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The above sensors include a voltage regulator, two Hall-effect sensitive components, a temperature compensation circuit, a low-level amplifier, a bandpass filter, a Schmitt trigger, and an output driver that requires a pull-up resistor. The on-board regulator operates from 4V to 26.5V. The output stage converts 20mA over the entire frequency response range of the sensor and is compatible with bipolar and MOS logic.
These sensors offer different switching points to meet a variety of application needs. The A1421LK provides a zero crossing; the A1422LK includes precision settings and equalization switching points; the A1423LK has strong shock resistance and a wide set of switching points.
These three gear sensors with a single IC switch and two integrated Hall inverters sense changes in the magnetic field and differentially amplify through on-chip electronics. The monolithic IC switches included in the three devices are used to respond to changes in the differential magnetic field produced by moving ring magnets or irons with magnets behind. Differential sensing provides resistance to radial vibrations that occur in the working air gap of the device due to changes in common-mode signals.
Steady-state system compensation is eliminated with an on-chip differential bandpass filter that is immune to electromagnetic interference. These sensors utilize the advanced temperature compensation, sensitivity, and Schmitt trigger switching points of the high-pass filter to ensure optimal operation up to low frequencies over a wide range of air gaps and temperature ranges.
Allegro MicroSystems launches 3 new gear sensors
Allegro MicroSystems' AC-coupled Hall-effect devices add three new gear sensors - the A1421LK, the A1422LK and the A1423LK. These new devices feature small package size, integrated filter capacitors, and high reliability for speed, position, and timing applications such as transmission and engine management, as well as industrial applications.