Data Sheet

21

1.10

2018-09-13

TLE4929C Crankshaft Sensor

Fully Programmable Crankshaft Sensor

• No false rotational direction information

Combining the System Watchdog and the Stop Start Watchdog an immunity to vibration can be added to the

Stop-Start-behavior.

Further details are available on request.

3.8

High Speed Mode

The high speed mode can be switched on or off by EEPROM bit “HIGH_SPEED”. Switched to state “off” the

TLE4929x behaves as described. Switched to state “on” the TLE4929x stops direction detection above a

certain input signal frequency of typicaly 1.8kHz and continues with the last detected direction. To switch to

high speed mode the frequency has to be measured two times. Comming from high frequencies the direction

detection is enabled again going below the frequency threshold of 1.5kHz.

In mode TSS = 1 the limits are 4.3kHz and 4.0kHz. All values are typical values.

3.9

Serial Interface

The serial interface is used to set parameter and to program the sensor IC, it allows writing and reading of

internal registers. Data transmission to the IC is done by supply voltage modulation, by providing the clock

timing and data information via only one line. Data from the IC are delivered via the output line, triggered by

as well clocking the supply line. In normal application operation the interface is not active, for entering that

mode a certain command right after power-on is required.

A detailed interface document (TLE4929Cx/59x EEPROM Programming Guide) is available on request,

containing description of electrical timing and voltage requirements, as well as information about data

protocol, available registers and addresses.