tle8261-2e Infineon Technologies Corporation, tle8261-2e Datasheet - Page 33

• Manufacturer Part Number: tle8261-2e
• Description: Universal System Basis Chip Hermes
• Manufacturer: Infineon Technologies Corporation

8.4
All failures are reported in the SPI diagnostic encoder, the TxD time-out is reported as TxD shorted to GND. In
case of local failure and Bus Dominat Clamped failure, the transceiver is automatically switched to the CAN
Receive only Mode.
8.4.1
If the TxD signal is dominant for a time t >
at the bus. This is implemented to prevent the bus from being blocked permanently due to an error. The
transmission is released after switching the CAN to Active Mode via SPI. Refer to
Figure 12
8.4.2
If the HS CAN bus signal in dominant for a time
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.
8.4.3
Similar to the TxD time-out, a TxD to RxD short circuit would also block the bus communication. To avoid this, the
CAN transceiver provides TxD to RxD short circuit detection. In this case, it is recommended to switch OFF the
SBC HS CAN supply (e.g.
into the diagnostic frame of the SPI. The INT pin is set LOW if not disabled via SPI. The transmitter is automatically
inhibited and goes back to normal operation after a SPI command.
8.4.4
The driver stages are protected against overtemperature. Exceeding the shutdown temperature results in
deactivation of the CAN transceiver. The CAN transceiver is activated gain after cooling down, the device stays in
CAN Active Mode. To avoid a bit failure after cooling down, the signals can be transmitted again only after a
dominant to recessive edge at TxD.
Figure 13
condition causes the CAN transceiver to be deactivated. After the overtemperature condition is no longer present,
the transmission is released automatically after the TxD bus signal has changed to recessive level.
Data Sheet
V
GND
C C1µC
shows how the transmission stage is deactivated and activated again. First, an overtemperature
TxD
Failure Detection
TxD Time-out Feature
TxD Time-out diagram
Bus Dominant Clamping
TxD to RxD Short Circuit Feature
Overtemperature
V
diff
CAN
V
cc2
) via SPI command to prevent disturbances on the CAN bus. This failure is reported
t
TxD_TO
t
TxD
, the TxD time-out function deactivates the transmission of the signal
t
>
TxD Time -out
t
33
BUS_TO
Interrupt
, a bus dominant clamping is detected. The CAN
High Speed CAN Transceiver
Figure
SPI setting : CAN
Normal Mode
12.
Rev. 1.0, 2009-05-26
Txd timeout .vsd
TLE8261-2E
t
t