Data Sheet

6

V 1.1

2017-10

TLE5309D

Dual GMR/AMR Angle Sensor

Functional description

AMR sensor

The output signal of an AMR bridge is unambiguous in a range of 90°. Therefore two bridges are oriented at an

angle of 45° to each other to measure 180°.

Figure 4

Sensitive bridges of the AMR sensor (bottom die)

Note:

In Figure 4, the size of the sensitive areas is greatly exaggerated for better visualization.

With the trigonometric function ARCTAN2, the true 180° angle value that is represented by the relation of X and

Y signals can be calculated according to Equation (2). The AMR sensing element internally measures the

double angle, so the result has to be divided by 2. At external magnetic angles

angle measured by the sensor is

(2)

Figure 5

Ideal output of the AMR sensor bridges

0°

N

S

90°

GND

V

Y

V

Angle

α

90°

180°

0°

45°

135°