Data Sheet

12

1.10

2018-09-13

TLE4929C Crankshaft Sensor

Fully Programmable Crankshaft Sensor

– starts after supply release

–lasts tpower-on (power-on time)

– IC loads configuration and settings from EEPROM and initializes state machines and signal path

–output is locked HIGH

•Initial phase (Figure 5 ”uncalibrated mode”)

– starts after Power-on phase

– lasts one clock cycle

– IC enables output switching, extrema detection and threshold adaption

• Calibration phase 1 (Figure 5 ”calibrated mode”)

– starts after Initial phase

– lasts until the sensor has observed 3 mangetic edges (maximum 4 magnetic edges) and is able to

perform the most likely final threshold update needed for transition to “Calibration Phase 2”.

– IC performs fast adaptation of the threshold according to the application magnetic field

– initial and second switching (uncalibrated mode)of the output is performed according to the detected

field change of the differential magnetic field

– length of the output-pulse is derived from the center Hall probe (direction signal) sampled at the zero-

crossing of the differential outer Hall probes (speed signal)

– length of the very first pulse is “forward-pulse” according to choosen protocol in EEPROM (direction

information is not valid at this time)

• Calibration phase 2

– starts after “Calibration Phase 1”

– lasts until the sensor has reached final offset-calibration which is minimum 5 teeth / maximum 64 teeth

(pole-pairs) according to choosen alorithm in EEPROM

– IC performs slow and accurate adaptation of the threshold according to the application magnetic field

– output switching (calibrated mode) is performed according to magnetic zero-crossing of the

differential magnetic field

– length of the output-pulse is derived from the center Hall probe (direction signal) sampled at the zero-

crossing of the differential outer Hall probes (speed signal)

• Running phase

– starts after “Calibration Phase 2”

– lasts indefinitely if no special condition is triggered (see Chapter 3.7)

– performs a filter algorithm in order to maintain superior phase accuracy and improved jitter

– output switches according to the threshold value, according to the hidden hysteresis algorithm and

according to the choosen output-protocol