ATS19580LSNBTN-FDIHBO datasheet(11/16 Pages) ALLEGRO

11 / 16 page

Large Air Gap, GMR Transmission Speed and Direction

Sensor IC for Gear Tooth Sensing

ATS19580

Allegro MicroSystems

955 Perimeter Road

Manchester, NH 03103-3353 U.S.A.

www.allegromicro.com

Target Design

The ATS19580 is designed to work with a variety of target shapes

and sizes in addition to the Reference Target 60-0 in this data-

sheet. To determine the operating air gap range for each target, as

well as the suitability for proper direction and vibration detection,

the magnetic profile of each must be analyzed.

Power-On (Calibration)

After power is applied to the sensor IC, the IC internally detects

the magnetic profile of the target. Operation begins with a

calibration period, during which the sensor IC does not provide

direction information; direction pulses are provided once constant

direction of rotation is determined. Depending on the selected

variant, non-directional pulses (tW(ND)) may or may not be pro-

vided during calibration.

Target

Differential

Magnetic

Profile

Target Rotation

tW(FWD) or

tW(REV)

tW(ND)

tW(FWD) or

tW(REV)

tW(FWD) or

tW(REV)

tW(ND)

tW(FWD) or

tW(REV)

Tooth

Valley

Figure 5: Output options after power-on

ATS19580LSNBTN-FDIHBO Datasheet(PDF) 11 Page - Allegro MicroSystems