Linear hall effect sensor with digital PWM output

The 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.

Because 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. 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. Device options for no temperature compensation of

magnet drift are also available.