ATS616: Dynamic Self-Calibrating Peak-Detecting Differential Hall Effect Gear Tooth Sensor IC


The ATS616 gear-tooth sensor IC is a peak-detecting device that uses automatic gain control and an integrated capacitor to provide extremely accurate gear edge detection down to low operating speeds. Each package consists of a high-temperature plastic shell that holds together a samarium-cobalt pellet, a pole piece, and a differential open-collector Hall IC that has been optimized to the magnetic circuit. This small package can be assembled simply and used in conjunction with a wide variety of gear shapes and sizes.

The technology used for this circuit is Hall-effect based. The chip incorporates a dual-element Hall IC that switches in response to differential magnetic signals created by ferromagnetic targets. The sophisticated processing circuitry contains an A-to-D converter that self-calibrates (normalizes) the internal gain of the device to minimize the effect of air-gap variations. The patented peak-detecting filter circuit eliminates magnet and system offsets and has the ability to discriminate relatively fast changes such as those caused by tilt, gear wobble, and eccentricities. This easy-to-integrate solution provides first-tooth detection and stable operation to extremely low rpm. The ATS616 can be used as a replacement for the ATS612LSB, eliminating the external peak-holding capacitor needed by the ATS612LSB.

The ATS616 is ideal for use in systems that gather speed, position, and timing information using gear-tooth-based configurations. This device is particularly suited to those applications that require extremely accurate duty cycle control or accurate edge-detection, such as automotive camshaft sensing.

Top Features

  • Self-calibrating for tight timing accuracy
  • First-tooth detection
  • Immunity to air gap variation and system offsets
  • Eliminates effects of signature tooth offsets
  • Integrated capacitor provides analog peak and valley information
  • Extremely low timing-accuracy drift with temperature changes
  • Large air gap capability
  • Small, integrated package
  • Optimized magnetic circuit
  • Undervoltage lockout (UVLO)
  • Wide operating voltage range

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ATS616LSGTN-T 4-lead SIP -40°C to 150°C Yes View Data Contact your
local sales rep
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.


The ATS616 is provided in a 4-pin SIP that is Pb (lead) free, with a 100% matte tin plated leadframe (suffix SG).

SG SIP 4 pin