Overview: AR25
Smart Programmable 25-Bit Reflective Absolute Single-Turn Encoder Data Sheet Overview
The Broadcom® AR25 is a miniature absolute encoder ASIC that is designed to cater to the growing demand for space-constraint applications. Employing the advanced reflective optical-encoding theory, the AR25 Series offer high position accuracy with a correction algorithm, which is unattainable by magnetic encoders.
The AR25 encoder is a one-chip solution that has the flexibility to cater to variable overall diameters, ranging from 30 mm to 60 mm. The AR25 also supports through-hole solutions up to 30 mm in diameter. User-programmable resolutions are from 15-bit to 25-bit single-turn absolute outputs. In addition, the AR25 also provides differential analog sine/cosine or digital incremental ABIUVW signals with configurable CPRs and pole-pairs. The AR25 also comes with a state-of-the-art Auto-Calibration feature that eases customer’s integration into their end systems.
The AR25 Series also supports integration with the Broadcom proprietary battery-less Energy Harvesting MultiTurn (EHMT) solution. Alternatively, other multi-turn solutions like gear-based and battery backup are also supported by a dedicated MT interface port.
For power supply, the ASIC supports dual-mode operating voltages of either 3.3V or 5V, which are suitable for handheld and portable device applications. The operating temperature range is –40°C to 125°C, suitable for most industrial applications.
To enhance the user system-design flexibility, the AR25 offers various protocols that are selectable by the user. Among the available protocols are the Encoder Serial Link (ESL) or RS485 half-duplex protocol, SSI, BiSS-C, and SPI 4-wire.
