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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