Note:

For more information about the warning bit and the error indication bit please consult the TLE49SR user

manual.

Checksum nibble details

The checksum nibble is a 4-bit CRC of the data nibbles. Optionally the status nibble can be included by register

setting. 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.

Short serial message

The short serial message is an additional option which can be enabled and disabled. The short serial message

provides additional information in the status nibble by transmitting an 8 bit temperature value, and a 52 bit user and

sensor ID.

1 short serial message will be constructed out of 16 SPC frames. In each SPC frame, one bit of information is

transmitted in bit [0] of the status nibble and has following structure:

•

4 bit message ID

•

8 bit data

•

4 bit CRC (calculated from message ID and data bits)

The start of the short serial message is indicated by a “1” in bit [1] of the status nibble. For the next 15 frames, this bit

will contain a “0”.

The message ID is used for identification of the type of data received. All data are transmitted in the bit [0] of the

status nibble in the order MSB to LSB

 

Rolling counter

The rolling 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.

 

Temperature information

Same format as in the SENT chapter, see Temperature information in the SENT Features chapter.

 

SPC frameholder

The SPC frameholder enables multiple sensors on the bus to synchronously measure the sensor value. Without

frameholder function, the sensor sends its response immediately after the trigger pulse when the sensor ID and the

trigger ID are the same. In case the frameholder function is activated all sensors on the bus start an angle

measurement after the trigger pulse and store the measurement result in the memory. Only the addressed sensor

replies immediately after the trigger on the bus is received. All other sensors will respond when the corresponding

sensor ID is polled by a separate trigger pulse.

5.2.4

SICI programming interface

A single wire interface (SICI) which is on the same output pin as the PWM, SENT/SPC output, is implemented. This

interface is used to perform the EEPROM programming with application and customer specific data (angle base, look-

up table, customer-ID). In addition, some chip configuration can be done. More details can be found in the

corresponding user manual.

TLE49SR

Datasheet

5  Specific module descriptions

Datasheet

28

Rev. 1.1.1

2024-03-13