B

PCB

GND

OUT

SEL

REF

Output

Control

Voltage

Regulator

Ultra-low-power

Oscillator

Element Bias

Offset

Cancellation

Temperature

Compensation

Amp

0.1 F

(min)

Copyright © 201 7, Texas Instrumen ts Incorpor ate d

7

DRV5012

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SLVSDD5 – AUGUST 2017

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Copyright © 2017, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The DRV5012 device is a magnetic sensor with a digital output that latches the most recent pole measured.

Applying a south magnetic pole near the top of the package causes the output to drive low, a north pole causes

the output to drive high, and the absence of a magnetic field causes the output to continue to drive the previous

state, whether low or high.

The device integrates a Hall effect element, analog signal conditioning, and a low-frequency oscillator that

enables ultra-low average power consumption. By operating from a 1.65-V to 5.5-V supply, the device

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

input pin, SEL, sets the sampling frequency to 20 Hz or 2.5 kHz with a tradeoff in power consumption.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Magnetic Flux Direction

The DRV5012 device is sensitive to the magnetic field component that is perpendicular to the top of the package

(as shown in Figure 7).

Figure 7. Direction of Sensitivity