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