True Zero-Speed, High Accuracy Gear Tooth Sensor IC


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The ATS667 is a true zero-speed gear tooth sensor IC consisting of an optimized Hall IC-rare earth pellet configuration in a single overmolded package. The unique IC and package design provides a user-friendly solution for digital gear tooth sensing applications. This small package can be assembled simply and used in conjunction with gears of various shapes and sizes.

The device incorporates a dual element Hall IC that switches in response to differential magnetic signals created by a ferromagnetic target. The IC contains a sophisticated compensating circuit designed to eliminate the detrimental effects of magnet and system offsets. Digital processing of the analog signal provides zero-speed performance independent of air gap and also dynamic adaptation of device performance to the typical operating conditions found in automotive applications (reduced vibration sensitivity). High-resolution peak detecting DACs are used to set the adaptive switching thresholds of the device. Hysteresis in the thresholds reduces the negative effects of any anomalies in the magnetic signal associated with the targets used in many automotive applications.

The ATS667 is optimized for transmission applications. It is available in a lead (Pb) free 4-pin SIP package with a 100% matte tin plated leadframe.

  • Optimized robustness against magnetic offset variation
  • Small signal lockout for immunity against vibration
  • Tight duty cycle and timing accuracy over full operating temperature range
  • True zero-speed operation
  • Air gap independent switchpoints
  • Large operating air gaps achieved through use of gain adjust and offset adjust circuitry
  • Defined power-on state (POS)
  • Wide operating voltage range
  • Digital output representing target profile
  • Single chip sensing IC for high reliability
  • Small mechanical size
  • Optimized Hall IC magnetic system
  • Fast start-up
  • Undervoltage lockout (UVLO)

The ATS667 is available in a lead (Pb) free 4-pin (suffix SG) SIP package with a 100% matte tin plated leadframe. 

SG Package Documentation

Part Number Specifications and Availability

Documentation and Resources


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Documents Found: 32
Document Type Document Name
Application Note
Transmission Gear Tooth Sensing
Application Note
Fundamental Properties of Speed Sensors