TLE9221SX Datasheet, PDF (47/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Operating Mode Description
9.2.1 Entering BD_Sleep Mode via the BD_GoToSleep Command
The BD_GoToSleep command can be executed from every non-low power mode and from BD_Standby mode by
applying the host command STBN = “L” and EN = “H”. The BD_GoToSleep command cannot be executed from
BD_Sleep mode (see Figure 32).
When the transceiver TLE9221SX recognizes the host command BD_GoToSleep, the TLE9221SX changes over
to the interim mode “BD_GoToSleep command” and starts an internal timer. In case the EN input and the STBN
input remain unchanged during the BD_Sleep mode detection window (t = dBD_Sleep), the operating mode
automatically changes over to BD_Sleep mode. The time for the mode change, dBD_ModeChange, is defined as the
time interval between applying the host command and changing over to BD_Sleep mode (see Figure 33).
STBN
t = dBDLogic_Filter
t = dBD_Sleep
t = dBD_ModeChange
EN
BD_Normal mode
host command detection
INH
BD_GoToSleep command
t
don’t care
t
BD_Sleep mode
t
RxD
RxEN
follow Bus
t
ERRN
t
All wake-up bits and the error bit are cleared, therefore the ERRN, RxD and RxEN outputs are “high”
Figure 33 Entering BD_Sleep mode
The BD_GoToSleep command can be executed only when the wake-up flag is cleared. When the wake-up flag is
cleared, the output pins RxD and RxEN are set to logical “high” in BD_Sleep mode and also during the execution
of the “BD_GoToSleep command”.
In case the changeover to BD_Sleep mode is made by a host command, the EN input is disabled in BD_Sleep
mode (see Figure 32, Figure 33 and Table 13).
Applying the BD_GoToSleep host command to the TLE9221SX, while the wake-up flag is active, changes the
operating mode directly to BD_Standby mode. The RxD and RxEN outputs are set to “low” and indicate a previous
wake-up event (see Figure 34 and Table 13).
Data Sheet
47
Rev. 1.10, 2013-07-15