DRV5056 Ratiometric Unipolar Hall Effect Sensors

By Texas Instruments 43

DRV5056 Ratiometric Unipolar Hall Effect Sensors

Texas Instruments' DRV5056 is a linear Hall effect sensor that responds proportionally to flux density of a magnetic south pole. The device can be used for accurate position sensing in a wide range of applications.

The DRV5056 features a unipolar magnetic response; the analog output drives 0.6 V when no magnetic field is present and increases when a south magnetic pole is applied. This response maximizes the output dynamic range in applications that sense one magnetic pole. Four sensitivity options further maximize the output swing based on the required sensing range.

The device operates from 3.3 V or 5 V power supplies. Magnetic flux perpendicular to the top of the package is sensed, and the two package options provide different sensing directions.

The device uses a ratiometric architecture that can minimize error from VCC tolerance when the external analog-to-digital converter (ADC) uses the same VCC for its reference. Additionally, the device features magnet temperature compensation to counteract how magnets drift for linear performance across a wide -40°C to +125°C temperature range.

Features
  • Analog output with 0.6 V quiescent offset
    • Maximizes voltage swing for high accuracy
  • Magnetic sensitivity options (at VCC = 5 V)
    • A1: 200 mV/mT, 20 mT range
    • A2: 100 mV/mT, 39 mT range
    • A3: 50 mV/mT, 79 mT range
    • A4: 25 mV/mT, 158 mT range
  • Unipolar linear Hall effect magnetic sensor
  • Standard industry packages
    • CCM/DCM for high efficiency at light load
    • CCM for constant frequency at light load
  • Compensation for magnet temperature drift
  • Low-noise output with ±1 mA drive
  • Fast 20 kHz sensing bandwidth
  • Current sensing
Applications
  • Precise position sensing
  • Industrial automation and robotics
  • Home appliances
  • Gamepads, pedals, keyboards, and triggers
  • Height leveling; tilt and weight measurement
  • Fluid flow rate measurement
  • Medical devices
  • Industrial and military applications

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