tja1080 NXP Semiconductors, tja1080 Datasheet - Page 21

• Manufacturer Part Number: tja1080
• Description: Flexray Transceiver
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TJA1080_2
Product data sheet
7.5.4 Local wake-up via pin WAKE
7.6 Fail silent behavior
If the voltage on pin WAKE is lower than V
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
biasing of this pin is switched to pull-up, and no local wake-up will be detected.
In order to be fail silent, undervoltage detection and a reset mechanism for the digital state
machine is implemented.
If an undervoltage is detected on pins V
low power mode. This ensures a passive and defined behavior of the transmitter and
receiver in case of an undervoltage detection.
In the region between the minimum operating voltage and the undervoltage detection
threshold, the principle function of the transmitter and receiver is maintained. However, in
this region parameters (e.g. thresholds and delays of the transmitter and receiver) may
deviate from the range specified for the operating range.
The digital state machine is supplied out of V
is available. Therefore, the digital state machine remains properly supplied as long as one
supply voltage (V
If the voltage on all pins V
digital state machine as soon as the internal supply voltage for the digital state machine is
not sufficient for proper operation of the state machine. This ensures a passive and
defined behavior of the digital state machine in case of an overall supply voltage
breakdown.
Fig 8. Local wake-up timing via pin WAKE
Sleep mode: V
INH1 and
RXD and
CC
WAKE
RXEN
INH2
, V
IO
and (V
IO
Rev. 02 — 12 July 2007
or V
V
V
CC
BAT
BAT
0 V
0 V
BAT
, V
BAT
or V
IO
) is available.
and V
CC
) still provided.
t
wake(WAKE)
BAT
CC
pull-up
th(det)(WAKE)
, V
breaks down, a reset signal will be given to the
th(det)(WAKE)
CC
IO
, V
and/or V
IO
or V
for longer than t
for longer than t
pull-down
BAT
BAT
t
wake(WAKE)
, the transceiver will enter a
, dependent on which voltage
001aae443
pull-up
FlexRay transceiver
wake(WAKE)
wake(WAKE)
© NXP B.V. 2007. All rights reserved.
TJA1080
(falling
, the
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