TLE4943C datasheet(41/48 Pages) INFINEON

Part #	TLE4943C

Description	Hall Based Differential Wheel Speed Sensor with AK protocol

PDF	48 Pages

Scroll/Zoom	100%

Manufacturer	INFINEON [Infineon Technologies AG]

Direct Link	http://www.infineon.com

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41 / 48 page

TLE4943C

Data Sheet

V 1.2, July 2018

3.8

Watchdog Reset after Offset Jump

Figure 28

Reset is triggered after watchdog delay time and signal watchdog

When an offset jump, greater than the amplitude of the magnetic speed signal occurs, no zero crossing is passed

anymore and therefore sensor outputs no speed pulse. Instead, standstill protocol is issued. After transmitting five

standstill protocols (typ. 750ms) the signal watchdog starts. If still no speed pulse is output sensor starts to detect

extreme with minimum DNC (digital noise constant). After detecting nswd extreme and still no speed pulse issued,

sensor triggers internal reset and enters uncalibrated mode. Therefore validity of direction, direction information,

validity of airgap and airgap measurement are set to default values. This represents the same status as after

power on. Therefore offset calibration starts again.

Watchdog timer

Signal watchdog

Standstill protocol

Offsetjump

Uncal Mode

Reset

TLE4943C Datasheet(PDF) 41 Page - Infineon Technologies AG