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TLE6263G Datasheet(PDF) 11 Page - Infineon Technologies AG |
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TLE6263G Datasheet(HTML) 11 Page - Infineon Technologies AG |
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11 / 40 page  Final Datasheet TLE 6263 Version 2.08 11 2004-06-07 Electromagnetic Emmision (EME) To reduce radiated electromagnetic emission (EME), the dynamic slopes of the CANL and CANH signals are both limited and symmetric. This allows the use of an unshielded twisted or parallel pair of wires for the bus. During single-wire transmission (one of the bus lines is affected by a bus line failure) the EME performance of the system is degraded from the differential mode. 6.4 Bus Failure Management There are 9 different CAN bus wiring failures defined by the ISO 11519-2/ISO 11898-3 standard. These failures are devided into 7 failure groups (see Table 2). The difference between ISO11898-3 and ISO 11519-2 is also shown in Table 2. When a bus wiring failure is detected the device automatically switches to a dedicated CANH or CANL single-wire mode to maintain the communication if necessary. Therefore it is equipped with one differential receiver and four single ended comparators (two for each bus line). To avoid false triggering by external RF influences, the single wire modes are activated after a certain delay time. As soon as the bus failure disappears the transceiver switches back to differential mode after another time delay. The differential receiver threshold is set to typ. -2.5V. This ensures correct reception in the normal operation mode as well as in the failure cases 1, 2, 3a(6a) and 4(5) with a noise margin as high as possible. When one of the bus failures 3(6), 5(4), 6(3), 6a(3a), and 7 is detected, the defective bus wire is disabled by switching off the affected bus termination and output stage. The failure cases in brackets() are the failure cases according to ISO 11898-3. Simultaneously the multiplexing output of the receiver circuit is switched to the unaffected single ended comparator The bus failures are monitored via the diagnosis protocoll of the SPI. A general indication of a CAN failure during normal mode at CANH or CANL is reported by OBIT 4 and 5. It is also possible to distinguish 6 CAN bus failures or failure groups on the SPI output bits 3 to 7 in the RxOnly mode(see Table 2 and 5). The failures are reported until transmission of the next CAN word begins. In case the transmission data input TxD is permanently dominant, both, the CANH and CANL transmitting stage are disabled after a certain delay time tTxD. 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. |
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