TLE6251G_08 Datasheet, PDF (8/32 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake Detection

TLE 6251 G
Application Information
As a successor to the first generation of HS CAN, the TLE 6251 G is designed to provide an
excellent passive behavior when the transceiver is switched off (mixed networks, terminal 15/30
applications). The current consumption can be reduced, due to the low power modes. This
supports networks with partially powered down nodes.
A wake-up from the low power modes is possible via a message on the bus or via the bi-level
sensitive wake input WK. An external voltage supply IC can be controlled by the inhibit output
INH. So, the µC can be powered down and the TLE 6251 G still reacts to wake-up activities on
the CAN bus or local wake input activities.
A diagnosis output pin NERR, allows mode dependent enhanced diagnosis of bus failures and
wake-up source. A V_BAT fail flag reports a power-on condition at the battery supply input. The
V_BAT fail flag will be resetted after the first transition into normal mode.
The TLE 6251 G has four operation modes, the normal, the receive only, the standby mode and
the sleep mode. These modes can be controlled with the two control pins EN and NSTB pin (see
Figure 6, Table 2). Both, EN and NSTB, have an implemented pull-down, so if there is no signal
applied to EN and NSTB, the transceiver automatically changes to the standby mode.
Normal Mode
To transfer the TLE 6251 G into the normal mode, NSTB and EN have to be switched to HIGH
level. This mode is designed for the normal data transmission/reception within the HS-CAN
network.
Transmission
The signal from the µC is applied to the TxD input of the TLE 6251 G. 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 due to an error.
The transmission is released again, after a mode state change.
TxD to RxD Short Circuit Feature
Similar to the TxD time-out, a TxD to RxD short circuit would also drive a permanent dominant
signal at the bus and so block the communication. To avoid this, the TLE 6251 G has a TxD to
RxD short circuit detection.
Final Data Sheet
8
Rev. 3.3, 2008-06-19