ATS17501: Dual Output Differential Speed and Direction Sensor IC

The ATS17501 is a single IC solution designed for rotational position sensing of a ferrous gear target found in automotive and industrial electric motor applications (often with specific application and safety requirements). The IC is housed in an SG package that incorporates a rare-earth magnetic pellet for ease of manufacturing, consistent application performance over temperature, and enhanced reliability.

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 gear speed and position signal information or simultaneous high-resolution gear speed and direction information. It can be configured to enable Fault Detection mode for ASIL B(D) utilization (assessment pending).

The ATS17501 SG package is a lead (Pb) free 4-pin SIP package with an integrated back-biasing magnet and a 100% matte-tin-plated lead frame.

• High-speed switching bandwidth up to 40 kHz


• Two independent output channels with options for high resolution XOR speed, pulse, and direction protocol


• ASIL B(D) compliant (ISO 26262), assessment pending


• Optional fault detection output protocol


• Immune to common external magnetic disturbance


• EEPROM enables factory traceability throughout product life cycle