DRV5032_17 Datasheet, PDF (15/33 Pages) Texas Instruments – Ultra-Low-Power Digital-Switch Hall Effect Sensor

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DRV5032
SLVSDC7A – APRIL 2017 – REVISED MAY 2017
9.2.2.2 Detailed Design Procedure
A standard 2-pole magnet produces strong perpendicular flux components near the outer edges of the poles, and
no perpendicular flux near the center at the north-south pole boundary. When the DRV5032FD is below the
center of the magnet, it receives close to 0 mT, and both outputs drive high. If the switch with the embedded
magnet moves left or right, the sensor receives a north or south field, and OUT1 or OUT2 drive low. This
provides 3 digital states of detection.
The length of the magnet should ideally be two times the distance of travel toward each side. Then, when the
switch is pushed to either side, the outer edge of the magnet is positioned directly above the sensor where it
applies the strongest perpendicular flux component.
To determine the magnitude of perpendicular magnetic flux for a given magnet and distance, TI recommends
using simulation software or testing with a linear Hall effect sensor.
9.2.2.3 Application Curve
Figure 18 shows the typical magnetic flux lines around a 2-pole magnet.
Figure 18. Typical Magnetic Flux Lines
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