DRV5032_17 Datasheet, PDF (13/33 Pages) Texas Instruments – Ultra-Low-Power Digital-Switch Hall Effect Sensor

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9 Application and Implementation
DRV5032
SLVSDC7A – APRIL 2017 – REVISED MAY 2017
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The DRV5032 device is typically used to detect the proximity of a magnet. The magnet is often attached to a
movable component in the system.
9.1.1 Output Type Tradeoffs
The push-pull output allows for the lowest system power consumption, since there is no current leakage path
when the output drives high or low. The open-drain output involves a leakage path when the output drives low,
through the external pullup resistor.
The open-drain outputs of multiple devices can be tied together to form a logical AND. In this setup, if any sensor
drives low, the voltage on the shared node becomes low. This can allow a single GPIO to measure an array of
sensors.
9.2 Typical Applications
9.2.1 General-Purpose Magnet Sensing
distance
V_CC
NS
DRV5032
V_CC
OUT
GND
Controller
GPIO
Copyright © 201 7, Texas Instrumen ts Incorpor ate d
Figure 15. Typical Application Diagram
9.2.1.1 Design Requirements
For this design example, use the parameters listed in Table 1.
Table 1. Design Parameters
DESIGN PARAMETER
V_CC
Magnet
Closest magnet distance
Magnetic flux density at closest distance
Magnetic flux density when magnet moves away
EXAMPLE VALUE
3.3 V
1-cm Cube NdFeB
2.5 cm
7.8 mT
Close to 0 mT
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