TLE4941-1C
Description
TLE4941-1 TLE4941-1C d1 d1
Initial
Setting d2
Time d2 Offset Corection d2
PGA Switching
Uncalibrated Mode
Phase Shift Change
Calibrated Mode
= Peak Detection Offset = (max + min) / 2
AED03204
Figure 1 Example for Start-up Behavior
Uncalibrated Mode
Occasionally a short initial offset settling time td,input might delay the detection of the input signal (the sensor is “blind”).
The magnetic input signal is tracked by the speed ADC and monitored within the digital circuit. For detection the signal transient needs to exceed a threshold (digital noise constant d1). When the signal slope is identified as a rising edge (or falling edge), a trigger pulse is issued to a parator. A second trigger pulse is issued as soon as a falling edge (or rising edge respectively) is detected (and vice versa).
Between the start-up of the magnetic input signal and the time when its second extreme is reached, the PGA (programmable gain amplifier) will switch to its...
