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Rotational sensors

Compact and easy to design in, NXP®.s magnetoresistive rotational speed sensors provide a simple and cost-effective rotational sensing solution. They are ready to use and include the sensor, a back-biasing magnet and an advanced signal conditioning IC, all housed in a special multi-chip package.

The well-tried and trusted KMI1xx technology provides high robustness against large magnetic fields and high temperatures, and is very stable over temperature and life time. A choice of 3 different back-biasing magnets covers sensing of active or passive targets. Devices in the KMI15 and KMI20 families have a current output using two-wire technology, while those in the KMI16 and KMI18 families feature an open collector output, with three-wire technology.

Features

  • Zero speed capability
  • Wide air gap between sensor and target
  • Large measuring distance / air gap up to 2.9mm
  • Speed detection capability down to 0 Hz
  • High-frequency: 25 kHz
  • Wide frequency range
  • Output characteristics: two-wire current and open collector interface
  • Prepared for injection moulding (stable leadframe, positioning aids)
  • Lower total cost of electro-mechanical system due to MR benefits and integrated components

Target Applications

  • Anti-blocking systems (ABS)
  • Engine management (crankshaft, camshaft)
  • Transmission systems
  • Vehicle speed