8 Detailed Description

8.1 Overview

The TMAG5131-Q1 device is a magnetic sensor with a digital output that indicates when the magnetic flux

density threshold has been crossed. The output consists of a push-pull turning low when a field is present or

turning high when no field is present. As an omnipolar switch the output is sensitive to both the South and

the North Pole. The device integrates a Hall Effect element, analog signal conditioning, and a low-frequency

oscillator that enables ultra-low average power consumption. To achieve low-power consumption the device

periodically measures magnetic flux density, updates the output, and enters into a low-power sleep state. With a

supply range of 1.65 V to 5.5 V, this device is designed for battery-operated low power automotive applications.

Finally, its wide temperature range of -40°C to 125°C makes this device suited for wide range of applications.

8.2 Functional Block Diagram

Output

control

LDO

Chopper

stabiliza on

VCC

GND

X

Amp

Low-Power

Oscillator

OUT

Output

control

LDO

Chopper

stabiliza on

VCC

GND

X

Amp

Low-Power

Oscillator

OUT

VCC

R1

VCC

Block Diagram (Push-pull)

Block Diagram (Open-drain)

8.3 Feature Description

8.3.1 Magnetic Flux Direction

Figure 8-1 shows that the TMAG5131-Q1 device is sensitive to the magnetic field component that is

perpendicular to the top of the package.

PCB

SOT-23

B

Figure 8-1. Direction of Sensitivity

Magnetic flux that travels from the bottom to the top of the package is considered positive in this data sheet. This

condition exists when a south magnetic pole is near the top of the package. Magnetic flux that travels from the

top to the bottom of the package results in negative millitesla values.

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TMAG5131-Q1

SLYS050 – APRIL 2023

Copyright © 2023 Texas Instruments Incorporated

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