HAL320 datasheet(2/13 Pages) ETC

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HAL320

Micronas

Differential Hall Effect Sensor IC

in CMOS technology

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).

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 requires positive and negative values of

∆B = BS1 – BS2 for correct operation.

Basically, there are two ways to generate the differential

signal

∆B:

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

of the package (see Fig. 4, Fig. 5, and Fig. 6).

– Back-bias applications:

A magnet on the back side of the package generates

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

signal

∆B results from the magnetic modulation of the

back-bias field by a rotating ferromagnetic target.

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 two SMD-packages

(SOT-89A and SOT-89B) and in a leaded version

(TO-92UA).

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 of 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

– EMC corresponding to DIN 40839

Marking Code

Type

Temperature Range

HAL 320SF,

HAL 320SO,

HAL 320UA

320A

320E

320C

Operating Junction Temperature Range (TJ)

A: TJ = –40 °C to +170 °C

E: TJ = –40 °C to +100 °C

C: TJ = 0 °C to +100 °C

The relationship between ambient temperature (TA) and

junction temperature (TJ) is explained on page 11.

Hall Sensor Package Codes

Type: 320

HAL XXXPA-T

Temperature Range: A, E, or C

Package: SF for SOT-89B

SO for SOT-89A

UA for TO-92UA

→ Type: 320

→ Package: TO-92UA

→ Temperature Range: TJ = –40 °C to +100 °C

Example: HAL 320UA-E

Hall sensors are available in a wide variety of packaging

versions and quantities. For more detailed information,

please refer to the brochure: “Ordering Codes for Hall

Sensors”.

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