tja1080a NXP Semiconductors, tja1080a Datasheet - Page 20

• Manufacturer Part Number: tja1080a
• Description: Flexray Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1080A_3
Preliminary data sheet
6.5.3.1 Bus wake-up via wake-up pattern
6.5.3.2 Bus wake-up via dedicated FlexRay data frame
6.5.1 Node configuration
6.5.2 Star configuration
6.5.3 Remote wake-up
6.5 Wake-up mechanism
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 V
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.
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
Bus wake-up is detected if two consecutive DATA_0 of at least t
an idle or DATA_1 of at least t
t
The reception of a dedicated data frame, emulating a valid wake-up pattern, as shown in
Figure
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 s. 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.
det(wake)idle
Fig 8.
V
9, sets the wake-up flag of the TJA1080A.
dif
Bus wake-up timing
425 mV
are present on the bus lines within t
0 V
Figure
6).
Rev. 03 — 15 January 2009
t
det(wake)Data_0
det(wake)idle
IO
, followed by an idle or DATA_1 of at least
t
and V
det(wake)idle
det(wake)tot
BAT
t
det(wake)tot
, the transceiver switches immediately
t
det(wake)Data_0
.
det(wake)DATA_0
TJA1080A
FlexRay transceiver
t
det(wake)idle
© NXP B.V. 2009. All rights reserved.
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