TLE8263-2E Datasheet, PDF (47/94 Pages) Infineon Technologies AG – Universal System Basis Chip

TLE8263-2E
Confidential
LIN Transceiver
10.5
Failure Detection
All failures are reported in the SPI Diagnostic Encoder except the TxD time-out feature, reported as TxD shorted
to GND and over temperature, which is not reported. In case of failure, the transceiver is automatically switched
to the LIN Receive only mode. The reactivation of the transmitter appears only after the microcontroller has
requested it via SPI, except the over temperature. In this particular case, the transmitter is reactivated after a
transition from dominant to recessive.
10.5.1 TxD Time-out Feature
If the TxD signal is dominant for a time t > t_{TxD_TO}, the TxD time-out function deactivates the transmission of the
signal at the bus. This is done to prevent the bus from being permanently blocked due to an error. The
transmission is released by sending the SPI command for LIN Normal Mode. Refer to Figure 20.
.
TxD_LIN
TxD Time -out
Interrupt
SPI setting : LIN
Normal Mode
VC C1 µC
GND
t
V_BUS
tTxD_TO
Figure 20 TxD Time-out Diagram
t
LIN Txd timeout .vsd
10.5.2 Bus Dominant Clamping
If the LIN bus signal in dominant for a time t > t_{LIN_TO}, a bus dominant clamping is detected. The LIN transceiver
is switched to Receive Only Mode. The failure is signaled via SPI. If the bits are not masked, the INT pin is set to
low. For operation the transceiver needs to be switched back to Normal Mode via SPI.
10.5.3 TxD to RxD Short Circuit Feature
Similar to the TxD Time-out, a TxD to RxD short circuit would also block the bus communication. To avoid this, the
LIN transceiver has TxD to RxD short circuit detection. This failure is reported to the diagnostic frame of the SPI.
The transmitter is automatically inhibited and is reactivated after an SPI command.
10.5.4 Overtemperature
Figure 21 shows how the transmission stage is deactivated and activated again. The driver stages are protected
against overtemperature. Exceeding the shutdown temperature results in deactivation of the driving stages.
Nevertheless, the SBC can still receive messages via the RxD output, by setting automatically the LIN into LIN
Receive Only Mode. To avoid a bit failure after cooling down, the signals can be transmitted again only after a
dominant to recessive edge at TxD.
An overtemperature condition causes the transmission stage to deactivate. After the overtemperature condition is
no longer present, transmission is reactivated after the TxD bus signal has changed to recessive level. The failure
is not indicated in the SPI and doesn’t generate any interrupt.
Data Sheet
47
Rev. 1.0, 2009-03-31