TLE4955C-E4 Datasheet, PDF (8/24 Pages) Infineon Technologies AG – Differential Hall Effect Transmission Speed Sensors

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TLE4955C-E4
Operating Modes and States
I_DD
I_High
I_Low
∆B_speed
Phase shift change
uncalibrated mode
vs . calibrated mode
Vibration Suppression
via Hysteresis
Vibration Suppression
via Direction Detection
t
DNC:
2xdBspeed-limit^max1
min1
DNC=(min1+ max1)/2
DNC=( min2+max1)/2
Hysteresis high level
t
Hysteresis low level
Figure 4
min2
Uncalibrated Speed Signal
with negative offset
Uncalibrated Speed Signal
with positive offset
Calibrated Speed Signal
Example for Startup Behavior and Transition from Uncalibrated into Calibrated Mode
2.2
Adaptive Hysteresis
The adaptive hysteresis is linked to the input signal. Therefore the system is able to suppress switching if
vibration or noise signals are smaller than the adaptive hysteresis levels. The typical value for the hysteresis
level is 1/8 of the magnetic input signal amplitude, the minimum hysteresis level is ΔB_speed-limit (amplitude).
The visible hysteresis keeps the excellent performance in large pitch transmission application wheels .
∆B_speed
Input signal
Adaptive hysteresis
Input signal
Adaptive hysteresis
Hysteresis high level
t
Hysteresis low level
Figure 5 Adaptive Hysteresis
Data Sheet
8
Version 1.00
2016-06-01