TLE6254-3G

Data Sheet

11

Rev. 2.1, 2007-08-09

When one of the bus failures 3, 5, 6, 6a and 7 is detected, the defective bus wire is

disabled by switching off the affected bus termination and the respective output stage. A

wake-up from sleep mode via the bus is possible either via a dominant CANH or CANL

line. This ensures that a wake-up is possible even if one of the failures 1 to 7 occurs.

A current limiting circuit protects the CAN transceiver output stages from damage by

short-circuit to positive and negative battery voltages.

The CANH and CANL pins are protected against electrical transients which may occur

in the severe conditions of automotive environments.

The transmitter output stages generate the majority of the power dissipation. Therefore

they are disabled if the junction temperature exceeds the maximum value. This

effectively reduces power dissipation, and hence will lead to a lower chip temperature,

while other parts of the IC can remain operating. In temperature shut-down condition the

TLE6254-3G is still able to receive CAN-bus messages.

Table 3

CAN Bus-line Failures

Failure #

Failure Description

1

CANL line interrupted

2

CANH line interrupted

3

CANL line shorted to

V

BAT

3a

CANL line shorted to

V

CC

4

CANH line shorted to GND

5

CANL line shorted to GND

6

CANH line shorted to

V

BAT

6a

CANH line shorted to V

CC

7

CANL line shorted to CANH line