AS5040_1 Datasheet, PDF (1/33 Pages) ams AG – 10Bit 360 Programmable Magnetic Rotary Encoder

AS5040
10Bit 360° Programmable Magnetic Rotary Encoder
Data Sheet
1 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.
The absolute angle measurement provides instant
indication of the magnet’s angular position with a
resolution of 0.35° = 1024 positions per revolution. This
digital data is available as a serial bit stream and as a
PWM signal.
Furthermore, a user-programmable incremental output
is available, making the chip suitable for replacement of
various optical encoders.
An internal voltage regulator allows the AS5040 to
operate at either 3.3 V or 5 V supplies.
Figure 1: Typical Arrangement of AS5040 and Magnet
Benefits
ƒ Complete system-on-chip
ƒ Flexible system solution provides absolute,
PWM and incremental outputs simultaneously
ƒ Ideal for applications in harsh environments
due to contactless position sensing
ƒ Tolerant to magnet misalignment and airgap
variations
ƒ No temperature compensation necessary
ƒ No calibration required
2 Key Features
ƒ Contactless high resolution rotational position
encoding over a full turn of 360 degrees
ƒ Two digital 10bit absolute outputs:
- Serial interface and
- Pulse width modulated (PWM) output
ƒ 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
ƒ User programmable zero / index position
ƒ Failure detection mode for magnet placement
monitoring and loss of power supply
ƒ Rotational speeds up to 30,000 rpm
ƒ Push button functionality detects movement
of magnet in Z-axis
ƒ Serial read-out of multiple interconnected
AS5040 devices using Daisy Chain mode
ƒ Wide temperature range: - 40°C to + 125°C
ƒ Fully automotive qualified to AEC-Q100,
grade 1
ƒ Small Pb-free package: SSOP 16 (5.3mm x
6.2mm)
3 Applications
ƒ Industrial applications:
- Contactless rotary position sensing
- Robotics
- Brushless DC motor commutation
- Power tools
ƒ Automotive applications:
- Steering wheel position sensing
- Gas pedal position sensing
- Transmission gearbox encoder
- Headlight position control
- Power seat position indicator
ƒ Office equipment: printers, scanners, copiers
ƒ Replacement of optical encoders
ƒ Front panel rotary switches
ƒ Replacement of potentiometers
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