Two-Wire, Differential, Vibration-Resistant Sensor IC with Speed and Direction Output


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The ATS699LSN is an optimized Hall-effect integrated circuit (IC) and rare-earth pellet combination that provides a user friendly solution for direction detection and true zero-speed, digital gear-tooth sensing. The small package can be easily assembled and used in conjunction with a wide variety of gear-tooth-sensing applications.

The IC employs patented algorithms for the special operational requirements of automotive transmission applications. The speed and direction of the target are communicated through a variable pulse-width output protocol. The ATS699 is particularly adept at handling vibration without sacrificing maximum air gap capability or creating any erroneous “direction” pulses. The advanced vibration detection algorithm will systematically calibrate the sensor IC on the initial teeth of true target rotation and not on vibration, always guaranteeing an accurate signal in running mode.

Advanced signal processing and innovative algorithms make the ATS699 an ideal solution for a wide range of speed and direction-sensing needs.

This device is available in a lead (Pb) free 3-pin SIP package with tin-plated leadframe.

Featured Video:

Differential Speed Sensor System Solutions

Differential Speed Sensor System Solutions

Seth Prentice, Strategic Marketing Manager for Allegro MicroSystems Speed Sensor IC group, discusses IC solutions for designing speed sensing applications including automotive transmissions, washing machine drum speeds, and fork lift positioning requiring reliable consistent output signals. Watch Video

  • Integrated capacitor reduces requirements for external EMI-protection components
  • Two-wire, pulse-width output protocol
  • Highly configurable output protocol options
  • Speed and direction information of target
  • Vibration tolerance
    • Small signal lockout for small amplitude vibration
    • Proprietary vibration detection algorithms for large amplitude vibration
  • Air-gap-independent switchpoints
  • Undervoltage lockout
  • True zero-speed operation
  • Wide operating voltage range
  • Single chip sensing IC for high reliability
  • Robust test-coverage capability with Scan Path and IDDQ measurement
  • Integrated back-biasing magnet

This device is available in a lead (Pb) free 3-pin (suffix SN) SIP package with tin-plated leadframe.

SN Package Documentation

Part Number Specifications and Availability

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Application Note
Fundamental Properties of Speed Sensors