Description

Power-On State (TPOS) sensor IC family, offering improved

accuracy compared to prior generations, and performing at

absolutely zero target speed. An output polarity option allows

customization for specific applications.

The device incorporates a single Hall-element IC with an

optimized custom magnetic circuit that switches in response to

magnetic signals. The resulting output of the device is a digital

representation of a ferromagnetic target profile.

The IC contains a sophisticated digital circuit designed to

eliminatethedetrimentaleffectsofmagneticandsystemoffsets.

Signal processing is used to provide target state recognition

at zero rotational speed, consistent switchpoints regardless

of air gap, and dynamically adapt device performance to the

typical operating conditions found in automotive environments,

particularly cam sensing applications.

High-resolution peak-detecting DACs are used to set the

adaptive switching thresholds of the device. The ATS675 also

includes a filter that increases the noise immunity and the

signal-to-noise ratio of the IC.

The device is provided in a 4-pin SIP package (SE) that is lead

(Pb) free with 100% matte tin leadframe plating.

ATS675LSE-DS, Rev. 2

Features and Benefits

▪ Optimized for automotive camshaft sensing

▪ True target state recognition at device power-on (TPOS)

and at zero target speed

▪ Chopper stabilization reduces offset drift

▪ Digital output polarity option: follow or invert target profile

▪ Rapid calibration and transition to Running mode

▪ Automatic Gain Control (AGC) during calibration

eliminates effects of air gap variations

▪ Tight timing accuracy over full operating

temperature range

▪ Operation at supply voltages as low as 3.3 V

▪ Undervoltage lockout (UVLO)

Self-Calibrating TPOS Speed Sensor IC

Optimized for Automotive Cam Sensing Applications

Package: 4-pin SIP (suffix SE)

Typical Application

Not to scale

ATS675LSE

Figure 1. Operational circuit for the ATS675

ATS675

0.1 μF

VCC

OUT

GND

TEST

Recommended

1

2

4

3

Output

A

A