TLE9221SX Datasheet, PDF (46/91 Pages) Infineon Technologies AG – FlexRay Transceiver

TLE9221SX
Operating Mode Description
1) The table describes the states and signals of flags, operating modes and output pins. This table does not contain any timing information. Time for mode changes or the response time of
the digital outputs are specified in the electrical characteristics (compare with Table 21).
2) All flags are “low” active. “L” means the flag is set.
“X” = “don’t care”.
The color red stands for the event which triggered the mode transition.
For example: set “L” or set “H”.
The color blue stands for the consequence of the trigger event.
The numbers, “1 =>”, “2 =>” indicate the order of the consequences.
For example: “1=> BD_Normal” means the transceiver TLE9221SX changes over to BD_Normal mode.
“2=> H” means the flag is cleared after the TLE9221SX has changed over to BD_Normal mode.
“FB” stands for “Follow Bus” and means that depending on the signal on the FlexRay bus, the pins RxD and RxEN can either be “high” or “low”.
3) The wake-up flag stands for a detected wake-up event (compare with Chapter 7.3 and Table 10).
The uV_BAT flag is the same as the uV_BAT undervoltage flag, which is set after the uV_BAT undervoltage detection timer expires (compare with Chapter 8.3.1).
The uV_IO flag is the same as the uV_IO undervoltage flag, which is set after the uV_IO undervoltage detection timer expires (compare with Chapter 8.3.1).
The uV_CC flag is the same as the uV_CC undervoltage flag, which is set after the uV_CC undervoltage detection timer expires (compare with Chapter 8.3.1).
4) The ERRN output indicates the wake-up flag, the wake-up source bit and the error bit (compare with Table 9). The error bit is set only by the undervoltage bits, such as the uV_BAT
undervoltage bit (bit 8), the uV_CC undervoltage bit (bit 9) and the uV_IO undervoltage bit (bit 10). All other possible sources setting the error bit, such as, for example a bus failure or an
overtemperature event, are considered as not set in this table.
5) The signal at the ERRN output pin depends on the host command applied and not on the current operating mode (compare with Chapter 6.3).
6) The signals at the RxD and RxEN outputs depend on the current operation mode, and are independent of the host command applied (compare with Table 5).
7) While TLE9221SX changes over to BD_Normal mode, the wake-up flag is cleared. Moreover, the wake-up flag cannot be set in non-low power mode, and therefore the wake-up flag is
always “high” in BD_Normal mode (see Chapter 7.3).
8) The wake-up flag was set during a previous wake-up event while the TLE9221SX was in low power mode.
9) The interim mode will automatically be left to BD_Sleep when the timer dBD_Sleep expires. If the host command does not change within the time dBD_Sleep, the TLE9221SX changes over by
default to BD_Sleep mode (see Chapter 9.2.1).
10) The BD_GoToSleep command cannot be executed while the wake-up flag is active (see Figure 34). The TLE9221SX changes over directly to BD_StandBy mode.
11) Since the BD_GoToSleep command can be executed only when the wake-up flag is cleared, the wake-up flag is always “high” while the TLE9221SX executes the BD_GoToSleep
command.
12) If the host command BD_ReceiveOnly mode is applied, the ERRN output indicates the wake-up source bit (see Table 9).
13) The EN input pin of the Host Interface is disabled in BD_Sleep mode, as long the STBN input pin remains “low” (see Chapter 9.2.2).
14) A wake-up event would change the operation mode from BD_Sleep to BD_Standby, therefore, the wake-up flag is always “high” while the TLE9221SX remains in BD_Sleep mode.
Data Sheet
46
Rev. 1.10, 2013-07-15