TLE8262E datasheet(47/93 Pages) INFINEON

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Data Sheet

Rev. 1.0, 2009-03-31

TLE8262E

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 >

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.

Figure 20

TxD Time-out Diagram

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.

TxDLIN

VCC1µC

VBUS

TxD Time-out

Interrupt

GND

tTxD_TO

LIN Txd timeout .vsd

SPI setting : LIN

Normal Mode

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