ATS128: Highly Programmable, Back-Biased, Hall-Effect Switch with TPOS Functionality

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Top Features

The ATS128LSE programmable, true power-on state (TPOS), sensor IC is an optimized combination of Hall-effect IC and rare-earth pellet that switches in response to magnetic signals created by ferromagnetic targets in gear-tooth sensing and proximity sensing applications.

These devices offer a wide programming range for the magnetic operate point, BOP. A fixed hysteresis then sets the magnetic release point, BRP, based on the selected BOP.

The devices are externally programmable. A wide range of programmability is available on the magnetic operate point, BOP, while the hysteresis remains fixed. This advanced feature allows optimization of the sensor IC switchpoint and can drastically reduce the effects of mechanical placement tolerances found in production environments.

A proprietary dynamic offset cancellation technique, with an internal high-frequency clock, reduces the residual offset voltage, which is normally caused by device overmolding, temperature dependencies, and thermal stress. Having the Hall element and amplifier in a single chip minimizes many problems normally associated with low-level analog signals.

This device is ideal for use in gathering speed or position information using gear-tooth–based configurations, or for proximity sensing with ferromagnetic targets.

The ATS128 is provided in a 4-pin SIP. It is lead (Pb) free, with 100% matte tin leadframe plating.

  • Chopper stabilization for stable switchpoints throughout operating temperature range
  • User-programmable:
    • Magnetic operate point through the VCC pin:
      9 programming bits provide 4-gauss resolution
    • Output polarity
    • Output fall time for reduced EMI in automotive applications
  • On-board voltage regulator for 3 to 24 V operation
  • On-chip protection against:
    • Supply transients
    • Output short-circuits
    • Reverse battery condition
  • True Zero-Speed Operation
  • True Power-On State

Typical Applications

  • Camshaft

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Part Composition /
RoHS Data
Comments Samples Check Stock
ATS128LSETN-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.