TLE5014 datasheet(33/45 Pages) INFINEON

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Synchronisation

Frame

Status Nibble

Data Nibble 1

Data Nibble 3

Data Nibble 2

tlow

Final Datasheet

Rev. 1.0

2018-04-04

TLE5014

Interfaces

The nibble low time tlow can be configured to be 3UT or 5UT. This can reduce the overall frame length. The low

time includes the fall time of the edge, therefore it has to be ensured that the fall time of the edge is fast

enough to reach the low level within the configured low time (Figure 4-9).

Note: A nibble low time of 3UT is not compliant with the SENT standard SAE J2716 JAN2010.

Figure 4-9 SENT nibble low time

Rolling counter

This 8bit counter counts the number of transmitted frames with rollover back to 0 and increment with each

message. This counter is for verification in the ECU that no frame is missed or that no frame is sent repeatedly

from the sensor. The rolling counter nibbles are sent after the 3rd data nibble.

SENT data range and error indication

There are two options for the data range and error indication.

• 0°... 360° are mapped to 12bit, i.e. 0... 4095. This information is coded in the three data nibbles. In case of

an internal chip error or a start-up error (BIST error), the status bit [0] of the status nibble is set. An angle

value is transmitted but might not be valid due to the occurred error.

• 0° ... 360° are mapped to 1 ... 4088. In case of an internal sensor error or start-up error (BIST error), the

message “4091” is transmitted and the status bit [0] of the status nibble is set. In case the sensor performs

a reset, the first transmitted status nibble has the status bit [0] set but a valid angle value (within the range

0... 4088) is transmitted with the 3 data nibbles.

4.4.1

Checksum Nibble Details

The checksum nibble is a 4-bit CRC of the data nibbles and is not including the status nibble. The CRC is

calculated using a polynomial x4+x3+x2+1 with a seed value of 0101B. The remainder after the last data nibble

is transmitted as CRC.

4.4.2

SENT Features

Pause Pulse

There is an optional pause pulse which can be activated or deactivated via corresponding bits in the EEPROM.

The pause pulse is implemented in a way that the total frame length is adjusted to 282UT (for option with 6

data nibbles, single secure sensor) or 203UT (3 data nibbles, standard sensor).

Table 4-10 Structure of SENT status nibble

Bits

Description

[0] LSB

error indication or start-up (BIST) error or sensor reset

[1]

reserved

[2]

short serial message bit (data bit)

[3] MSB

short serial message bit (start indication)

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