ATS665LSG

True Zero Speed,

High Accuracy, Gear Tooth Sensor

Pin 3: Tie to Gnd or Float

Pin 4: Gnd

The ATS665 true zero-speed gear tooth sensor is an optimized

Hall IC/magnet configuration packaged in a molded module that

provides a user-friendly solution for digital gear tooth sensing

applications.

The sensor module consists of an over-molded

package, which holds together a samarium cobalt magnet, a pole

piece and a true zero-speed Hall IC that has been optimized to the

magnetic circuit. This small package can be easily assembled and

used in conjunction with gears of various shapes and sizes.

The sensor incorporates a dual element Hall IC that switches in

response to differential magnetic signals created by a ferrous

target.

The IC contains a sophisticated compensating circuit

designed to reduce 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.

This sensor’s ability to provide tight duty cycle at high speeds

and over a wide temperature range makes it ideal for transmission

and industrial speed applications. The ATS665 is available in the

SG package in the automotive temperature range, -40° to 150° (L).

ABSOLUTE MAXIMUM RATINGS

Supply Voltage

1,

Reverse Supply Voltage,

Reverse Output Current

2,

Continuous Output Current,

Ambient Operating Temperature Range,

Storage Temperature,

Maximum Junction Temperature,

Maximum Junction Temperature – 100 Hours,

FEATURES & BENEFITS

True zero-speed operation

Switchpoints independent of air gap

High vibration immunity

Precise duty cycle signal over operating temperature range

Large operating air gaps

Defined power-on state

Wide operating voltage range

Digital output representing target profile

Single-chip sensing IC for high reliability

Small mechanical size

Optimized Hall IC magnetic system

200

µs power-on time at gear speed < 100 rpm

AGC and reference adjust circuit

Under-voltage lockout

Use complete part number when ordering: ATS665LSG.