A19350: High Accuracy GMR Wheel Speed and Direction Sensor IC

Description

The A19350 is a giant magnetoresistance (GMR) integrated circuit (IC) that provides a user-friendly two-wire solution for applications where speed and direction information is required. The small integrated package includes an integrated capacitor and GMR IC in a single overmold design with an additional molded lead-stabilizing bar for robust shipping and ease of assembly.

The GMR-based IC is designed for use in conjunction with front-biased ring magnet encoders. State-of-the-art GMR technology with industry-leading signal processing algorithms accurately switch in response to low-level differential magnetic signals. The high sensitivity of GMR combined with differential sensing offers inherent rejection of interfering common-mode magnetic fields and valid speed and direction over larger air gaps, commonly required in wheel speed sensing applications.

Patented GMR technology allows the same orientation as Hall-effect for a drop-in solution in the application.

Integrated diagnostics are used to detect an IC failure which impacts the output protocol’s accuracy, providing coverage compatible with ASIL B compliance. Built-in EEPROM scratch memory offers traceability of the device throughout the IC’s production process.

The IC is offered in the UB package, which integrates the IC and a high-temperature ceramic capacitor in a single overmold SIP package for enhanced EMC performance. The 2-pin SIP package is lead (Pb) free, with tin leadframe plating.

 For application needing just speed sensing, please see the A19250 High Accuracy GMR Wheel Speed Sensor IC.

Top Features

  • GMR technology integrates high sensitivity MR (magnetoresistive) sensor elements and high precision BiCMOS circuits on a single silicon integrated circuit, offering high accuracy, low magnetic field operation
  • Integrated capacitor in a single overmolded miniature package provides greater EMC robustness
  • SolidSpeed Digital Architecture™ supports advanced algorithms, maintaining performance in the presence of extreme system-level disturbances, including vibration immunity capability over the full target pitch
  • Flexible orientation for xMR or Hall replacement
  • ASIL B rating based on integrated diagnostics and certified safety design process
  • Two-wire current source output pulse-width protocol supporting speed, direction, and ASIL
  • EEPROM offers device traceability throughout the production process

Packaging