoder is a high-resolution optical of external power supply. absolute encoder produced by Broadcom, which offers 23-bit single-turn and 16-bit multi-turn counts, hence a combined Features 39-bit high resolution. The AS37-H39B series encoder is a house encoder consisting of a patterned disk, a light source, 39-bit resolution: 16-bit battery backup multi-turn and and photosensitive elements to translate the mechanical 23-bit optical single-turn motion into electrical signal. Built-in communication protocol (option): BiSS C mode, SSI mode and RS-485 half-duplex The AS37-H39B series encoder has a built-in communication Overall encoder outer diameter 37 mm and typical protocol that is supported by a full-duplex or half-duplex line mounting height 28 mm transmissions drive, offering good noise immunity for more robust transmission of data up to 10 Mb/s in harsh industrial Supporting standard hollow taper shaft, short hollow application. Because the product is intended for industrial taper shaft and inch, 6-mm and 8-mm diameter of the application, ESD protection circuitry has been designed in to hollow blind shaft options. achieve Class 3 ESD immunity per IEC -61000-4-2 standard. The AS37-H39B series is also compliant with IP40 per IEC 60529 Benefits standard. High resolution with higher measurement accuracy and The key advantage of the AS37-H39B series is multi-turn better speed ripple control. tracking employs battery backup technology. It is gearless Immediate position detection upon power up without the multi-turn counting that eliminates the gear wear-out or need of system homing. acoustics noise issue that is encountered in conventional Hollow taper shaft design for China Servo motor market. geared multi-turn encoder. Short hollow taper shaft option for low height application. Small OD and low height for ease of integration to small Operating Theory size motor. Structures-wise, the encoder contains two main functional blocks: the single-turn optical engine block and the battery Applications backup multi-turn counter block. The single-turn engine comprises the Broadcom developed high-performance optical Robotics detector ASIC, which is accompanied by high-precision Factory automation amplifiers circuitry, coupled with a special multi-track code disk CNC machine tool that rotates between the LED emitter and detector IC. On the multi-turn side, the multi-turn counting is enabled NOTE Broadcom encoders are not recommended utilizing battery backup counter technology. During battery for use in safety critical applications, e.g., ABS mode (encoder operates in main power OFF state), the battery braking systems, power steering, life support backup circuitry periodically powers up the LED emitter and systems, and critical care medical equipment. enables the photo sensor to scan the code disk multi-turn Contact a sales representative if more tracks for detection of shaft rotation. In order to prolong the clarification is needed. battery life, extra effort has been put in the design of the ASIC Broadcom - 1 -AS37-H39B Series Data Sheet 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 4 2 Electrically Permissible Acceleration Normal mode 8.0 x 10 rad/s 4 Battery mode 4.0 x 10 External Battery Supply Voltage 3.6 4.5 V Battery Mode Current Consumption Tamb = 25C 95 A Note: Normal mode: Encoder operates on encoder main power supply. Battery mode: Encoder operates inOF State, while multi-turn data is tracked by battery circuitry 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 IP40 Vibration Per IEC 60068-2-6 10G 10~2000 Hz Shock Per IEC 60068-2-27 6ms Half Sine 200G Broadcom - 2 -