AS5045 12-BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER

Revision 1.0, 11-Jan-06 www.austriamicrosystems.com Page 1 of 24
1 General 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

Figure 1: Typical arrangement of AS5045 and magnet

1.1 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
1.2 Key Features
- Contactless high resolution rotational position
encoding over a full turn of 360 degrees
- Two digital 12bit absolute outputs:
- Serial interface and
- 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 airgap
variations
- Wide temperature range: - 40°C to + 125°C
- Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)

1.3 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





This product is covered by one or more pending European and U.S. patents
DATA SHEET
AS5045
12 BIT PROGRAMMABLE MAGNETIC ROTARY ENCODER