ATS672LSB

Preliminary – Subject to Change

PIN OUT DIAGRAM

Self-Calibrating TPO Gear-Tooth Sensor with

9-Bit Signal Capture

4 3 2 1

Pin 3: Test Pin (Tie to GND)

Pin 4: Gnd

The ATS672LSB true zero-speed gear-tooth sensors are

optimized Hall IC/magnet configurations packaged in a single in-

line package (SIP) that provides a user-friendly solution for digital

gear-tooth-sensing applications. The SIP 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 single-element Hall IC that switches

in response to magnetic signals created by a ferrous target. The

IC contains a sophisticated digital circuit designed to eliminate the

detrimental effects of magnet and system offsets. 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 (reduced vibration sensitivity). High-

resolution (9-bit) 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 (such as magnetic overshoot).

The ATS672LSB also includes a low-bandwidth filter that

increases the noise immunity and the signal-to-noise ratio of the

sensor. These features result in potential improvements in both

the timing accuracy and the jitter performance of the device. The

ATS672LSB sensor system is optimized for cam applications.

Four versions of this device are available. The sensor can be

chosen to have a high or low output signal in response to a “tooth”.

The sensor is also available with and without TPOS (true power on

state) capability. The low-on-tooth sensor without TPOS is

available through general sales. (Part # ATS672LSB-LN). For

other versions please contact the factory. Some restrictions may

apply.

ABSOLUTE MAXIMUM RATINGS

Supply Voltage,

Reverse Supply Voltage,

Reverse Current Through Output,

Continuous Output Current,

Storage Temperature,

Package Power Rating,

Maximum Junction Temperature,

Maximum Junction Temperature – 100 Hours,

FEATURES

Tight timing accuracy over temperature

True zero-speed operation

True power-on sensing

Air gap independent switch points

High vibration immunity

Large operating air gaps

Operation down to 3.3 V

Digital output representing target profile

Single-chip solution for high reliability

Small mechanical size

Optimized Hall IC magnetic system

AGC and reference-adjust circuit

Undervoltage lockout