TLE8080EM

Variable Reluctance Sensor ( VRS ) Interface

Data Sheet

21

Rev. 1.1, 2012-10-19

7

Variable Reluctance Sensor ( VRS ) Interface

The variable reluctance (VR) sensor interface converts an output signal of a VR sensor into a logic level signal

suited for µC 5V input ports. The voltage difference between the two input pins, VR_IN1 and VR_IN2, which are

connected to the two output pins of the VR sensor, is detected and the output pin VR_OUT is switched depending

on the sign of the voltage difference ( see Figure 12 )The amplitude of the VR sensor signal is limited by an internal

clamping circuit to avoid damage of the device due to over voltage caused by the VR sensor signal.

Figure 11

VR Sensor Interface Block Diagram

Clamp

&

Load

Detection

VR_OUT

2,5V

Buffer

Select Load

Select Threshold

VR_IN1

VR_IN2