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TLE9221SX Datasheet, PDF (51/91 Pages) Infineon Technologies AG – FlexRay Transceiver | |||
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TLE9221SX
Operating Mode Description
2) All flags are âlowâ active. âLâ means the flag is set.
âXâ = âdonât careâ.
The color red stands for the event which triggered the mode transition.
For example: set âLâ or set âHâ.
The color blue stands for the consequence of the trigger event.
The numbers, â1 =>â, â2 =>â indicate the order of the consequences.
For example: â1=> BD_Normalâ means the transceiver TLE9221SX changes over to BD_Normal mode.
â2=> Hâ means the flag is cleared after the TLE9221SX has changed over to BD_Normal mode.
âFBâ stands for âFollow Busâ and means that depending on the signal on the FlexRay bus, the pins RxD and RxEN can either be âhighâ or âlowâ.
3) The wake-up flag stands for a detected wake-up event (compare with Chapter 7.3 and Table 10).
The uVBAT flag is the same as the uVBAT undervoltage flag, which is set after the uVBAT undervoltage detection timer expires (compare with Chapter 8.3.1).
The uVIO flag is the same as the uVIO undervoltage flag, which is set after the uVIO undervoltage detection timer expires (compare with Chapter 8.3.1).
The uVCC flag is the same as the uVCC undervoltage flag, which is set after the uVCC 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 uVBAT
undervoltage bit (bit 8), the uVCC undervoltage bit (bit 9) and the uVIO 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 âhighâ in BD_Normal mode (see Chapter 7.3).
8) The uVBAT undervoltage flag overrules the uVCC undervoltage flag (see Chapter 9.3.1).
9) An undervoltage event at uVIO blocks the Host Interface at once and sets all outputs to logical âlowâ (see Chapter 8.3.4 and Figure 28). The transceiver TLE9221SX can not indicate the
error bit and the wake-up flag.
10) The uVIO undervoltage flag overrules the uVCC undervoltage flag (see Chapter 9.3.1).
11) The wake-up flag was set during a previous wake-up event while the TLE9221SX was in low power mode.
12) If the host command BD_ReceiveOnly mode is applied, the ERRN indicates the wake-up source bit (see Table 9).
13) Since the BD_GoToSleep command can be executed only when the wake-up flag is cleared, the wake-up flag is always âhighâ while the TLE9221SX executes the BD_GoToSleep
command.
14) The BD_GoToSleep command is considered as low power mode and the ERRN indicates the wake-up flag just as in the BD_Sleep or BD_Standby mode (see Table 9).
Data Sheet
51
Rev. 1.10, 2013-07-15
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