ADVANCE INFORMATION

HAL700

Micronas

3

Dual Hall-Effect Sensor with Independent Outputs

1. Introduction

The HAL 700 is a monolithic CMOS Hall-effect sensor

consisting of two independent latched switches (see

Fig. 3–3) with closely matched magnetic characteris-

tics controlling two independent open-drain outputs.

The Hall plates of the two switches are spaced

2.35 mm apart.

In combination with an active target providing a

sequence of alternating magnetic north and south

poles, the sensor forms a system generating the sig-

nals required to control position, speed, and direction

of the target movement.

The device includes temperature compensation and

active offset compensation to provide excellent stability

and matching of the switching points in the presence of

mechanical stress over the whole temperature- and

supply voltage range. This is required by systems

which determine the direction by comparing two trans-

ducer signals.

The sensor is designed for industrial and automotive

applications and operates with supply voltages from

3.8 V to 24 V in the ambient temperature range from

−40 °C up to 125 °C.

The HAL 700 is available in the SMD package

SOT-89B.

1.1. Features

– two independent Hall-switches

– distance of Hall plates: 2.35 mm

– low sensitivity

– temperature coefficient of

−2000 ppm/K in all mag-

netic characteristics

– 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

– robustness of magnetic characteristics against

mechanical stress

– short-circuit protected open-drain outputs by ther-

mal shutdown

– constant switching points over a wide supply voltage

range

– EMC corresponding to DIN 40839

1.2. Applications

The HAL 700 is the ideal sensor for position-control

applications with direction detection and alternating

magnetic signals such as:

– multipole magnet applications,

– rotating speed and direction measurement,

position tracking (active targets), and

– window lifters.