Dual Output Differential Speed and Direction Sensor IC


Allegro MicroSystems K Package (4-Pin SIP)


Top Features


The A17501 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.

  • High-speed switching bandwidth up to 40 kHz
  • Two independent output channels with options for high resolution XOR speed, pulse, and direction protocol
  • Optional fault detection output protocol
  • Immune to common external magnetic disturbance 
  • EEPROM enables factory traceability throughout product life cycle
  • Ideally suited for asynchronous electric motor applications

4-Pin SIP (suffix K)

K stp Model Documentation

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