Hall Catalog 200305

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Allegro Hall-EffectSensors

Allegro Hall-EffectSensors

InnovativeSensing SolutionsInnovativeSensing Solutions

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Technology Overview

Wafer Fabrication & IC Packaging 2

Speed Sensors

ATS625LSGHigh-Repeatability, Adaptive Gear Speed Sensor 3

A3065LKDual Zero-Crossing Ring Magnet Speed Sensor 4

ATS671/ATS672LSETrue Power-On State High-Accuracy Single-Element Position Sensors 5

ATS643LSHTwo-Wire, Adaptive Speed Sensor with High Wobble Immunity 6

ATS650LSHTwo-Wire Speed and Direction Sensor with Diagnostics 7

Position Sensors

A1140/A1141/A1142/A1143/A1144Programmable Two-Wire Unipolar Proximity Sensors 8

A1321/A1322/A1323Miniature Linear Hall-Effect Sensors 9

A3245/A3246Omnipolar Digital Switches with On-Chip Regulator 10

A3425Dual Output Ring Magnet Position and Speed Sensor 11

A3212/A3213/A3214

Micropower Omnipolar Digital Switches 12

Current Sensors

ACS750Linear Output Hall-Effect Current Sensors 13

Contents

The products featured here represent only a small portion of Allegro MicroSystems, Inc.extensive Hall-effect sensor product portfolio. To obtain additional information on thecomplete Allegro portfolio please visit our website at www.allegromicro.com.

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SE SH SG C

MLP SOT23W SOIC-8

UA K

Wafer FabricationAllegro BiCMOS wafer fabrication technology

is a merging of analog and digital signal

conditioning that is unique in the industry.

This merging of complimentary technologies

allows the design of semiconductor integrated

circuits that have self-calibration, high EMC

performance and low jitter features. The

resulting integrated circuits can be

customized to address specific

applications related problems.

IC PackagingThe integration of custom Hall-effectsensor integrated circuits and the latest

innovations in IC package technology bring

custom sensor solutions to solve applications

challenges. Allegro leads the industry in

integrated magnetic sensor package

technology, surface mount sensor

packages, ultra-low profile MLP packages

as well as traditional SIP configurations.

Key Features and Benefits:

High sustained voltages of 30 V

Fast logic speed Low drop regulator blocks

Programming structures

Robust EMC & ESD structures

Low Hall plate offset

Chopper stabilized andcontinuous time sensing circuits

Allegro Microsystems

Technology Driven

Integrated Packages

Surface Mount Packages

Through-Hole Packages

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Speed Sensor

For more information visit www.allegromicro.com/hall/ca

Functional Block Diagram

ReferenceGenerator

AutomaticGain

Control

PDAC

NDAC

THRESHN

THRESHP

PPEAK

PPEAK

InternalRegulator

ThresholdComparator

ThresholdLogic

OutputTransistor

CurrentLimit

Ground

Output

Vcc

HallAMP

Allegros improved ATS625LSGzero-speed

gear tooth sensor, for use in crankshaft

applications, incorporates improved EMC

and tighter repeatabilityacross the entire

automotive temperature range. The dual-

element Hall IC with integrated magnet,

switches in response to differential magnetic

signals created by a ferrous target. Adaptive

thresholds, automatic gain control (AGC)

and high-resolution DACs are used to achieve

accurate and repeatable switch points,

independent of airgap.

Also available:

A3065LK, Ring Magnet Sensing

ATS625LSGHigh-Repeatability,

Adaptive Gear Speed Sensor

Key Features and Benefits: Highly repeatable over temperature

Tight timing accuracy

True zero speed operation

Air gap independent switch points

Large operating air gaps

(>2.5 mm on typical crankshaft targets)

Innovative package for easy integration (SG)

Wide operating temperature

range (>150oC max)

High reliability

Crankshaft Applicatio

SG Package

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HallAMP

GainStage

Band-PassFilter

ComparatorBlock

OutputOutput

Ground

InternalRegulator

Vcc

Brp BrpBop

OutputSignal

Differential Magnetic Signal

Speed Sensors

For more information visit www.allegromicro.com/hall/catalog

The A3065LKis ideal for crankshaft speed

sensing applications using ring magnets.

This AC-coupled differential sensor with

on-chip capacitor, is a true zero crossing

detector and accurately detects both the

rising and falling mechanical edges.

Excellent repeatability is achieved over

the entire automotive temperature range

by these accurate switch points and an

on-chip temperature compensation circuit.

Also available:

ATS625LSG, Zero-Speed Applications

A3065LKDual Zero-Crossing

Ring Magnet Speed Sensor


Excellent repeatability up to 150C

Resistant to EMI

On-chip capacitor

Dual zero-crossing detector

Reverse battery protection

Large operating air gaps (20 G p-p)

High reliability


Crankshaft Applications

K Package

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Speed Sensor


LPF

LPF

DIFF

6-BitOffsetAdjust

3-Bit TCAdjust

6B Offset3B TC

HallAMP

VREF

Automatic Gain Control

TPOS

TPOSOutput

4-BitTPOSTrim

Power OnInitialize

AggresiveUpdateLogic

InternalRegulator(Analog)

InternalRegulator(Digital)

OutputState

8-bitCounter

CLK

COMP_P9-Bit PDAC PDAC

NDAC

LPF

AggresiveUpdateLogic

OutputState

8-bitCounter

CLK

COMP_P9-Bit NDAC

ThresholdOutput

ThresholdOutput

ThresholdComparator

VTHRESH

DIFF

OutputDriver

OutputStatePin 2

VccPin 1

POR

DIFF

The ATS671/2LSEzero-speed gear

tooth sensors are ideal solutions for use

in camshaft speed sensing applications and

are especially tolerant of gear eccentricity

(wobble). The true power-on state feature,

achieved through the use of a single-element

Hall IC and a patented magnet, gives an

accurate position indication of the gear at

the moment the sensor is enabled. Adaptive

thresholds, automatic gain control (AGC) andhigh-resolution DACs are used to achieve

accurate and repeatable switch points,

independent of airgap. The ATS671 and

ATS672 versions provide optional threshold

choices to meet a wide range of application

requirements.

Also available:

ATS612LSG, Analog Peak Detector

ATS671/2LSETrue Power-On State High-Accuracy

Cam Position Sensor

Key Features and Benefits: Tight timing accuracy (better than 1oC)

Quick start-up

(calibration completed within three edges)

Innovative package design

High immunity to gear eccentricity

Operating air gaps >2.5 mm

(on typical cam targets)

True power-on state

High reliability


SE Package

Camshaft Applicatio

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Speed Sensors

SH Package

HallAMP

VNeg

InternalRegulator

Vcc

PDAC

THRESHN

THRESHP

ReferenceGenerator

&Updates

OffsetAdjust

AGC

ThreshLogic

NDAC


The ATS643LSHis an innovative member

of Allegros cutting edge speed sensing

solutions. This two-wire sensor is optimized

to tolerate the difficulties of transmission

speed sensing, including withstanding

dynamic changes in airgap while maintaining

good duty cycle. The unique packaging

concept integrates the magnet and a

monolithic, silicon IC, which are carefully

designed to provide optimal performance.

Allegros advanced quick calibration routine

and signal processing make speed sensing

easier and more reliable then ever before.

Also available:

ATS665LSG, Three-Wire Solution

ATS643LSHTwo-Wire, Adaptive Speed Sensor

with High-Wobble Immunity

Key Features and Benefits: >2.75 mm airgap

Two-wire operation

High immunity to running mode vibration

Immune to airgap variation greater

than 0.75 mm (wobble, bounce)

Tight accuracy over airgap range

Innovative package for easy integration (SH)

High reliability


Transmission Applications

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Speed Sensor



DIFFLeftChannelAGC

Right ChannelOutput

Right ChannelDIFF

Right ChannelTrack and Hold

Right ChannelOffset Adjust

AMPHallChannelRight

AGC DACCommon

Left ChannelTrack and Hold

AGC DACCommon

OutputProtocolCircuitry

Airgap andTemperatureDiagnosticCircuitry

DirectionDetection

Logic

GND/Output

Vcc/Output

Left ChannelOutput

Left Channel

Left ChannelOffset Adjust

LeftChannelAMP

Hall

AGCChannelRight

InternalRegulator

The ATS650LSHis designed with an

integrated magnet and IC for use in ABS

wheel speed applications. The single-chip IC

contains three highly sensitive Hall elements

and a sophisticated digital circuit to provide

both accurate speed and direction

information. The regulated current output

is configured for two-wire operation

integrating the direction and diagnostic

information into the speed signal using

a PWM protocol.

Also available:

ATS645LSH, Simplified Speed Sensor

ATS650LSHTwo-Wire Speed and

Direction Sensor with Diagnostics


2.5 mm airgap (on typical ABS targets)

Quick calibration within three target edges

Direction change detection on first edge

Diagnostics include airgap and temperatur

True zero-speed operation

Greater than 8 kHz operation

High reliability

SH Package

ABS Applicatio

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Position Sensors

ABS Applications

Clock/Logic

AMP

Program/Lock

S/H LPF

OffsetAdjust

Reg

To AllSubcircuits

ProgrammingLogic

OptionalGND

("UA" Only)

Gnd

SupplyPin 1


SOT23WPackage

UA Package

The A114xrepresent Allegros new family

of field programmable, two-wire, uni-polar

switches. These two-wire devices allow

customers to externally trim the operate

point, after final assembly, to dial out

mechanical stack-ups resulting from man-

ufacturing process tolerances. In addition to

reducing manufacturing costs and liability

by eliminating one wire in the application,

there is also the benefit of inherent diagnostic

capabilities. As there are two distinct current

levels, a control unit can interpret open/short

and indeterminate states based on the output

of the device.

The A114x devices are available in both SOT23W

(LH) and TO-92 SIP (UA) packages.

Also available:

A118xFactory Programmed Two-Wire

Unipolar Switches, A324xSwitch Family,

A3212Micropower, Omnipolar Switches, A328xLatch Family

A1140/1/2/3/4Programmable Two-Wire

Unipolar Proximity Sensors

Key Features and Benefits: Chopper stabilization for

Extremely low switch point drift

Stress insensitivity

Reverse output polarity protection

3.8 V to 24 V operation

On-board voltage regulator

Solid state reliability

Wide operating temperature range

(-40C to +150C)

Field programmable switch points

Robust ESD and EMC capabilities


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Position Senso


ABS Applicatio

RegTo AllSubcircuits

AMP

Gain

Filter Out

Offset

DynamicOffset

Cancellation

TrimControl

Output

Pin 3

GNDPin 2

SupplyPin 1

0 2 4 6 8

Position [mm]

Voltage

Output

4

3

2

1

SOT23W Package

The A1321/A1322/A1323devices are the

first linear Hall-effect sensors available in the

miniature SOT23W package. They will be

offered in three sensitivity ranges; 2.5 mV/G,

3.125 mV/G, and 5 mV/G. The features of this

linear family are ideal for use in linear and

rotary position sensing systems in harsh

environments of automotive and industrial

applications over extended temperatures to

40C and 150C. End-of-line programmability

allows for tight specifications. This new

family of DABIC 5 factory programmable

linear sensors replaces Allegros existing

family of chopper-stabilized standard linear

devices (A3515 and A3516).

Coming soon:

A3525, Programmable Linear (limited)

A1321/A1322/A1323Miniature Linear

Hall-Effect Sensors

Key Features and Benefits: Temperature-stable quiescent

output voltage

Precise recoverability after

temperature cycling

Output voltage proportional

to magnetic flux

Density

Ratiometric rail-to-rail output

Improved sensitivity

4.5 V to 5.5 V operation

Immune to mechanical stress

Solid-state reliability

Robust EMC protectionFunctional Block Diagram

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ABS Applications

Position Sensors


Clock/Logic

AMP S/H LPF

To AllSubcircuits

Output

Ground

Supply

Reg

Output Off

OutputOn

6V Max

O

utputVoltage

Magnetic Flux

0-8 0 +8

RPN

RPN

RPS

RPS

The A3245/46integrated circuits are

omnipolar, ultra-sensitive Hall-effect switches

with digital outputs. These sensors are espe-

cially suited for operation over extended

temperature ranges to +150C. Superior

high-temperature performance is made

possible through Allegro patented dynamic

offset cancellation, which reduces the residual

offset voltage normally caused by device over

molding, temperature dependencies, and

thermal stress. The patented omnipolar feature

allows operation with either a north or a south

pole of sufficient strength turning the output

on; in the absence of a magnetic field, the

output is off. The magnet polarity indepen-

dence allows this device family to easily

replace reed switches for superior reliability

and ease of manufacturing, while eliminating

the requirement for signal conditioning.

Also available: Micropower A3212, Ultra-Slim MLP

A3245/A3246Omnipolar Digital Switches

with On-Chip Regulator

Key Features and Benefits: Less sensitive to physical stress

(chopper stabilization)

Superior temperature stability

North and south pole operationfor simplified manufacturing

Wide voltage operation (3.6 V 24 V)

SOT23W package available

Robust ESD capability


Output short circuit protection

Single-pole or ring magnet applications


UA Package

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Position Senso

ABS Applicatio

DynamicOffset

Cancellation

ProgrammableTrim

Regulator

OutputDrive

AMP Sample& Hold/LPF

Supply

Output A

DynamicOffset

Cancellation

OutputDrive

AMP Sample& Hold/LPF

Output B

4-Bits

8-Bits

4-BIts

Ground

MagneticField

Sensor A

MagneticField

Sensor B

OutputSensor A

OutputSensor B

Quadrature Output

The A3425dual-output Hall-effect sensor

is specifically designed for high-resolution

ring magnet encoder applications. The sensor

consists of two sensitive Hall-effect switches,

with elements 1 mm apart to provide

accurate detection of the magnet zero-

crossings. When used with an appropriately-

dimensioned magnet, quadrature signals

are generated which can be used for

decoding absolute position. Photolitho-

graphic alignment of the elements

eliminates the mechanical stack-up

tolerances experienced with two discrete

elements. Factory programming allows for

precise matching of the two comparator

outputs over a wide temperature range.

The A3425 is available in a four lead K

package and eight lead SOIC-8.

Also available:

A3422

, Speed and Direction Sensor,A328x, Latch Family, A324x, Switch Family

A3425Dual Output Ring Magnet

Position and Speed Sensor

Key Features and Benefits: Two matched bipolar switches

on one substrate

1 mm Hall element spacing

Output short-circuit protection

Operation from unregulated supply



Integrated ESD protection on

outputs and supply

Wide operating temperature range

(-40C to +150C)


SOIC-8Package

K Package

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Position Sensors


DynamicOffset

Cancellation

Sample& Hold Latch

Switch

TimingLogic

Output

Ground

Supply

LPFAMP

Allegros micro-power family of omnipolar

digital switches consist of ultra-sensitive, pole

independent Hall-effect switches with a

latched digital output. These devices are

especially suited for the detection of

open-closed positions in battery-operated,

hand-held equipment such as cellular and

cordless telephones, pagers, and laptop

computers. All three devices incorporate a

unique clocking scheme, which reduces the

average operating power requirements.

The patented omnipolar feature simplifies

application assembly by allowing the device

to detect the presence or absence of a

magnetic field, irrespective of the magnets

polarity. These devices are offered in a single

inline (UA) package, a SOT23W surface

mount package, and an ultra-slim micro

leadframe package (MLP). The A3213

and A3214 devices feature 2.4 V to 5.5 V

operation. These sensors are suited foroperation over extended temperature

ranges to +150C.

Also available:

A3245/A3246, 3.6 V to 24 V Omnipolar Switches

A3212/A3213/A3214Micropower Omnipolar

Digital Switches

Key Features and Benefits: 5 uA nominal current consumption

Operate with north or south pole

2.4 V to 5.5 V battery operation available

Chopper stabilized,high sensitivity thresholds

Superior temperature stability

Extremely low switch-point drift

Insensitive to physical stress

ESD protected to 5 kV


Available in MLP package

Easily manufacturable with

magnet pole independence


MLPPackage

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Current Sensor

DynamicOffset

Cancellation OutAMP Filter

GroundPin 2

OutputPin 3

Supply& TrimPin 1

Pin 5

Pin 4

The Allegro ACS750 family of current

sensorsprovides economical and precise

solutions for current sensing in industrial,

commercial, automotive, and communications

systems, packaged for easy implementation.

The sensor consists of a precision linear Hall IC

optimized to an internal magnetic circuit to

increase device sensitivity. The power lead

frame used for current sensing is designed

for extremely low power loss. The power

terminals are also electrically isolated from

the sensor leads. This allows the ACS750

family of sensors to be used in applications

requiring electrical isolation without the

use of opto-isolators or other costly

isolation techniques.

Versions available:

ACS750(S/L)CA-050, 50 A Sensor

ACS750(S/L)CA-075, 75 A Sensor

ACS750(S/E)CA-100, 100 A Sensor

ACS750XCAFamily of Linear Output

Hall-Effect Current SensorsApplications: Industrial systems

Automotive systems

Motor control

Servo systems

Power distribution

Battery monitors

Connector protection

Key Features and Benefits: Monolithic Hall IC for high reliability

Single +5 V supply

Isolation voltage 2500 V

Full automotive temperature range

available (-40C 150C)

No trimming required in the application

Ultra-low power loss: resistance = 120

Ratiometric output from supply voltage

Very low thermal drift of offset voltage


CAPackage

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HES/br-503-5M

Visit us at www.allegromicro.com/hall/catalog

North America / Far East / Japan

Allegro MicroSystems, Inc.115 Northeast CutoffWorcester, MA 01606 USA

email: [email protected]

Europe

Allegro MicroSystems Europe, Ltd.Balfour House, Churchfield RoadWalton on Thames, GB KT12 2TD

email: [email protected]

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Hall Catalog 200305

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