TLE4943C datasheet(25/48 Pages) INFINEON

25 / 48 page

TLE4943C

Data Sheet

V 1.2, July 2018

Figure 18

Output triggering in calibrated mode and direction detection

Direction detection

Direction signal is always sampled with the main comparator switching (75us +/-25%) before the sensors output

switching (speed protocol). After two consecutive samples of the direction signal, offset of them is calculated and

then the third sample is compared with the offset value. The direction is given by the sign of the third sample

direction signal and the direction of the edge (rising or falling) of the magnetic speed signal. Using this direction

detection method, detected direction is valid latest with the 4th output speed protocol. GDR bit gives the

information if the detected direction is valid. On TLE4943C the direction detection is valid if the difference between

the two consecutive samples of the direction signal (also used for the calculation of the direction) is greater than

two times dBdirmin and speed signal is four times greater than dBlimit .

Direction detecion

dBdir

min2

min1

max1

dB_dirmin

dBdir = center – (left + right) / 2

Uncalibrated Mode

Calibrated Mode

Phase Shift Change

(min1+max1)/2

2 x dBlimit

min1

max1

Offset

correction

(min2+max1)/2

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