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TLI5012 Datasheet(PDF) 9 Page - Infineon Technologies AG |
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TLI5012 Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 44 page TLI5012 Functional Description Target Data Sheet 9 V 0.41, 2009-03 2 Functional Description 2.1 General The GMR sensor is implemented using vertical integration. This means that the GMR sensitive areas are integrated above the logic portion of the TLI5012 device. These GMR elements change their resistance depending on the direction of the magnetic field. Four individual GMR elements are connected to one Wheatstone Sensor Bridge. These GMR elements sense one of two components of the applied magnetic field: • X component, Vx (cosine) or the • Y component, Vy (sine) The advantage of a full-bridge structure is that the amplitude of the GMR signal is doubled and temperature effects cancel out each other. Figure 1 Sensitive Bridges of the GMR Sensor Note: In Figure 1, the arrows in the resistors symbolize the direction of the Reference Layer, which is used for the further explanation. The output signal of each bridge is only unambiguous over 180° between two maxima. Therefore two bridges are orientated orthogonally to each other to measure 360°. With the trigonometric function ARCTAN, the true 360° angle value can be calulated which is represented by the relation of X and Y signals. Because only the relative values influence the result, the absolute size of the two signals is of minor importance. Therefore, most influences to the amplitudes are compensated. VDD GND ADCX+ GMR Resistors ADCX-ADCY+ADCY- VX VY 90° 0° N S |
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