A3422(2009) Datasheet PDF - Allegro MicroSystems

Hall Effect Direction Detection Sensor IC
   
The A3422xKA Hall-effect, direction-detection sensor IC is a new generation of special-function integrated devices that is applicable to sensing the direction of rotation of a ring magnet. This transducer provides separate digital outputs that provide information on magnet rotation speed, direction, and magnet pole count. This device eliminates the major manufacturing hurdles encountered in fine-pitch direction-detection applications, namely maintaining accurate mechanical location between the two active Hall elements. Here, the two Hall elements are photo-lithographically aligned to better than 1 μm, as contrasted with 100 μm or worse mechanical location tolerance when manufactured discretely. This highly sensitive, temperature-stable, magnetic transducer is ideal for use in digital-encoder systems in the harsh environments of automotive or industrial applications. The A3422xKA is a high-sensitivity device optimized for use with high-density magnets.
   
FEATURES
• Internal Direction-Decoding Circuitry
• Two Matched Hall Bipolar Switches on a Single Substrate
• Superior Temperature Stability
• 4.5 V to 18 V Operation
    Electrically Defined Power-On State
    Undervoltage Lockout