Description

TheATS667 is a true zero-speed gear tooth sensor IC consisting

of an optimized Hall IC-rare earth pellet configuration in a

single overmolded package.The unique IC and package design

provides a user-friendly solution for digital gear tooth sensing

applications. This small package can be easily assembled and

used in conjunction with gears of various shapes and sizes.

The device incorporates a dual element Hall IC that switches

in response to differential magnetic signals created by a ferro-

magnetic target. The IC contains a sophisticated compensating

circuit designed to eliminate the detrimental effects of magnet

and system offsets. Digital processing of the analog signal

provides zero-speed performance independent of air gap and

also dynamic adaptation of device performance to the typical

operating conditions found in automotive applications (reduced

vibration sensitivity). High-resolution peak detecting DACs

are used to set the adaptive switching thresholds of the device.

Hysteresis in the thresholds reduces the negative effects of any

anomalies in the magnetic signal associated with the targets

used in many automotive applications.

The ATS667 is optimized for transmission applications. It is

available in a lead (Pb) free 4-pin SIP package with a 100%

matte tin plated leadframe.

ATS667-DS, Rev. 2

Features and Benefits

▪ Optimized robustness against magnetic offset variation

▪ Small signal lockout for immunity against vibration

▪ Tight duty cycle and timing accuracy over full operating

temperature range

▪ True zero-speed operation

▪ Air gap independent switchpoints

▪ Large operating air gaps achieved through use of gain

adjust and offset adjust circuitry

▪ Defined power-on state (POS)

▪ Wide operating voltage range

▪ Digital output representing target profile

▪ Single chip sensing IC for high reliability

▪ Small mechanical size

▪ Optimized Hall IC magnetic system

▪ Fast start-up

▪ Undervoltage lockout (UVLO)

True Zero-Speed, High Accuracy Gear Tooth Sensor IC

Functional Block Diagram

ATS667LSG

Not to scale

Package: 4-pin SIP (suffix SG)

GND

VOUT

VCC

TEST

Output

Transistor

Current

Limit

Voltage

Regulator

Hall

Amp

Automatic

Gain

Control

V

PROC

PThresh

NThresh

Threshold

Logic

Threshold

Comparator

Offset

Adjust

Reference

Generator

PDAC

NDAC