A1698: Two-Wire, True Zero Speed, High Accuracy Sensor IC with Speed and Direction Output

Allegro 2-Pin SIP UB Package


Top Features


The A1698 is a Hall-effect based, integrated circuit (IC) that provides a user-friendly solution for two-wire, speed sensing of ring magnets or ferrous targets (when back-biased by the user) down to zero-speed in applications where speed and direction is required. The A1698 is offered in the UB package, which integrates the IC and a high temperature ceramic capacitor in a single overmolded SIP package. The integrated capacitor provides enhanced EMC performance.

The integrated circuit incorporates Hall-effect circuits and signal processing that switches in response to differential magnetic signals created by magnetic encoders, or, when properly back-biased with a magnet, from ferromagnetic targets. The circuitry contains a sophisticated digital circuit that reduces magnet and system offsets, calibrates the gain for air gap independent switch points, and provides true zero-speed operation.

The regulated current output is configured for two-wire interface circuitry and is ideally suited for obtaining speed and direction information in wheel speed applications. The 2-pin SIP package is lead (Pb) free, with tin lead frame plating.

  • Integrated capacitor for EMC suppression in a single over molded, miniature package
  • Wide leads facilitate ease of assembly
  • True zero-speed operation
  • Pulse-width output protocol
  • Automatic Gain Control (AGC) for air gap independent switch points
  • Automatic Offset Adjustment (AOA) for signal processing optimization, providing large operating air gap range
  • Single chip sensing IC for high reliability
  • Fully synchronous digital logic with Scan and IDDQ testing

Typical Applications

Allegro 2-Pin SIP UB Package

The A1698  is available in a lead (Pb) free 2-pin SIP (Suffix UB) package with a 100% matte tin plated leadframe.

UB Package Documentation

Part Number Specifications and Availability