TLE8080EM Datasheet, PDF (21/39 Pages) Infineon Technologies AG – Engine Management IC for Small Engines

TLE8080EM
Variable Reluctance Sensor ( VRS ) Interface
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.
VR_IN1
VR_IN2
Clamp
&
Load
Select Load
2,5V
Buffer
Figure 11 VR Sensor Interface Block Diagram
Detection
VR_OUT
Select Threshold
Data Sheet
21
Rev. 1.1, 2012-10-19