Broadcom AR25 Smart Programmable 25-Bit Reflective Absolute Single-Turn Encoder
The Broadcom AR25 is a miniature absolute encoder ASIC designed for space-constrained applications. Utilizing advanced reflective optical-encoding theory, it offers high position accuracy with a correction algorithm superior to magnetic encoders. This one-chip solution supports variable overall diameters (30 mm to 60 mm) and through-hole solutions up to 30 mm. It provides user-programmable resolutions from 15-bit to 25-bit single-turn absolute outputs, as well as differential analog sine/cosine or digital incremental ABIUVW signals with configurable CPRs and pole-pairs. The AR25 features Auto-Calibration for simplified integration and supports integration with Broadcom's proprietary battery-less Energy Harvesting Multi-Turn (EHMT) solution, or other multi-turn solutions via a dedicated MT interface port. It operates on dual-mode 3.3V or 5V power supplies, suitable for handheld and portable devices, with an operating temperature range of 40C to 125C for industrial applications. The AR25 offers selectable communication protocols including Encoder Serial Link (ESL), RS485, SSI, BiSS-C, and SPI 4-wire.
Product Attributes
- Brand: Broadcom
- Product Series: AR25
- Certifications: RoHS compliance
Technical Specifications
| Parameter | Symbol | Min. | Typ. | Max. | Unit | Notes |
|---|---|---|---|---|---|---|
| Absolute Maximum Ratings | ||||||
| Storage Temperature | TS | 40 | 125 | C | ||
| Operating Temperature | TA | 40 | 125 | C | ||
| Supply Voltage | Vdd | 7 | V | |||
| ESD (HBM), JS-001-2014 | 2 | kV | ||||
| Moisture Sensitive Level | MSL | 3 | (Maximum floor life = 168h) | |||
| Recommended Operating Conditions | ||||||
| DC Supply Voltage (5V) | Vdd | 4.5 | 5.0 | 5.5 | V | |
| DC Supply Voltage (3.3V) | Vdd | 3.0 | 3.3 | 3.6 | V | |
| Ripple of Supply Voltage | 100 | mVpp | 100 kHz | |||
| Output Current per Channel | 5 | mA | ||||
| Single-ended Rise Time | tr | 30 | ns | CL = 50 pF RL = 1.2 k | ||
| Single-ended Fall Time | tf | 30 | ns | CL = 50 pF RL = 1.2 k | ||
| Ambient Temperature | Tamb | +25 | C | |||
| Operational Temperature (PCB) | TPCB | 40 | +25 | +125 | C | PCB (FR4-4 layers) temperature |
| Storage Temperature | TS | 40 | +25 | +125 | C | |
| Humidity | RH | 85 | % | Temperature = 40C | ||
| INC Operating Frequency | 128 | kHz | Velocity (rpm) CPR/60 | |||
| Encoder Shaft Speed | SRPM | 15,000 | rpm | 512 CPR (AR25) | ||
| Temperature Sensor Accuracy | 3 | C | At 125C | |||
| DC Characteristics | ||||||
| VDD Supply Current (3.3V) | IDD | 65 | mA | |||
| VDD Supply Current (5.0V) | IDD | 65 | mA | |||
| Absolute Single-Turn Resolution | STbits | 15 | 25 | bit | a. Maximum number of bits able to be set in the AR25. | |
| Incremental Resolution | 20 | 2nmax CPR | nmax = 20 | |||
| Protocol I/O Drive Strength | IDIO | 5 | 20 | 40 | mA | VDD = 3.3V/5V, Differential driver |
| Differential Transceiver Hysteresis | Vhys | 100 | mV | VDD = 3.3V/5V, 220 termination | ||
| Differential Transceiver Opening | Vopen | 200 | mV | VDD = 3.3V/5V | ||
| Differential Transceiver Voltage Peak-to-Peak | VPP | 2 | V | VDD = 3.3V/5V | ||
| Output High Voltage (3.3V) | VOH | 2.4 | 3.3 | 3.6 | V | No load |
| Output Low Voltage (3.3V) | VOL | 0 | 0.4 | V | No load | |
| Input High Voltage (3.3V) | VIH | 2 | 3.6 | V | ||
| Input Low Voltage (3.3V) | VIL | 0 | 1.4 | V | ||
| Output High Voltage (5.0V) | VOH | 4.4 | 5 | 5.5 | V | No load |
Applications
- Robotic automation and engineering
- Factory automation and drone
- Medical and dentistry devices and equipment
- High-accuracy portable and handheld devices
- Miniature motor, servo motor, and linear actuator
- Through-shaft motor, gear motor, and speed reducer
2510211446_Broadcom-AR25-AS01_C42962483.pdf
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