AN3258

HSI calibration

Doc ID 17825 Rev 1

13/16

1.7

LIN clock deviation

LIN clock deviations may be caused by the following sources:

1.

Deviation due to transmitter error (DTRA): The transmitter can be either a master or a

slave (in the case of a slave listening to the response of another slave).

2.

Error due to the LIN synch measurement performed by the receiver (DMEAS).

3.

Error due to the baud rate quantization of the receiver (DQUANT).

4.

Deviation of the local oscillator of the receiver (DREC): This deviation can occur during

the reception of one complete LIN message assuming that the deviation was

compensated at the beginning of the message.

5.

Deviation due to the transmission line (DTCL) which is generally due to the

transceivers.

Total clock deviation = DTRA + DMEAS + DQUANT + DREC + DTCL

If the LINUART is to receive a character correctly, the total deviation should be <3.75 %. For

more details, please refer to the STM8A (RM0009) and STM8S (RM0016) reference

manuals.