NCV7381(2012) Просмотр технического описания (PDF) - ON Semiconductor
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NCV7381 Datasheet PDF : 23 Pages
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NCV7381
Operating Mode Changes Caused by Internal Flags
Changes of some internal flags described in Table 3 can
force an operating mode transition complementing or
overruling the operating mode control by the digital inputs
STBN and EN which is shown in Figure 3:
• Setting the VBAT or VIO under−voltage flag causes a
transition to the Sleep mode
• Setting the VCC under−voltage flag, while the bus driver
is not in Sleep, causes a transition to the Standby mode
• Reset of the Under−voltage flag (i.e. recovery from
under−voltage) re−enables the control of the chip by
digital inputs STBN and EN.
• Setting of the Wake flag causes the reset of all
under−voltage flags and the NCV7381 transitions to the
Standby mode. The reset of the under−voltage flags
allows the external power supplies to stabilize properly
if, for example, they were previously switched off
during Sleep mode.
uBus
FlexRay Bus Driver
NCV7381 contains a fully−featured FlexRay bus driver
compliant with Electrical Physical Layer Specification Rev.
3.0.1. The transmitter part translates logical signals on
digital inputs TxEN, BGE and TxD into appropriate bus
levels on pins BP and BM. A transmission cannot be started
with Data_1. In case the transmitter is enabled for longer
than dBDTxActiveMax, the TxEN Timeout flag is set and the
current transmission is disabled. The receiver part monitors
bus pins BP and BM and signals the detected levels on digital
outputs RxD and RxEN. The different bus levels are defined
in Figure 5. The function of the bus driver and the related
digital pins in different operating modes is detailed in
Table 4 and Table 5.
• The transmitter can only be enabled if the activation of
the transmitter is initiated in Normal mode.
• The receiver function is enabled by entering a
normal−power mode.
BP
VCC/2
Idle_LP
Idle
Data_0
Figure 5. FlexRay Bus Signals
BM
Data_1
Table 4. TRANSMITTER FUNCTION AND TRANSMITTER−RELATED PINS
Operating Mode
BGE
TxEN
Standby, Go−to−sleep, Sleep
x
x
Receive−only
x
x
Normal
0
x
1
1
1
0
1
0
TxD
Transmitted Bus Signal
x
Idle_LP
x
Idle
x
Idle
x
Idle
0
Data_0
1
Data_1
Table 5. RECEIVER FUNCTION AND RECEIVER−RELATED PINS
Operating Mode
Signal on Bus
Standby, Go−to−sleep, Sleep
x
x
Normal,
Receive−only
Idle
Data_0
Data_1
Wake flag
not set
set
x
x
x
RxD
High
Low
High
Low
High
RxEN
High
Low
High
Low
Low
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