TLE4942-1C Datasheet, PDF (17/31 Pages) Infineon Technologies AG – Differential Two-Wire Hall Effect Sensor-IC

TLE4942-1C
If the magnetic differential field exceeds ΔB_EL, the output pulse lengths are 90 µs or
180 µs respectively, depending on the direction of rotation.
When the magnitude of the magnetic differential field is below ΔB_EL, the output pulse
lengths are 360 µs and 720 µs respectively, depending on left or right rotation. Due to
decreasing cycle times at higher frequencies, these longer pulses are only output up to
frequencies of approximately 117 Hz. For higher frequencies and differential magnetic
fields below ΔB_EL, the output pulse lengths are 90 µs or 180 µs respectively.
If the magnitude of the magnetic differential field is below B Δ , _Warning the output pulse
length is 45 µs. The warning output is dominant, this means that close to the limit airgap
the direction and the assembly position information are disabled.
For magnitudes of the magnetic differential field below ΔB_Limit, signal is lost.
In case no magnetic differential signal is detected for a time longer than the stand still
period T_Stop, the stop pulse is output. Typically with the first output stop pulse, the circuitry
reverts to the uncalibrated mode.
Data Sheet
18
V 4. 0, February 2010