TLE6251DS Datasheet, PDF (7/22 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Bus wake-up

TLE6251DS
Transmission
The signal from the µC is applied to the TxD input of the TLE6251DS. Now the bus driver
switches the CANH/L output stages to transfer this input signal to the CAN bus lines.
TxD Time-out Feature
If the TxD signal is dominant for a time t > t_TxD the TxD time-out function deactivates the
transmission of the signal at the bus. This is realized to prevent the bus from being blocked
permanently dominant due to an error.
The transmission is released again, after a rising edge at TxD has been detected.
Reduced Electromagnetic Emission
The bus driver has an implemented control to reduce the electromagnetic emission (EME). This
is achieved by controlling the symmetry of the slope, resp. of CANH and CANL.
Overtemperature
The driver stages are protected against overtemperature. Exceeding the shutdown temperature
results in deactivation of the driving stages at CANH/L. To avoid a bit failure after cooling down,
the signals can be transmitted again only after a dominant to recessive edge at TxD.
Figure 4 shows the way how the transmission stage is deactivated and activated again. First an
over temperature condition causes the transmission stage to deactivate. After the over
temperature condition is no longer present, the transmission is only possible after the TxD signal
has changed to recessive level.
Data Sheet
7
Rev. 3.1, 2007-08-20