OPTIREG™ SBC TLE9274QXV33
LIN transceiver
9.2.1
LIN OFF mode
The LIN OFF mode is the default mode after power-up of the SBC. It is available in all SBC modes and is
intended to completely stop LIN activities or when LIN communication is not needed. In LIN OFF mode, a
wake-up event on the bus will be ignored.
9.2.2
LIN Normal mode
The LIN transceiver is enabled via SPI in SBC Normal mode. LIN Normal mode is designed for normal data
transmission/reception within the LIN network. The mode is available only in SBC Normal mode.
Transmission
The signal from the microcontroller is applied to the TXDLIN input of the SBC. The bus driver switches the
LIN output stage to transfer this input signal to the LIN bus line.
Enabling sequence
The LIN transceiver requires an enabling time tLIN,EN before a message can be sent on the bus. This means that
the TXDLIN signal can only be pulled LOW after the enabling time. If this is not ensured, then the TXDLIN needs
to be set back to HIGH (= recessive) until the enabling time is completed. Only the next dominant bit will be
transmitted on the bus. Figure 26 shows different scenarios and explanations for LIN enabling.
VTXDLIN
t
LIN
Mode
t
t LIN,EN
t
LIN,EN
LIN,EN
LIN
NORMAL
LIN OFF
t
t
V
LIN_BUS
Recessive
Dominant
recessive TXDLIN level
required bevore start of
transmission
recessive TXDLIN
level required
tLIN, EN not ensured, no
transmission on bus
tLIN, EN not ensured,
no transmission on bus
Correct sequence,
Bus is enabled aftertLIN,
EN
LIN_enabling_sequence.vsd
Figure 26 LIN transceiver enabling sequence
Reduced electromagnetic emission
To reduce electromagnetic emissions (EME), the bus driver controls LIN slopes symmetrically. The
configuration of the different slopes is described in Chapter 9.2.8.
Reception
Analog LIN bus signals are converted into digital signals at RXDLIN via the input receiver.
Datasheet
63
Rev.2.0
2022-05-06
INFINEON [ Infineon ]
