TLE6251-3G Datasheet, PDF (12/36 Pages) Infineon Technologies AG – High Speed CAN-Transceiver with Wake and Failure Detection

TLE6251-3G
Operation Modes
5.4
Go-To-Sleep Command
The Go-To-Sleep command is a transition mode allowing external circuitry like a microcontroller to prepare the
ECU for the Sleep mode. The TLE6251-3G stays in the Go-To-Sleep command for the maximum time t = t_hSLP,
after exceeding the time t_hSLP the device changes into Sleep mode. A mode change into Sleep mode is only
possible via the Go-To-Sleep command. During the Go-To-Sleep command the following functions on the
TLE6251-3G are available:
• The output driver stage is disabled.
• The normal receiver unit is disabled.
• The low power receiver is active and monitors the CAN bus. In case of a message on the CAN bus the
TLE6251-3G sets an internal Wake-Up flag.
• The local Wake-Up pin is active and can detect a local Wake-Up event.
• The INH output is active and set to V_S.
• Through the internal resistors R_I (see Figure 1), the pins CANH and CANL are connected to GND.
• The TxD pin is disabled.
• The failure diagnostic is disabled.
• The under-voltage detection on all 3 power supplies V_CC, V_IO and V_S is active.
Setting the NSTB pin to logical “Low”, while the EN signal remains at logical “High”, activates the Go-To-Sleep
command. The Go-To-Sleep command can be entered from Normal Operation mode, Receive-Only mode and
from Stand-By mode.
5.5
Sleep Mode
The Sleep mode is a power save mode. In Sleep mode the current consumption of the TLE6251-3G is reduced to
a minimum while the device is still able to Wake-Up by a message on the CAN bus or a local Wake-Up event on
the pin WK. Most of the functions of the TLE6251-3G are disabled:
• The output driver stage is disabled.
• The normal receiver unit is disabled.
• The low power receiver is active and monitors the CAN bus. In case of a message on the CAN bus the
TLE6251-3G changes from Sleep mode to Stand-By mode and sets an internal Wake-Up flag.
• The local Wake-Up pin is active and in case of a signal change on the WK pin the operation mode changes to
Stand-By mode.
• The INH output is floating.
• Through the internal resistors R_I (see Figure 1), the pins CANH and CANL are connected to GND.
• If the power supplies V_CC and V_IO are present, the RxD pin indicates the Wake-Up event.
• The TxD pin is disabled
• The under-voltage detection on the power supply V_S is active and sends the device into Stand-By mode in case
of an under-voltage event.
There are only two ways to enter Sleep mode:
• The device can activate the Sleep mode via the mode control pins EN and NSTB.
• An under-voltage event on the power supplies V_CC and V_IO changes the operation mode to Sleep mode.
Data Sheet
12
Rev. 1.1, 2011-06-06