115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

ATS612LSB

DYNAMIC, SELF-CALIBRATING, PEAK-DETECTING,

DIFFERENTIAL HALL-EFFECT GEAR-TOOTH SENSOR

2

FUNCTIONAL BLOCK DIAGRAM

UVLO

SUPPLY

REG

+

–

1

E2

MAGNET

E1

X

X

OUTPUT

Dwg. FH-014-1

GROUND

2

4

CAPACITOR

3

POWER-ON

LOGIC

+

–

TRACK &

HOLD

GAIN

CURRENT

LIMIT

FEATURES AND BENEFITS

■ Fully Optimized Differential Digital Gear-Tooth Sensor

■ Single-Chip Sensing IC for High Reliability

■ Digital Output Representing Target Profile

■ Extremely Low Timing Accuracy Drift with Temperature

■ Large Operating Air Gaps

■ Small Mechanical Size

■ Optimized Magnetic Circuit

■ Patented Peak-Detecting Filter:

80

µs Typical Power-On Time

<10 RPM Operation (single-tooth target)

Correct First-Edge Detection

Uses Small Value Ceramic Capacitors

■ Under-Voltage Lockout

■ Wide Operating Voltage Range

■ Defined Power-On State

600

400

200

40

80

120

160

0

AMBIENT TEMPERATURE IN

°°°°C

Dwg. GH-065-7

60

100

140

180

20

800

1000

°C/W

Copyright © 2001, 2002 Allegro MicroSystems, Inc.