The ATS610LSA and ATS611LSB gear-tooth sensors are opti-

mized Hall IC plus magnet modules that provide a user-friendly solu-

tion for digital gear-tooth sensing applications. Each module combines

in a compact high-temperature plastic package, a samarium-cobalt magnet, a

pole piece, and a differential Hall-effect IC that has been optimized to

the magnetic circuit. These sensors can be easily used in conjunction

with a wide variety of gear or target shapes and sizes.

The ATS610LSA is designed to provide increased immunity to

false switching in applications that require the sensing of large-tooth

gears (e.g., crank angle or cam angle). The ATS611LSB is optimized

to sense fine-pitch gears over large working air gaps (e.g., transmis-

sion or ABS). These sensors are ideal for use in gathering speed,

position, and timing information using gear-tooth-based configurations.

The gear-sensing technology used for these sensor plus magnet

modules is Hall-effect based. The sensor incorporates a dual-element

Hall IC that switches in response to differential magnetic signals

created by the ferrous target. The circuitry contains a patented

track-and-hold peak-detecting circuit to eliminate magnet and system

offset effects. This circuit has the ability to detect relatively fast changes,

such as those caused by gear wobble and eccentricities, and provides

stable operation at extremely low rotation speeds.

Always order by complete part number, e.g., ATS610LSA .

continued next page…

FEATURES AND BENEFITS

s

Fully Optimized Differential Digital Gear-Tooth Sensor

s

Single-Chip Sensing IC for High Reliability

s

Extremely Low Timing Accuracy Drift with Temperature

s

Large Operating Air Gaps

s

Small Mechanical Size

s

Optimized Magnetic Circuit

s

Patented Peak-Detecting Filter:

<200

µs Power-On Time

<10 RPM Operation (single-tooth target)

Correct First-Edge Detection

Uses Small Value Ceramic Capacitors

s

Under-Voltage Lockout

s

Wide Operating Voltage Range

s

Defined Power-Up State

Dwg. AH-006

1

2

3

4

Pin 1 = Supply

Pin 2 = Output

Pin 3 = Capacitor

Pin 4 = Ground

DYNAMIC, PEAK-DETECTING, DIFFERENTIAL

HALL-EFFECT GEAR-TOOTH SENSORS

ABSOLUTE MAXIMUM RATINGS

over operating temperature range

Minimum External Capacitance,

Package Power Dissipation,

Operating Temperature Range,

* Operation at increased supply voltages with

external circuitry is described in Applications

Information. Devices for operation at increased

temperatures are available on special order.

ATS611LSB