HAL740 datasheet(4/22 Pages) MICRONAS

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HAL700, HAL740

DATA SHEET

Nov. 30, 2009; DSH000029_002EN

Micronas

Dual Hall-Effect Sensors with Independent Outputs

Release Note: Revision bars indicate significant

changes to the previous edition.

1. Introduction

The HAL700 and the HAL740 are monolithic CMOS

Hall-effect sensors consisting of two independent

switches controlling two independent open-drain out-

puts. The Hall plates of the two switches are spaced

2.35 mm apart.

The devices include temperature compensation and

active offset compensation. These features provide

excellent stability and matching of the switching points

in the presence of mechanical stress over the whole

temperature and supply voltage range.

The sensors are designed for industrial and automo-

tive applications and operate with supply voltages

from 3.8 V to 24 V in the ambient temperature range

from

−40 °C up to 125 °C.

The HAL700 and the HAL740 are available in the

SMD-package SOT89B-2.

1.1. Features

– two independent Hall-switches

– distance of Hall plates: 2.35 mm

– switching offset compensation at typically 150 kHz

– operation from 3.8 V to 24 V supply voltage

– operation with static and dynamic magnetic fields up

to 10 kHz

– overvoltage protection at all pins

– reverse-voltage protection at VDD-pin

– robustness of magnetic characteristics against

mechanical stress

– short-circuit protected open-drain outputs

by thermal shut down

– constant switching points over a wide

supply voltage range

– EMC corresponding to ISO 7637

1.2. Family Overview

The types differ according to the switching behavior of

the magnetic switching points at the both Hall plates

S1 and S2.

Latching Sensors:

The output turns low with the magnetic south pole on

the branded side of the package. The output maintains

its previous state if the magnetic field is removed. For

changing the output state, the opposite magnetic field

polarity must be applied.

Unipolar Sensors:

In case of a south-sensitive switch, the output turns

low with the magnetic south pole on the branded side

of the package and turns high if the magnetic field is

removed. The switch does not respond to the

magnetic north pole on the branded side.

In case of a north-sensitive switch, the output turns low

with the magnetic north pole on the branded side of

the package and turns high if the magnetic field is

removed. The switch does not respond to the mag-

netic south pole on the branded side.

Type

Switching Behavior

See

Page

HAL700

S1: latching

S2: latching

HAL740

S1: unipolar north sensitive

S2: unipolar south sensitive

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