Description

TheATS601LSG is a unique addition to theAllegro™ camshaft

sensor IC family of products. As a single element, defined

power–onstate,sensorIC,itprovidesfirstfallingedgedetection,

high running mode edge accuracy, and direction/orientation

insensitivity over the full operating range of air gap, speed,

and temperature. The ATS601LSG consists of an optimized

Hall IC and a simple magnetic pellet configuration.

The single element Hall IC and magnetic pellet configuration

switches in response to magnetic signals created by a

ferromagnetic target. The IC contains a low bandwidth filter

that increases the noise immunity and the signal–to–noise ratio

of the sensor IC. Sophisticated digital circuit design eliminates

the detrimental effects of target geometry discontinuity, magnet

and system offsets, and thermal gradients. Signal processing

is used to provide zero speed performance independent of air

gap and also to dynamically adapt device performance to the

typical operating conditions found in automotive applications,

particularly camshaft sensing.The resulting output of the device

is a digital representation of the ferromagnetic target profile.

A number of factory programmable options allow for

performance optimization to meet specific application

requirements.

The ATS601 is provided in a 4–pin SIP package (suffix SG)

that is lead (Pb) free, with 100% matte tin leadframe plating.

ATS601LSG–DS

Features and Benefits

• Digital output representing target profile

• Single Hall element for twist–insensitive mounting and

direction insensitive polarity

• True zero–speed operation

• Defined power-on state

• Air gap independent switchpoints

• Chopper stabilized

• Operation down to 3.3 V

• Factory programmable options:

▫ Output polarity: low or high opposite tooth

▫ Startup hysteresis: 40 G or 80 G

▫ Threshold location: 30% or 50% from signal peak

▫ Threshold update: single tooth (continuous) or four–

tooth memory

• Fully synchronous digital logic with Scan Path and IDDQ

testing

Single Element, Tooth Detecting

Speed Sensor IC

Package: 4–pin SIP (suffix SG)

Functional Block Diagram

ATS601LSG

Not to scale

Internal Regulator

(Analog)

Internal Regulator

(Digital)

VCC

Current

Limit

OUT

GND

Multiplexed Test

Signals

Synchronous

Digital Controller

Tooth Detection

Offset Control

Application Trim

Stop Mode Timer

TEST

Hall

Amplifier

Offset

Adjust

Chopper

Stabilization

ADC

Low Pass

Filters

Temperature

Compensation