The first part of a LIN transaction, which contains the header
and is followed by a response period where it waits for slave
processes.
Slave Process
The second part of a LIN transaction, in which data is
transmitted on the bus followed by a checksum. The device that initiates the
master process may also be the one that performs the slave process.
Header
The primary section of the master process, which contains the
Break, Delimiter bit, Sync Field, and PID byte.
Response
The section of the LIN transaction in which the master process
relinquishes the bus and one or more slave processes transmit data.
Break
The start of a transaction, at least 13 dominant bits in a row,
followed by a delimiter.
Delimiter
The separation between the break and sync fields consisting of
at least one recessive bit.
Sync
The character following the Break and Delimiter bits, consisting
of the value 0x55, which synchronizes the transmission rate between the
master and the slaves.
PID/Identifier
The last piece of the header. This contains information about
whether the master expects to send or receive data, how much data is to be
sent/received, and which slave(s) will be communicated with. What each
individual identifier means differs for each LIN network, and these
definitions are outlined in a LIN Description File (LDF). The identifier
also includes two Parity bits.
VBAT
Battery voltage of the vehicle. VSUP is derived from
this voltage.
VSUP
Primary voltage of the ECU and LIN transceivers. This can differ
from VBAT due to protection circuitry between the battery and the
actual components.
LDF
The LIN Description File, an ASCII document that contains
detailed information of a LIN bus, including the nodes on the bus, the
signals, and the frames that will be sent on the bus and their meanings.
The online versions of the documents are provided as a courtesy. Verify all content and data in the device’s PDF documentation found on the device product page.
