TLE6251G_08 Datasheet, PDF (15/32 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake Detection

TLE 6251 G
Local Failure-Flags and -Detection
TxD Dominant Failure Detection
• Effect: permanent dominant signal for t > t_TxD at TxD
• Indicator: NERR = LOW in RxOnly mode (local failure flag is set)
• Action: disabling of the transmitter stage
• Remarks: release of the transmitter stage only after transition into RxOnly mode (failure
diagnosis) and transition into normal mode.
RxD Permanent Recessive Clamping
• Effect: internal RxD signal does not match signal at RxD pin because the RxD pin is pulled
to HIGH (permanent HIGH)
• Indicator: NERR = LOW in RxOnly mode (local failure flag is set)
• Action: disabling of the receiver stage
• Remarks: the flag is cleared by changing from RxOnly (failure diagnosis) into normal mode
or RxD gets dominant.
TxD to RxD Short Circuit
• Effect: short circuit between RxD and TxD
• Indicator: NERR = LOW in RxOnly mode (local failure flag is set)
• Action: disabling of the transmitter stage
• Remarks: the flag is cleared by changing from RxOnly (failure diagnosis) into normal mode.
Bus Dominant Clamping
• Effect: permanent dominant signal at the CAN bus for t > t_BUS
• Indicator: NERR = LOW in RxOnly mode (local failure flag is set)
• Action: none
• Remarks: none
Overtemperature Detection
• Effect: junction temperature at the driving stages exceeded
• Indicator: NERR = LOW in RxOnly mode (local failure flag is set)
• Action: disabling of the transmitter stage
• Remarks: the flag is cleared by changing from RxOnly (failure diagnosis) into normal mode
or RxD gets dominant. Bus only released after the next dominant bit in TxD.
Final Data Sheet
15
Rev. 3.3, 2008-06-19