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TJA1080ATS/2/T,118

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P49
TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 19 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
6.3.5 Star-sleep mode
This mode is entered if one of the following events occur:
• From any mode if an undervoltage on pin V
CC
is present for longer than t
det(uv)(VCC)
.
• If the transceiver is in Star-idle mode and no activity is detected on the bus lines and
pins TXEN, TRXD0 and TRXD1 for longer than t
to(idle-sleep)
.
• If Star-locked mode is active for longer than t
to(locked-sleep)
.
In Star-sleep mode the transceiver has entered a low power mode. In this mode the
current consumption is as low as possible to prevent the car battery from discharging. The
inhibit switches are switched off.
In this mode the wake flag wakes the transceiver. A detailed description of the wake-up
mechanism is given in Section 6.5
.
If pins V
IO
and V
BUF
are within their operating range, pins RXD and RXEN will indicate the
wake flag.
6.3.6 Star-locked mode
This mode is entered if one of the following events occur:
• If the transceiver is in Star-transmit mode and activity on pin TXEN is detected for
longer than t
to(tx-locked)
.
• If the transceiver is in Star-receive mode and activity is detected on the bus lines for
longer than t
to(rx-locked)
.
This mode is a fail-silent mode and in this mode the transmitter is disabled.
6.4 Start-up
The TJA1080A initialization is independent of the way the voltage supplies V
BAT
, V
CC
and
V
IO
ramp up. A dedicated power-up sequence is not necessary.
6.4.1 Node configuration
Node configuration can be selected by applying a voltage lower than 0.3V
BUF
to pins
TRXD0 and TRXD1 during power-on. Node configuration is latched by resetting the
PWON flag while the voltage on pins TRXD0 and TRXD1 is lower than 0.3V
BUF
; see
Section 6.7.4
for (re)setting the PWON flag.
6.4.2 Star configuration
Star configuration can be selected by applying a voltage higher than 0.7V
BUF
to pins
TRXD0 or TRXD1 during power-on. Star configuration is latched by resetting the PWON
flag while one of the voltages on pins TRXD0 or TRXD1 is higher than 0.7V
BUF
. See
Section 6.7.4
for (re)setting the PWON flag. In this case the transceiver goes from
Star-standby mode to Star-idle mode.
TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 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 V
IO
and V
BAT
, 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 t
det(wake)DATA_0
separated
by an idle or DATA_1 of at least t
det(wake)idle
, followed by an idle or DATA_1 of at least
t
det(wake)idle
are present on the bus lines within t
det(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 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.
Fig 8. Bus wake-up timing
001aae442
0 V
−425 mV
V
dif
t
det(wake)tot
t
det(wake)Data_0
t
det(wake)idle
t
det(wake)Data_0
t
det(wake)idle
TJA1080A All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.
Product data sheet Rev. 6 — 28 November 2012 21 of 49
NXP Semiconductors
TJA1080A
FlexRay transceiver
6.5.4 Local wake-up via pin WAKE
If the voltage on pin WAKE is lower than V
th(det)(WAKE)
for longer than t
wake(WAKE)
(falling
edge on pin WAKE) a local wake-up event on pin WAKE is detected. At the same time,
the biasing of this pin is switched to pull-down.
If the voltage on pin WAKE is higher than V
th(det)(WAKE)
for longer than t
wake(WAKE)
, the
biasing of this pin is switched to pull-up, and no local wake-up will be detected.
Each interruption is 130 ns.
The transition time from DATA_0 to DATA_1 and from DATA_1 to DATA_0 is about 20 ns.
The TJA1080A wake-up flag will be set with the following pattern:
FFh, FFh, FFh, FFh, FFh, 00h, 00h, 00h, 00h, 00h,
FFh, FFh, FFh, FFh, FFh, 00h, 00h, 00h, 00h, 00h,
FFh, FFh, FFh, FFh, FFh, 00h, 00h, 00h, 00h, 00h,
FFh, FFh, FFh, FFh, FFh, FFh
Fig 9. Minimum bus pattern for bus wake-up
015aaa043
V
dif
0 V
−1500
wake-up
+1500
870
ns
870
ns
870 ns 870 ns
770
ns
130 ns
130
ns
130
ns
5 μs
5 μs 5 μs 5 μs
Sleep mode: V
IO
and (V
BAT
or V
CC
) still provided.
Fig 10. Local wake-up timing via pin WAKE
001aae443
V
BAT
V
BAT
RXD and
RXEN
INH1 and
INH2
0 V
0 V
WAKE
t
wake(WAKE)
pull-up pull-up
t
wake(WAKE)
pull-down
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P33P34-P36P37-P39P40-P42P43-P45P46-P48P49-P49

TJA1080ATS/2/T,118

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Buy TJA1080ATS/2/T,118
Manufacturer:
NXP Semiconductors
Description:
Interface - Specialized FLEXRAY TRANSCEIVER
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