TLE9221SX Datasheet, PDF (48/91 Pages) Infineon Technologies AG – FlexRay Transceiver

STBN
t = dBDLogic_Filter
TLE9221SX
Operating Mode Description
t = dBD_Modechange
EN
BD_ReceiveOnly mode
host command detection
INH
mode transition
t
don’t care
t
BD_Standby mode
t
RxD
RxEN
follow Bus
t
Figure 34 Changing over to BD_Standby, with an active wake-up flag
9.2.2 Quitting BD_Sleep by Host Command
Changeover to BD_Sleep mode can be made by a host command or by an undervoltage event. In case
changeover to BD_Sleep was made by a host command via the BD_GoToSleep command, the EN input pin gets
disabled when the TLE9221SX changes over to BD_Sleep mode.
As long as the STBN input pin remains at logical “low”, any signal change at the EN input is ignored and does not
trigger any mode change. Signal change at the STBN input pin enables the EN input as well and a mode change
is possible.
Via a host command, BD_Sleep mode can only change to BD_Normal mode or to BD_ReceiveOnly mode (see
Figure 32 and Table 13).
9.3
Operating Mode Changeover by Undervoltage Flag
Besides a valid host command, any changeovers in the operating mode may also be triggered by setting the
undervoltage flag after the undervoltage detection timer has expired (compare with Chapter 8.3.1). Setting the
uV_IO or the uV_BAT undervoltage flag changes the mode of operation to BD_Sleep, and setting the uV_CC
undervoltage flag changes the mode of operation to BD_Standby.
If the transceiver TLE9221SX changes over to BD_Sleep mode by setting the uV_IO or uV_BAT undervoltage flag, the
EN input pin remains active even in BD_Sleep mode.
In case any undervoltage flag becomes active, while the FlexRay transceiver TLE9221SX is executing the
BD_GoToSleep command, the mode of operation changes directly to BD_Sleep (see Table 14 and Figure 35).
Data Sheet
48
Rev. 1.10, 2013-07-15