AS5045
12 Bit Programmable
Magnetic Rotary Encoder
Description:
The AS5045 is a contactless magnetic rotary encoder for accurate angular measurement
over a full turn of 360°. It is a system-on-chip, combining integrated Hall
elements, analog front end and digital signal processing in a single device. To
measure the angle, only a simple two-pole magnet, rotating over the center of
the chip, is required. The magnet may be placed above or below the IC. The
absolute angle measurement provides instant indication of the magnet’s angular
position with a resolution of 0.0879° = 4096 positions per revolution. This
digital data is available as a serial bit stream and as a PWM signal. An
internal voltage regulator allows the AS5045 to
operate at either 3.3 V or 5 V supplies.
Benefits
- Complete system-on-chip
- Flexible system solution provides absolute and PWM outputs
simultaneously
- Ideal for applications in harsh environments due to
contactless position sensing
- No calibration required
Key Features
- Contact-less high resolution rotational position
- Encoding over a full turn of 360 degrees
- Two digital 12bit absolute outputs:
- - Serial interface
- - Pulse width modulated (PWM) output
- User programmable zero position
- Failure detection mode for magnet placement monitoring and
loss of power supply
- red-yellow-green” indicators display placement of magnet in
Z-axis
- Serial read-out of multiple interconnected AS5045 devices
using Daisy Chain mode
- Tolerant to magnet misalignment and air gap variations
- Wide temperature range: - 40°C to + 125°C
- Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)
Applications
- Industrial applications:
- - Contactless rotary position sensing
- - Robotics
- Automotive applications:
- - Steering wheel position sensing
- - Transmission gearbox encoder
- - Headlight position control
- - Torque sensing
- - Valve position sensing
- Replacement of high end potentiometers
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