ATS601 Single-Element, Tooth-Detecting Speed Senso

By Allegro MicroSystems, LLC 66

ATS601 Single-Element, Tooth-Detecting Speed Senso

The ATS601LSG is a unique addition to Allegro's camshaft sensor family of products. As a single-element, non-TPOS sensor it provides first falling edge detection, high-accuracy running-mode edge accuracy, and direction/orientation insensitivity over the full operating range of air gap, speed, and temperature. The ATS601LSG is a true zero-speed gear-tooth sensor IC consisting of an optimized Hall IC and simple magnetic pellet configuration ideal for phased cam, start/stop engine applications. It is also ideal for industrial, consumer, and computer (IC and C) applications such as motorcycles, golf carts, and industrial equipment.

The single-element Hall IC and magnet configuration switches in response to magnetic signals created by a ferrous target. The IC contains a low bandwidth filter that increases the noise immunity and the signal-to-noise ratio of the sensor. Sophisticated digital circuit design eliminates the detrimental effects of target geometry discontinuity, magnet and system offsets, and thermal gradients. Signal processing is used to provide zero-speed performance independent of air gap and also to dynamically adapt device performance to the typical operating conditions found in automotive applications, particularly camshaft sensing.

A programmable number of target teeth allow learning of the target profile and optimization of switching thresholds, ensuring high accuracy, even with target eccentricity. An internal hidden hysteresis in the thresholds reduces the negative effects of anomalies in the magnetic signal. The resulting output of the device is a digital representation of the ferrous target profile.

  • Digital output representing target profile
  • Single Hall element for twist-insensitive mounting
  • Direction-insensitive polarity
  • True zero-speed operation
  • First falling edge detection
  • Camshaft applications that do not require TPOS
  • Motorcycles
  • Golf carts
  • Industrial equipment