The MLX90254 is an AC-coupled differential gear-tooth sensor which targets automotive crankshaft applications. It is designed to be used with a back bias magnet to sense the rotating speed (incremental position) of a ferrous toothwheel. Alternatively, the MLX90254 can also be used to sense the rotating speed of a magnetic encoder.

The AC-coupling is realized through an on-chip capacitor implementing a high-pass filter. This filter prevents a zero-speed operation but it enables a continuous-time operation (no sampling) and consequently a high sensitivity (low hysteresis) and repeatability (jitter).

Its low hysteresis enables it to operate over a wide range of airgap and a broad temperature range (from -40°C to 150°C).

The device has an open-drain output (low-side) which is short-circuit protected.

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Top features

  • Differential gear-tooth sensor

  • AC-coupled

  • Operation from 15-20 Hz

  • Distance between Hall plates: 2.25 mm

  • Excellent repeatability (jitter) performance

  • Large airgap range

  • 4-SIP-VA package (Through Hole)
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AC-coupled differential gear-tooth sensor - MLX90254

Features and benefits

  • Differential gear-tooth sensor

  • AC-coupled

  • Operation from 15-20 Hz

  • Distance between Hall plates: 2.25 mm

  • Excellent repeatability (jitter) performance

  • Large airgap range

  • 4-SIP-VA package (Through Hole)

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