TLE9262QX Datasheet, PDF (77/163 Pages) Infineon Technologies AG – Dedicated Data Sheets are available for the different product variants

TLE9262QX
LIN Transceiver
11.2.2 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 in SBC Normal Mode and in SBC Stop 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 t_LIN,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 34 shows different scenarios and explanations for LIN enabling.
V _{T XDLI N}
LIN
Mode
LIN
NORMAL
LIN OFF
V_{LIN_ BUS}
Recessive
Dominant
t _LIN,EN
Correct sequence ,
Bus is enabled after t LIN, EN
t _LIN,EN
t
t _LIN,EN
t
tLIN, EN not ensured , no
transmission on bus
recessive TXD level
required bevor start of
transmission
tLIN, EN not ensured ,
no transmission on bus
t
recessive TXD
level required
Figure 34 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 11.2.8.
Reception
Analog LIN bus signals are converted into digital signals at RXD via the differential input receiver.
11.2.3 LIN Receive Only Mode
In LIN Receive Only Mode (RXD only), the driver stage is de-activated but reception is still possible. This mode is
accessible by an SPI command and is available in SBC Normal and SBC Stop Mode.
Data Sheet
77
Rev. 1.1, 2014-09-26