TLE8262E datasheet(33/93 Pages) INFINEON

33 / 93 page

Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

High Speed CAN Transceiver

8.4

Failure Detection

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

TxD Time-out Feature

If the TxD signal is dominant for a time t >

TxD, the TxD time-out function deactivates the transmission of the signal

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.

Figure 12

TxD Time-out diagram

8.4.2

Bus Dominant Clamping

If the HS CAN bus signal in dominant for a time

t > t

BUS_TO, a bus dominant clamping is detected. The CAN

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

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

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.

cc2) via SPI command to prevent disturbances on the CAN bus. This failure is reported

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

Overtemperature

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 shows how the transmission stage is deactivated and activated again. First, an overtemperature

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.

TxDCAN

VCC1µC

Vdiff

TxD Time-out

Interrupt

GND

tTxD_TO

Txd timeout .vsd

SPI setting : CAN

Normal Mode

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