TLE4943C datasheet(16/48 Pages) INFINEON

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TLE4943C

Data Sheet

V 1.2, July 2018

2.7.4

Protocol for High Speed

For higher speeds the data protocol is shortened (last bits are cut off). The table below shows how many bits are

transmitted at different signal frequencies. The serial data protocol is shortened at high speeds, because the time

to the next speed pulse is shorter than the protocol cycle. The data bits at the end are therefore "cut off". In each

speed range, the maximum possible number of bits of additional information are transferred.

The output of partially transmitted bits called “bit stumps” are suppressed. See also Chapter 2.7.6. The shortening

of the protocol does not result in any "bit stumps" (bits which have not been completely transferred). This means

that the bits affected by the shortening in any case will be transmitted completely, means, a bit which has been

started must also be transferred to the end. Instead of the bits affected by the shortening, the current level Ilow must

be output. The suppression of bit stumps does function reliably in all speed ranges and in all regular operating

states of the sensor, i.e. also in the standstill protocol. This ensures that no compatibility problems occur in any

regular operating cases caused by e.g. EMC.

Note: Frequencies in brackets are according AK specification

Table 2

Transmitted bits at electric signal frequency

Electric Signal frequency1)

1) Note: electric signal frequency is equal to two times of magnetic frequency

Typical Number of data bits transmitted

< 1818Hz (1800Hz)

9 (bit0 - bit8)

< 2000 Hz (2000Hz)

8 (bit0 - bit7)

< 2222 Hz (2200Hz)

7 (bit0 - bit6)

< 2500 Hz (2400Hz)

6 (bit0 - bit5)

< 2857 Hz (2800Hz)

5 (bit0 - bit4)

< 3333 Hz (3200Hz)

4 (bit0 - bit3)

< 4000 Hz (4000Hz)

3 (bit0 - bit2)

< 5000 Hz (5000Hz)

2 (bit0 - bit1)

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