HAL571 datasheet(3/20 Pages) ETC

3 / 20 page

HAL57x, HAL58x

ADVANCE INFORMATION

Micronas

Two-Wire Hall Effect Sensor Family

in CMOS technology

1. Introduction

This sensor family consists of different two-wire Hall

switches produced in CMOS technology. All sensors

change the current consumption depending on the ex-

ternal magnetic field and require only two wires between

sensor and evaluation circuit. The sensors of this family

differ in the magnetic switching behavior and switching

points.

The sensors include a temperature-compensated Hall

plate with active offset compensation, a comparator, and

a current source. The comparator compares the actual

magnetic flux through the Hall plate (Hall voltage) with

the fixed reference values (switching points). According-

ly, the current source is switched on (high current

consumption) or off (low current consumption).

The active offset compensation leads to constant mag-

netic characteristics in the full supply voltage and tem-

perature range. In addition, the magnetic parameters

are robust against mechanical stress effects.

The sensors are designed for industrial and automotive

applications and operate with supply voltages from 3.75

V to 24 V in the junction temperature range from –40

°C

up to 140

°C. All sensors are available in the SMD-pack-

age SOT-89B and in the leaded version TO-92UA.

1.1. Features:

– current output for two-wire applications

– low current consumption: 5 mA ... 6.9 mA

– high current consumption: 12 mA ... 17 mA

– junction temperature range from –40

°C up to 140 °C.

– operates from 3.75 V to 24 V supply voltage

– operates with static magnetic fields and dynamic mag-

netic fields up to 10 kHz

– switching offset compensation at typically 145 kHz

– overvoltage and reverse-voltage protection

– magnetic characteristics are robust against mechani-

cal stress effects

– constant magnetic switching points over a wide supply

voltage range

– the decrease of magnetic flux density caused by rising

temperature in the sensor system is compensated by

a built-in negative temperature coefficient of the mag-

netic characteristics

– ideal sensor for applications in extreme automotive

and industrial environments

– EMC corresponding to DIN 40839

1.2. Family Overview

Type

Switching

Behavior

Sensitivity

see

Page

571

unipolar

medium

573

unipolar

low

574

unipolar

medium

575

latching

medium

581

unipolar

inverted

medium

584

unipolar

inverted

medium

Unipolar Switching Sensors:

The sensor turns to high current consumption with the

magnetic south pole on the branded side of the package

and turns to low consumption if the magnetic field is

removed. The sensor does not respond to the magnetic

north pole on the branded side.

BHYS

Current consumption

0BON

BOFF

IDDlow

Fig. 1–1: Unipolar Switching Sensor

IDDhigh

Unipolar Inverted Switching Sensors:

The sensor turns to low current consumption with the

magnetic south pole on the branded side of the package

and turns to high consumption if the magnetic field is

removed. The sensor does not respond to the magnetic

north pole on the branded side.

BHYS

0BOFF

BON

Fig. 1–2: Unipolar Inverted Switching Sensor

IDDhigh

IDDlow

Current consumption

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