General Description
The AS5040 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.
Benefits
⪠Complete system-on-chip
⪠Flexible system solution provides absolute,
PWM and incremental outputs simultaneously
⪠Ideal for applications in harsh environments
due to contactless position sensing
⪠Tolerant to magnet misalignment and airgap
variations
⪠No temperature compensation necessary
⪠No calibration required
Key Features
⪠Contactless high resolution rotational position
encoding over a full turn of 360 degrees
⪠Two digital 10bit absolute outputs:
- Serial interface and
- Pulse width modulated (PWM) output
⪠Three incremental output modes:
- Quadrature A/B and Index output signal
- Step / Direction and Index output signal
- 3-phase commutation for brushless DC
motors
- 10, 9, 8 or 7 bit user programmable
resolution
⪠User programmable zero / index position
⪠Failure detection mode for magnet placement
monitoring and loss of power supply
⪠Rotational speeds up to 30,000 rpm
⪠Push button functionality detects movement
of magnet in Z-axis
⪠Serial read-out of multiple interconnected
AS5040 devices using Daisy Chain mode
⪠Wide temperature range: - 40°C to + 125°C
⪠Fully automotive qualified to AEC-Q100,
grade 1
⪠Small Pb-free package: SSOP 16 (5.3mm x 6.2mm)
Applications
⪠Industrial applications:
- Contactless rotary position sensing
- Robotics
- Brushless DC motor commutation
- Power tools
⪠Automotive applications:
- Steering wheel position sensing
- Gas pedal position sensing
- Transmission gearbox encoder
- Headlight position control
- Power seat position indicator
⪠Office equipment: printers, scanners, copiers
⪠Replacement of optical encoders
⪠Front panel rotary switches
⪠Replacement of potentiometers
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