TLE6266G Datasheet, PDF (12/50 Pages) Infineon Technologies AG – System Basis Chip

Target Datasheet TLE 6266
Table 4 CAN bus line failure cases (according to ISO 11519-2)
Failure
#
Failure Description
1
CANL line interrupted
2
CANH line interrupted
3
CANL shorted to V_bat, CANL > 7.2 V
3a (no ISO failure) CANL shorted to V_cc; 3.2 V < CANL < 7.2 V
4
CANH shorted to GND
5
CANL shorted to GND
6
CANH shorted to V_bat; CANH > 7.2 V
6a (no ISO failure) CANH shorted to V_cc; 1.8 V < CANH < 7.2 V
7
CANL shorted to CANH
In case the transmission data input TxD is permanently dominant, both, the CANH and
CANL transmitting stage are disabled after a certain delay time t_TxD. This is necessary
to prevent the bus from being blocked by a defective protocol unit or short to GND at the
TxD input.
In order to protect the transceiver output stages from being damaged by shorts on the
bus lines, current limiting circuits are integrated. The CANL and CANH output stage
respectively are protected by an additional temperature sensor, that disables them as
soon as the junction temperature exceeds the maximum value. In the temperature shut-
down condition of the CAN output stages receiving messages from the bus lines is still
possible. A thermal shutdown of the CAN-transceiver circuit is monitored via the SPI
output bit 15. The CANH and CANL pins are also protected against electrical transients
which may occur in the severe conditions of automotive environments.
Table 5 SPI output bits for bus failure diagnosis
OBIT
13
12
11
10
9
8
0
Bus Failure
CAN Failure 2 and 4
CAN Failure 1 and 3a
CAN Failure 6
CAN Failure 6a
CAN Failure 5 and 7
CAN Failure 3
CAN Bus Failure
Version 1.06
13
2002-11-26