TJA1080ATSSLASH2SLASHT datasheet(20/49 Pages) NXP

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TJA1080A

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Product data sheet

Rev. 5 — 24 February 2011

20 of 49

NXP Semiconductors

TJA1080A

FlexRay transceiver

6.5 Wake-up mechanism

6.5.1 Node configuration

In Sleep mode (pins INH1 and INH2 are switched off), the transceiver will enter Standby

mode or Go-to-sleep mode (depending on the value at pin EN), if the wake flag is set.

Consequently, pins INH1 and INH2 are switched on.

If no undervoltage is present on pins VIO and VBAT, the transceiver switches immediately

to the mode indicated on pins EN and STBN.

In Standby, Go-to-sleep and Sleep modes pins RXD and RXEN are driven LOW if the

wake flag is set.

6.5.2 Star configuration

In Star-sleep mode (pins INH1 and INH2 are switched off), the transceiver will enter

Star-idle mode (pins INH1 and INH2 are switched on) if the wake flag is set. After entering

Star-idle mode the transceiver monitors for activity to choose the appropriate mode

transition (see Figure 6).

6.5.3 Remote wake-up

6.5.3.1

Bus wake-up via wake-up pattern

Bus wake-up is detected if two consecutive DATA_0 of at least tdet(wake)DATA_0 separated

by an idle or DATA_1 of at least tdet(wake)idle, followed by an idle or DATA_1 of at least

tdet(wake)idle are present on the bus lines within tdet(wake)tot.

6.5.3.2

Bus wake-up via dedicated FlexRay data frame

The reception of a dedicated data frame, emulating a valid wake-up pattern, as shown in

Figure 9, sets the wake-up flag of the TJA1080A.

Due to the Byte Start Sequence (BSS), preceding each byte, the DATA_0 and DATA_1

phases for the wake-up symbol are interrupted every 1

μs. For 10 Mbit/s the maximum

interruption time is 130 ns. Such interruptions do not prevent the transceiver from

recognizing the wake-up pattern in the payload of a data frame.

The wake-up flag will not be set upon reception of an invalid wake-up pattern.

Fig 8.

Bus wake-up timing

001aae442

0 V

−425 mV

Vdif

tdet(wake)tot

tdet(wake)Data_0

tdet(wake)idle

tdet(wake)Data_0

tdet(wake)idle

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