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HAL320

Differential Hall-Effect Sensor IC

Micronas 

HAL320

DATA SHEET

Differential Hall Effect Sensor IC

in CMOS technology

Release Notes: Revision bars indicate significant

changes to the previous edition.

1. Introduction

The HAL 320 is a differential Hall switch produced in

CMOS technology. The sensor includes 2 temperature-

compensated Hall plates (2.25 mm apart) with active off-

set compensation, a differential amplifier with a Schmitt

trigger, and an open-drain output transistor (see Fig.

2–1).

The HAL 320 is a differential sensor which responds to

spatial differences of the magnetic field. The Hall volt-

ages at the two Hall plates, S1 and S2, are amplified with

a differential amplifier. The differential signal is

compared with the actual switching level of the internal

Schmitt trigger. Accordingly, the output transistor is

switched on or off.

The sensor has a bipolar switching behavior and re-

quires positive and negative values of ΔB = BS1 – BS2 for

correct operation.

Basically, there are two ways to generate the differential

signal ΔB:

– Rotating a multi-pole-ring in front of the branded side

of the package (see Fig. 3–1, Fig. 3–2, and Fig. 3–3;

Please use HAL 300 only).

– Back-bias applications:

A magnet on the back side of the package generates

a back-bias field at both Hall plates. The differential

signal ΔB results from the magnetic modulation of the

back-bias field by a rotating ferromagnetic target

(Please use HAL 320 only).

The active offset compensation leads to constant mag-

netic characteristics over supply voltage and tempera-

ture.

The sensor is designed for industrial and automotive ap-

plications and operates with supply voltages from 4.5 V

to 24 V in the ambient temperature range from –40 °C

up to 150 °C.

The HAL 320 is an ideal sensor for target wheel applica-

tions, ignition timing, anti-lock brake systems, and revo-

lution counting in extreme automotive and industrial en-

vironments

The HAL 320 is available in the SMD-package

SOT89B-2 and in the leaded versions TO92UA-3 and

TO92UA-4.

1.1. Features:

– distance between Hall plates: 2.25 mm

– operates from 4.5 V to 24 V supply voltage

– switching offset compensation at 62 kHz

– overvoltage protection

– reverse-voltage protection at VDD-pin

– short-circuit protected open-drain output by thermal

shutdown

– operates with magnetic fields from DC to 10 kHz

– output turns low with magnetic south pole on branded

side of package and with a higher magnetic flux densi-

ty in sensitive area S1 as in S2

– on-chip temperature compensation circuitry mini-

mizes shifts of the magnetic parameters over temper-

ature and 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 hystere-

sis

– EMC corresponding to ISO 7637

1.2. Marking Code

All Hall sensors have a marking on the package surface

(branded side). This marking includes the name of the

sensor and the temperature range.

1.3. Operating Junction Temperature Range (TJ)

The Hall sensors from Micronas are specified to the chip

temperature (junction temperature TJ).

The HAL 320 is available in the temperature range “A”

only.

A: TJ = –40 °C to +170 °C

The relationship between ambient temperature (TA) and

junction temperature (TJ) is explained in section 4.1. on

page 20.

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