Allegro introduces a new speed sensor IC especially suitable for two-wheeled vehicle applications

     Allegro MicroSystems has announced the introduction of a new Hall effect sensor, the A17301, ideal for two-wheeled vehicles, particularly for position and timing applications such as speedometers and engine control tachometers. The 3-pin SIP package (suffix UC) is lead-free, and the pin frame is 100% mist tin electroplating. The operating temperature range is -40℃ ~ 160℃.

     The A17301 integrates several EMC components in a small SIP package and is a highly robust choice for magnetic or iron wheels (with integrated back magnetic). The new device eliminates the need for external filtering capacitors, while providing greater reliability and reducing the cost of the final overall sensor solution. The A17301 incorporates dual Hall-effect elements with a pitch of 2.2 mm and signal processing technology that can be switched based on differential magnetic signals.

     Bob Fortin, vice president of Allegro's Sensor Business unit, said: "The 17301 uses Allegro's proprietary differential architecture to avoid the flatline and chatter problems that are often encountered with individual Hall component solutions. The device is ideal for obtaining information such as speed and duty cycle in applications such as position and timing.

     The A17301 includes sophisticated digital circuitry to reduce system offset, calibrate switching point gain that is not affected by the air gap, and achieve true zero-speed operation. The operational mode recalibration function is protected from environmental effects such as micro-oscillations of the target or sudden changes in the air gap. Regardless of the signal offset between the output edges, the use of digital peak detectors for output switching control ensures that the input signals are continuously and accurately tracked.