Data Sheet

18

1.10

2018-09-13

TLE4929C Crankshaft Sensor

Fully Programmable Crankshaft Sensor

Figure 10

Adaptive Hysteresis

3.5

Rotational Direction Definition and Edge Polarity Definition

TLE4929C has EEPROM-options to change the position of the output-protocol. In the application the switching

point is either the middle of the tooth or the middle of the notch (magnetic encoder wheel: middle of north

pole or middle of south pole). From magnetic point of view it is zero crossing of the differential speed signal:

Either rising edge or falling edge. The EEPROM-Bit “EDGE_POLAR” parametrizes the sensor to one of the

edges.

In addition there is an option to issue “forward”-pulses either in CW rotational direction or CCW rotational

direction: “FORWARD_DEF”.

Both EEPROM-bits are independent from each other.

Figure 11

Signal output in setting “EDGE_POLAR = 0” and “FORWARD_DEF” = 0

-10

-8

-6

-4

-2

0

2

4

6

8

10

0

0.01

0.02

0.03

0.04

0.05

0.06

0.07

time [s]

Hysteresis = 0.25 *

ΔBpp (peak to peak )

ΔBz,diff

magnetic input signal

hysteresis HI

hysteresis LO

Speed

Direction

Rotation direction CW:

Output „Q“

CW

Rotational

Change