tja1081 NXP Semiconductors, tja1081 Datasheet - Page 13

• Manufacturer Part Number: tja1081
• Description: Flexray Node Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1081_1
Preliminary data sheet
6.3.1.1 Bus wake-up via wake-up pattern
6.3.1.2 Bus wake-up via dedicated FlexRay data frame
6.3.1 Remote wake-up
6.3 Wake-up mechanism
The undervoltage flags will be reset when the wake flag is set, and the transceiver will
enter the mode indicated by the levels on pins EN and STBN if V
From Sleep mode (pin INH is switched off), the transceiver will enter Standby or
Go-to-sleep mode (depending on the level at pin EN) if the wake flag is set. Consequently,
pin INH is switched on.
If an undervoltage is not detected on pins V
immediately to the mode indicated by the levels 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.
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 if an invalid wake-up pattern is received.
det(wake)idle
Fig 6.
V
7, sets the wake-up flag of the TJA1081.
dif
Bus wake-up timing
425 mV
are present on the bus lines within t
0 V
Rev. 01 — 15 April 2009
t
det(wake)Data_0
det(wake)idle
, followed by an idle or DATA_1 of at least
t
det(wake)idle
IO
, V
det(wake)tot
CC
t
det(wake)tot
and V
t
det(wake)Data_0
.
BAT
, the transceiver will switch
FlexRay node transceiver
det(wake)DATA_0
IO
is present.
t
det(wake)idle
© NXP B.V. 2009. All rights reserved.
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