ALLEGRO A17502POKATN-SDFUYJE

The A17502 is a single IC solution designed for rotational position sensing of a ring magnet target found in automotive and industrial electric motor applications (often with specific application and safety requirements). Three Hall elements are incorporated to create two independent differential channels. These inputs are processed by digital circuits and robust algorithms designed to eliminate the detrimental effects of magnetic and system offsets, and to address false output transitions caused by target vibrations in electric motors at startup and low speed operation. The differential signals are used to produce a highly accurate speed output and, if desired, provide information on the direction of rotation. Advanced calibration techniques are used to optimize signal offset and amplitude. This calibration, combined with the digital tracking of the signal, results in accurate switch points over air gap, speed, and temperature. The IC can be programmed for a variety of applications requiring dual-phase target speed and position signal information or simultaneous high-resolution target speed and direction information. It can be configured to enable Fault Detection mode for ASIL B(D) utilization (assessment pending). The A17502 K package is a lead (Pb) free 4-pin SIP package with a 100% matte-tin-plated lead frame. The A17502 supports three Hall elements that sense the magnetic profile of the ring magnet target simultaneously but at different points (each channel spaced at 1.1 mm pitch), generating two differential internal signals processed for precise switching of the digital output signals. Direction of rotation can be determined based on the phase relationship of the two differential internal signals. The A17502 is intended for use with ring magnet targets, or ferromagnetic targets when properly back-biased. The Hall-effect sensor IC is self-calibrating and possesses a temperature compensated amplifier as well as a full-range analog-to-digital converter (ADC). This allows for accurate processing of a wide range of target magnetic profile amplitudes and offsets. The on-chip voltage regulator provides supply noise rejection throughout the operating voltage range. Changes in temperature do not greatly affect the A17502 due to the

• Ideally suited for xEV asynchronous electric motor applications with narrow pitch targets
• High-speed switching bandwidth up to 40 kHz
• Two independent output channels for either speed and direction or AB outputs in quadrature
• ASIL B(D) compliant (ISO 26262), assessment pending, with optional fault detection output protocol
• Differential sensing for robustness to external magnetic disturbance
• EEPROM enabled factory traceability throughout product lifecycle
• Also available with integrated magnet (see ATS17502 datasheet)