iC-SM2L

LINEAR AMR SENSOR (2 mm)

Rev A2, Page 2/5

DESCRIPTION

iC-SM2L is a linear position sensor which operates on the AMR effect (anisotropic magneto resistance) and

has been designed to work with magnetic scales which have a N/S pole pitch of 2 mm.

When the sensor is moved along a magnetic scale with a N/S pole pitch of 2 mm the two Wheatstone bridges

generate differential sinusoidal output voltages (PSIN - NSIN) and (PCOS - NCOS) phase-shifted at 90°. One

sine/cosine cycle averaged using a pair of N/S poles is thus produced for a pole width. The absolute magnetic

field strength must be large enough for the sensor to go into saturation and for the magnetization of iC-SM2L's

resistor stripes to assume the direction of the outer magnetic field.s

The amplitudes of the differential output voltages are largely independent of the magnetic field strength and

thus not sensitive to changes in distance.

iC-SM2L is resistant to strong magnetic fields and not sensitive to external homogenous magnetic fields.

CHIP LAYOUT

PAD FUNCTIONS

Nr.

Name

Function

1

NCOS

Output Cosine -

2

NSIN

Output Sine -

3

VB

Supply Voltage Sine/Cosine Bridge

4

GND

Ground

5

PCOS

Output Cosine +

6

PSIN

Output Sine +