AS5040_09 datasheet(2/34 Pages) AMSCO

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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

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

AS5040

10Bit 360° Programmable Magnetic Rotary Encoder

Data Sheet

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