DRV5057 Digital PWM-Output Hall Effect Sensor

By Texas Instruments 97

DRV5057 Digital PWM-Output Hall Effect Sensor

Texas Instruments' DRV5057 is a linear Hall effect sensor that responds proportionally to magnetic flux density. The device can be used for accurate position sensing in a wide range of applications.

The device operates from 3.3 V or 5 V power supplies. When no magnetic field is present, the output produces a clock with a 50% duty cycle. The output duty cycle changes linearly with the applied magnetic flux density, and four sensitivity options maximize the output dynamic range based on the required sensing range. North and south magnetic poles produce unique outputs. The typical pulse-width modulation (PWM) carrier frequency is 2 kHz.

Magnetic flux perpendicular to the top of the package is sensed, and the two package options provide different sensing directions.

Since the PWM signal is based on edge-to-edge timing, signal integrity is maintained in the presence of voltage noise or ground potential mismatch. This signal is suitable for distance transmission in noisy environments, and the always-present clock allows the system controller to confirm there are good interconnects. 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
  • PWM-output
  • Operates from 3.3 V and 5 V power supplies
  • Magnetic sensitivity options (at VCC = 5 V):
    • A1: 2%D/mT, ±21 mT range
    • A2: 1%D/mT, ±42 mT range
    • A3: 0.5%D/mT, ±84 mT range
    • A4: 0.25%D/mT, ±168 mT range
  • Clock output: 2 kHz with 50% quiescent duty cycle
  • Open-drain output with 20 mA sink capability
  • Standard industry package:
    • Surface-mount SOT-23
    • Through-hole TO-92
  • Compensation for magnet temperature drift
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
  • Absolute angle encoding
  • Current-sensing

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