AR49-M49M ABRACON | Alldatasheet
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Broadcom AR49-M49M-M25S-DS101 December 4, 2024
Description
The Broadcom® AR49 series is an optical absolute encoder module that offers up to 25-bit single-turn (ST) position information and 24-bit multi-turn (MT) counts, hence a combined 49-bit high-resolution output. The ST block of the encoder consists of a patterned disk, a light source, and photosensitive elements to translate the mechanical motion into an electrical signal. The encoder is designed with a selection of serial communication protocols, with a dedicated electronic circuit designed for robust signal communication. Broadcom AR49 series encoders offer many intelligent features, such as Built-In Temperature Sensor, User Programmable Resolution, Zero Reset, System Alarm, and more. They come with a recommended high-temperature range of –40°C to 115°C. One of the key advantages is their multi-turn tracking, which employs a proprietary energy- harvesting (EH) technology by harvesting the magnetic energy while the patterned disk with magnet rotates. The counter ASIC harvests the energy generated by the EH sensor for processing the rotational count and generates counting logic to non-volatile memory, which updates and stores the count. The entire operation of energy generation, counting, and storage processing is completed with limited energy and a short duration; hence, the kit encoder is suited for both low- speed and high-speed measurement. Features and Benefits 24-bit energy-harvesting multi-turn and 25-bit optical single-turn Accuracy upon calibration of ±30 arc-seconds Encoder fault and status bits with CRC Integrated differential transceiver for the SSI/BiSS-C/ RS485 communication protocols Single-ended Serial Protocol Interface (SPI 4-wire option) Overall encoder outer diameter of Ø35 mm and maximum height of 17.5 mm 8K bits of user-accessible memory in EEPROM Immediate position detection on power-up; no battery or capacitor required for position detection during a power failure RoHS compliant
Applications
AC/DC servo motor feedback Medical and laboratory equipment Robotics Factory automation NOTE: The AR49 series encoders are not halogen-free products. CAUTION! This product is not specifically designed or manufactured for use in any specific devices. Customers are solely responsible for determining the suitability of the product for its intended application and solely liable for all loss, damage, expense, or liability in connection with such use. Contact Broadcom for further inquiry. AR49-M49M/M25S Series Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Product Specifications Table 1: Absolute Maximum Ratingsa a. Exposure to absolute maximum rating condi tions for extended periods can affect reliability. Stress greater than the absolute maximum rating can cause permanent damage to the device. Parameters Symbol Min. Max. Units Notes Storage Temperature T S –40 125 °C — Operating Temperatureb b. The maximum junction temperature of the PCB shall not exceed 125°C. Ta –40 115 °C — Supply Voltage V DD –0.3 6.5 V — Electrostatic Discharge Immunity, ESD — –8k +8k V Contact discharge — –12k +12k V Air discharge Electrical Fast Transient/Burst Immunity, EFT — –2k +2k V 5 minutes, 5 kHz Permissible Speedc c. The encoder works reliably up until this permissible speed. — — 12,000 RPM — Relative Humidity RH — 90 % T = 60°C (non-condensing) Single-Turn Resolution — 15 25 bit 15 to 25 bits Multi-Turn Resolution — 0 24 bit 12, 14, 16, 18, 20, 22, and 24 bits Transmission Length d d. A twisted-pair shielded cable is recommended for robustness agains t environmental noise. Frame ground (FG) termination near the motor frame is recommended. — — 25 meter SSI/BiSS-C/RS485 differential line Table 2: Electrical Characteristics DC characteristics over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. Parameters Symbol Min. Typ. Max. Unit Notes Supply Voltage V DD 4.5 5.0 5.5 V — Supply Current IDD 50 60 100 mA BiSS/SSI/SPI4 options
68 RS485 option (with oscillator)
Power on Standby — — — 500 ms — Protocol I/O Drive Strength I DIO 5 20 40 mA Differential driver Electrically Permissible Speed — –12,000 — +12,000 RPM — Differential Transceiver Hysteresis Voltage V hys — 100 — mV 220 Ω termination Opening Voltage V open 200 — — mV — Peak-Peak Voltage V PP —2—V — I/O Line (SPI Single-Ended) Output High Voltage V OH 4.4 — — V No load (V DD = 5V) Output Low Voltage V OL —— 0 . 5V — Input High Voltage V IH 2.8 — 5.5 V — Input Low Voltage V IL 0— 1 . 8 V —
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter CAUTION! Refrain from placing the code-wheel magnet or any magnet near the EH sensor on top of the encoder assembly (maintain a storage condition <20 mT). Figure 1: Counting Up Direction from Top View Table 3: Mechanical and Environmental Specifications Mechanical characteristics over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. Parameters Conditions Min. Typ. Max. Units Storage Temperature — –40 — 125 °C Operating Temperaturea a. Maximum junction temperature of the PCB shall not exceed 125°C. — –40 — 115 °C Encoder Accuracyb b. Typical values represent the accuracy and repeatability when calibrated with a reference encoder having 10× higher accuracy than the AR49. Reference encoder ≈ 3 arc-seconds. With reference encoder correction, Ta = 25°C — ±30 — Arc-sec Mechanical Permissible Speed — –12,000 — +12,000 RPM Relative Air Humidity (Non-Condensing) Ta = 60°C — 90 — RH% Vibration EN 60068-2-6 — — 30 G Shock EN 60068-2-27, 6 ms — — 100 G Table 4: General Encoder Specifications Parameters Notes Default Counting Direction Increases wit h counter-clockwise (CCW) code-wheel rotation; view from encoder top (Figure 1) User-Accessible Memory Size 8K bits Encoder Temperature 8-bit data output at 1°C resolution Initialization Time 500 ms Top View
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Mechanical Specifications Figure 2: MT Encoder Mechanical Dimensions NOTE: Dimensions are in millimeters. Third angle projection. Motor-shaft outer diameter requirement: 6g6 (–0.004, –0.012) mm. Horizontal Connector Vertical Connector Code-Wheel Assembly
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Figure 3: ST Encoder Mechanical Dimensions NOTE: Dimensions are in millimeters. Third angle projection. Motor-shaft outer diameter requirement: 6g6 (–0.004, –0.012) mm. Horizontal Connector Vertical Connector Code-Wheel Assembly
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Recommended Motor Mounting Dimensions Figure 4: Mounting Dimensions When Using the Module Outer Diameter (OD) as the Position Guide NOTE: Dimensions are in millimeters. Third angle projection. Use a stainless steel M3 screw to secure the code-wheel–hub assembly to the motor shaft. Use a screw with pre-applied thread locker. The motor-shaft end where the code wheel is mounted must be made of non-ferromagnetic material. Recommended motor-shaft material: SUS316L. Non-ferromagnetic material
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Figure 5: Mounting Dimensions When Using the Module Inner Diameter (ID) as the Position Guide NOTE: Dimensions are in millimeters. Third angle projection. Use a stainless steel M3 screw to secure the code-wheel–hub assembly to the motor shaft. Use a screw with pre-applied thread locker. The motor-shaft end where the code wheel is mounted must be made of non-ferromagnetic material. Recommended motor-shaft material: SUS316L. Non-ferromagnetic Material
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Interface Protocol AR49-M49M/M25S-Kxx with RS485 Half-Duplex Protocol A one-to-one half-duplex serial communication is established between the client encoder and the host (for example, a servo driver). The communication is in a differential transmission format. The encoder will perform specific operations based on the command requests made by the host. Before the encoder executes the requested operation, an acknowledgment of the command request is necessary after first checking the start bit, information data field, and stop bit. If this check fails, the encoder will not acknowledge and execute the received command request. Figure 8: General Transmission Frames Format on Half-Duplex Line NOTE: Start of transmission frames set: Upon detecting the first logic of Low State "0" on the transmission line after an idle state, and if the following three bits conform to the sync code, the encoder will acknowledge it as a valid Request Control Field (RCF), which indicates the start of a transmission frame set. Otherwise, the encoder will continue to search for the next available logic of Low State "0". End of transmission frames set: After the command frame is detected, if there is no start bit after the end bit of the last frame read, and no subsequent frame is detected, the end of transmission frames set is concluded. Idle state: The idle state means a space between each transmission frames set and subsequent transmission frames. At the idle state, the logic of the output in the transmission line is kept to high state "1". Table 5: RS485 Protocol Specifications Over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. Parameters Conditions Min. Typ. Max. Unit Notes Communication Baud Rate — — 2.5 10 Mb/s 2.5, 5, 10 Mb/s Frame Length — — 10 — Bit/Frame — Cycle Time Between Frames Set Request Command ID3 62.5 — — μs 2.5 Mb/s 35 — — — 5 Mb/s 20 — — — 10 Mb/s Jitter Every Frame –100 — 100 ns 2.5 Mb/s –50 — 50 ns 5 Mb/s –25 — 25 ns 10 Mb/s IDLE IDLE RCF CF SF DF0 CRC Host Request Frames Set H o s t Transmission Frame (Host Request) Transmission Frames Set (Client Encoder Response) Data Frames
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter RS485 Differential Connection The recommended I/O connection between the encoder and the host driver has the following basic requirements: 1. Ensure that the encoder power supply, V CC, is within the range of 4.5V to 5.5V. 2. For best noise immunity, use a twisted-pair shie lded cable for connection to the servo driver. 3. To prevent undesirable signal reflection, terminate with 220 Ω resistors. 4. Terminate the shield-wire to frame ground (FG) at both ends of the communication line. Figure 9: RS485 Half-Duplex I/O Connection ControllerEncoder DATA+ DATA- 220ё GND FG RO DI DE /RE D RGND B/Z A/Y 0.1uF 1.2kё 1.2kё 220ё GND B/Z A/Y 1.2kё 1.2kё FG GND Vcc Vcc (5V) GND
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter AR49-M49M/M25S-Bxx with BiSS-C Serial Interface Figure 10: BiSS-C Data Field and Interface Timing Diagram NOTE: CRC polynomial = Invert of (X6 + X1 + X0). The nErr bit is active low. (Combines all the Error Status and reflects in the nErr bit). The nWar bit is active low. (Combines all the Warning Status and reflects in the nWar bit). The position data varies depending on the single-turn and multi-turn resolution. The recommended I/O connection between the encoder and the host driver has the following basic requirements. Table 6: BiSS-C Timing Characteristics Over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. Parameters Symbol Condition Min. Typ. Max. Units MA Frequency f MA —0 . 0 8 — 1 0 M H z MA Duty DUT CLK —— 5 0 — % Busy Time Tbusy fMA = 5 MHz to 10 MHz — 2/f MA — μs100 kHz ≤ fMA < 5 MHz — 1/f MA — Timeout t BiSS-timeout — 1.5/f MA —5 μs Frame to Frame — — — — 1 μs Position Data npos bits + 1 nErr bit + 1 nWar bit + 6 bits CRC (npos bits) (6bits) (1bit) (1bit) (1bit) (1bit) CRC Position data Position data Bits (n pos-1) … 0 MSB … LSB CRC Bits 5 … 0 MSB … LSB T SLO Ack Start CDS nErr nWar Timeout TBiSS-timeout Tbusy MA CDM(invert) MT[23:0] ST[24:0] Error[0] Warning[0] CRC[5:0]
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter BiSS-C Full-Duplex Connection 1. Provide the following encoder power supply: – For the 5.0V supply, V CC should be within the range of 4.5V to 5.5V. 2. For best noise immunity, use a twisted-pair shie lded cable for connection to the servo driver. 3. To prevent undesirable signal reflection, terminate with 120 Ω resistors. 4. Terminate the shield-wire to frame ground (FG) at both ends of the communication line. Figure 11: BiSS-C Full-Duplex I/O Connection
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter AR49-M49M/M25S-Sxx with SSI 2-Wire Serial Interface Figure 12: SSI Data Field and Timing Diagram For the SSI option, the encoder calibration and device configuration are achieved by switching to the SPI mode during calibration. By toggling the logic levels of the SEL0 and SEL1 pins, the SPI calibration mode can be enabled. Table 7: SSI Protocol Specifications Over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. SSI Communication Parameters Symbol Conditions Min. Typ. Max. Unit Clock Frequency f CLK — 100 — 10,000 kHz Clock Duty DUT CLK ——5 0—% Monoflop Time t m ———2 0 μs Pause Time t p —2 1—— μs SCLK DATA MT[23:0] ST[24:0] nError[0] nWarning[0] 24 bits 25 bits 1 bit 1 bit
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter SSI 2-Wire Full-Duplex Connection 1. Provide the following encoder power supply: – For the 5.0V supply, V CC should be within the range of 4.5V to 5.5V. 2. For best noise immunity, use a twisted-pair shie lded cable for connection to the servo driver. 3. To prevent undesirable signal reflection, terminate with 120 Ω resistor. 4. Terminate the shield-wire to frame ground (FG) at both ends of the communication line. Figure 13: SSI Full-Duplex Connection
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter AR49-M49M/M25S-Pxx with SPI 4-Wire Protocol Figure 14: SPI Timing Diagram NOTE: The user should read back data to confirm that data has been written successfully. Table 8: SPI Protocol Specifications Over the recommended operating conditions of VDD 4.5V to 5.5V, Ta = –40°C to 115°C. Symbol Description Min. Typ. Max. Units tL Time between the NCS falling edge and the CLK rising edge 350 — — ns tclk Serial clock period 100 — — ns tclkL Low period of the serial clock 50 — — ns tclkH High period of the serial clock 50 — — ns tH Time between the last falling edge of SCK and the rising edge of NCS t clk/2 — — ns tNCS High time of NCS between two transmissions 350 — — ns tMOSI Data input valid to the clock edge 20 — — ns tMISO SCK edge to the data output valid — 51 — ns tOZ Time between the NCS rising edge and the MISO Hi-Z — 10 — ns
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Connector Information Figure 15: Horizontal and Vertical Connector Information Table 9: Recommended Connector Information Part Location Manufacturer Part Number Description Header On PCB JST SM08B-SRSS-TB Horizontal/radial connector JST BM08B-SRSS-TB Vertical/axial connector Wire Plug Mating plug for wires JST SHR-08V-S — Crimp Pins Crimp pins for wires JST SSH-003T-P0.2 -H Terminal pin fo r wire 32~28 AWG Table 10: Encoder Pinout Description Pin # BiSS-C SPI SSI a, b a. The SSI option is configured via the s hared SPI pins and setting the correct logic level for the SEL0 and SEL1 pins. b. For the SSI option, when switching to communicate with the SPI protocol, Pin 3 and Pin 4 of the SPI-NCS and SPI-CLK lines require a strong driver current due to the SSI SCLK+/SCLK- terminating resistor. It is recommended to be achieved with a level shifter or a line driver circuit. RS485 1 +5V +5V +5V +5V 2 0 V0 V0 V0 V
3 MA+ SPI-NCS SCLK+/SPI-NCS NC
4 MA- SPI-CLK SCLK-/SPI-CLK NC
5 SLO+ SPI-DO/MISO DATA+/SPI-DO/MISO DATA+
6 SLO- SPI-DIN/MOSI DATA-/SPI-DIN/MOSI DATA-
7 NC NC SEL0 NC
8 NC NC SEL1 NC
Broadcom AR49-M49M-M25S-DS101 AR49-M49M/M25S Series Data Sheet Absolute Reflective Encoder Module with Energy-Harvesting Multi-Turn Counter Part Numbering Figure 16: AR49 Module Encoder Part Number Definition Table 11: Encoder Ordering Information No. Multi-Turn Part Number Description 1 AR49-M49M-S12V 49-Bit MT, Differential SSI, 6-mm S haft, M3 Mounting Screw, Vertical Connector. 2 AR49-M49M-P12V 49-Bit MT, Single-Ende d SPI 4-Wire, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 3 AR49-M49M-K12V 49-Bit MT, Differential RS485, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 4 AR49-M49M-B12V 49-Bit MT, Different ial BiSS-C, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 5 AR49-M49M-S12H 49-Bit MT, Differential SSI, 6-mm Shaf t, M3 Mounting Screw, Horizontal Connector. 6 AR49-M49M-P12H 49-Bit MT, Single-Ende d SPI 4-Wire, 6-mm Shaft, M3 Mounting Screw, Horizontal Connector. 7 AR49-M49M-K12H 49-Bit MT, Differential RS485, 6-mm Sh aft, M3 Mounting Screw, Horizontal Connector. 8 AR49-M49M-B12H 49-Bit MT, Differentia l BiSS-C, 6-mm Shaft, M3 Mounting Screw, Horizontal Connector. No. Single-Turn Part Number Description 9 AR49-M25S-S12V 25-Bit ST, Differential SSI, 6-mm S haft, M3 Mounting Screw, Vertical Connector. 10 AR49-M25S-P12V 25-Bit ST, Single-Ende d SPI 4-Wire, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 11 AR49-M25S-K12V 25-Bit ST, Differential RS485, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 12 AR49-M25S-B12V 25-Bit ST, Differential BiSS-C, 6-mm Shaft, M3 Mounting Screw, Vertical Connector. 13 AR49-M25S-S12H 25-Bit ST, Differential SSI, 6-mm S haft, M3 Mounting Screw, Horizontal Connector. 14 AR49-M25S-P12H 25-Bit ST, Single-Ende d SPI 4-Wire, 6-mm Shaft, M3 Mounting Screw, Horizontal Connector. 15 AR49-M25S-K12H 25-Bit ST, Differential RS485, 6-mm Sh aft, M3 Mounting Screw, Horizontal Connector. 16 AR49-M25S-B12H 25-Bit ST, Differential BiSS-C, 6-mm Shaft, M3 Mounting Screw, Horizontal Connector. Table 12: Accessories Ordering Information No. Part Number Description 1 AS20-C300 8-pin mating co nnector with 300-mm cable length. 2 AR49-M49-E01 Programming Kit (applicable for all protocol options). Contents: 1 unit of MCU-based programming kit, 1 unit of USB cable for the PC interface, the DUT cable, and the associated programming software. 3 AR25-AC25 Accuracy Calibration Station for t he AR25/AR49 Series Rotary Reflective Encoder. Contents: Mechanical setup including the servo motor control, high-accuracy reference encoder, programming kits, associated cable assemblies (for the PC interface, motor handler communication, DUT encoder connection), and the associated GUI programming software. A R49ࡳM4 9 MࡳX 1 2 H Resolution Output Type Protocol Hub ID Connector 49 49 Bits (ST+MT) M Multi-Turn B BiSS-C 12 6m m H Horizontal 25 25 Bits (ST) S Single-Turn S SSI V Vertical P SPI K RS485
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