Introduction to the LIN bus

AN4101

6/21

Doc ID 23127 Rev 1

2.3

LIN frame

LIN is based on the standard UART format, with 1 start bit, 8 data bits (LSB first), and 1 stop

bit.

Figure 1.

LIN frame

The LIN frame is composed of a header and a response.

The header consists of:

●

the Break field

●

the Synch field

●

the Protected Identifier field

The response consists of:

●

from 1 to 8 bytes of data

●

1 checksum byte

Figure 2.

LIN frame header and response

The header is always sent by the master node. The response is sent by only one node:

either the master node, or one of the slave nodes.

The node sending a frame response is called the publisher. There is always only one

publisher for each frame.

A node interested in a frame response is called a subscriber. There can be several

subscribers for a frame.

MSv31513V1

Byte field

Start

bit

LSB

(bit 0)

MSB

(bit 7)

Stop

bit

MSv31514V1

Frame

Header

Response

Response space

Break

field

Sync

field

Protected

identifier

field

Inter-byte space

Inter-byte spaces

Data 1

Data 2

Data N

Checksum