TLE5041plusC

Functional Description

2

Functional Description

The integrated GMR sensor detects differential magnetic fields in x-direction. Two iGMR sensing elements are

arranged at a distance of 2mm. Their output signals are processed differentially. To detect the motion of objects

the magnetic field must be provided by a magnetized encoder wheel mounted on the rotating axis.

Magnetic offsets and device offsets are cancelled by a self-calibration algorithm. Self-calibration is done after start

up and requires only a short history of magnetic input. After calibration switching occurs exactly at the zero

crossing for sinusoidal signals or generally speaking the arithmethical mean of any magnetic input signal.

Switching is indicated by a high or low supply current level.

2.1

General

The sensor is sensitive to magnetic field gradients in x direction. In Figure 1 the typical placement of the

TLE5041plusC facing a magnetic encoder wheel is shown. The figure also indicates the coordinate system, which

is valid throughout this document. Other sensor positions and encoder wheels are possible, the coordinate system

is therefore related to the sensor. The iGMR structures (sensitive areas) are located at the front side of the

package which is marked.

Magnetic encoder wheel

rotation = X-motion

Y

N S N

S N

X

Sensor location

N S N

S N

X

„air-gap“

z-distance

Sensing elements face the

Z

marked package front

Figure 1

Side read placement of the TLE5041plusC besides a magnetic encoder wheel

Data Sheet

8

V 1.2, 2018-01-18