Dual Output Narrow Pitch

Differential Speed and Direction Sensor IC

A17502

8

Allegro MicroSystems

955 Perimeter Road

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

www.allegromicro.com

REFERENCE

Definition of Terms

TCYCLE

Target

BDIFF

TCYCLE

N

S

N

SS

Figure 1: Definition of TCYCLE

TCYCLE = Target Cycle; the amount of rotation that moves one tooth and valley across the sensor.

BDIFF = The differential magnetic flux density sensed by the IC.

Differential Magnetic Input

BDIFF(max)

BDIFF(min)

Time

BDIFF

BDIFF

BDIFF(pk-pk)

Figure 2: Differential Magnetic Input

BDIFF(pk-pk) = The peak-to-peak magnetic flux density sensed by the IC.