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NCV7381DP0R2G

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
NCV7381
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4
FUNCTIONAL DESCRIPTION
Operating Modes
NCV7381 can switch between several operating modes
depicted in Figure 3. In Normal and Receive−only modes,
the chip interconnects a FlexRay communication controller
with the bus medium for full−speed communication. These
two modes are also referred to as normal−power modes.
In Standby and Sleep modes, the communication is
suspended and the power consumption is substantially
reduced. A wakeup on the bus or through a locally
monitored signal on pin WAKE can be detected and signaled
to the host. Go−to−sleep mode is a temporary mode ensuring
correct transition between any mode and the Sleep mode. All
three modes – Standby, Sleep and Go−to−sleep – are referred
to as low−power modes.
The operating mode selected is a function of the host
signals STBN and EN, the state of the supply voltages and
the wakeup detection. As long as all three supplies (V
BAT
,
V
CC
, V
IO
) remain above their respective under−voltage
detection levels, the logical control by EN and STBN pins
shown in Figure 3 applies. Influence of the power−supplies
and of the wakeup detection on the operating modes is
described in subsequent paragraphs.
Normal Mode
Transmitter: on
Receiver: on
INH: High
Power cons.: normal
Standby Mode
Receive−only Mode
Transmitter: off
Receiver: on
INH: High
Power cons.: normal
Go−to−sleep Mode
Transmitter: off
Receiver: wakeup−detection
INH: High
Power cons.: low
Sleep Mode
Transmitter: off
Receiver: wakeup−detection
INH: floating
Power cons.: low
STBN=H
EN=H
STBN=H
EN=L
STBN=L
EN=L
STBN=L
EN=H
STBN=L
EN=L
STBN=L
EN=H
STBN=H
EN=L
STBN=H
EN=H
STBN=L, EN=H
for <dGo−to−Sleep
STBN=L, EN=H
for >dGo−to−Sleep
Power−up
Figure 3. Operating Modes and their Control by the STBN and EN Pins
Transmitter: off
Receiver: wakeup−detection
INH: High
Power cons.: low
STBN=H
EN=H
STBN=H
EN=H
STBN=L
EN=L
STBN=H
EN=L
STBN=H
EN=L
STBN=L
EN=H
NCV7381
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5
Receive−Only
Mode
STBN
EN
ERRN
Error Flag Wake Flag
Normal
Mode
Error Flag
Standby
Mode
Go−to−sleep
Mode
Sleep
Mode
Normal
Mode
dBDModeChange dBDModeChange dBDModeChange dBDModeChange
dGo−to−sleep
Error Flag
Wake Flag
Figure 4. Timing Diagram of Operating Modes Control by the STBN and EN Pins
Power Supplies and Power Supply Monitoring
NCV7381 is supplied by three pins. V
BAT
is the main
supply both for NCV7381 and the full electronic module.
V
BAT
will be typically connected to the automobile battery
through a reverse−polarity protection. V
CC
is a 5 V
low−voltage supply primarily powering the FlexRay bus
driver core in a normal−power mode. V
IO
supply serves to
adapt the logical levels of NCV7381 to the host and/or the
FlexRay communication controller digital signal levels. All
supplies should be properly decoupled by filtering
capacitors − see Figure 2 and Table 2.
All three supplies are monitored by under−voltage
detectors with individual thresholds and filtering times both
for under−voltage detection and recovery – see Table 18.
Logic Level Adaptation
Level shift input V
IO
is used to apply a reference voltage
uV
DIG
= uV
IO
to all digital inputs and outputs in order to
adapt the logical levels of NCV7381 to the host and/or the
FlexRay communication controller digital signal levels
NCV7381
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6
Internal Flags
The NCV7381 control logic uses a number of internal flags (i.e. one−bit memories) reflecting important conditions or events.
Table 3 summarizes the individual flags and the conditions that lead to a set or reset of the flags.
Table 3. INTERNAL FLAGS
Flag Set Condition Reset Condition Comment
Local
Wakeup
Low level detected on WAKE pin in a low−
power mode
Low−power mode is entered
Remote
Wakeup
Remote wakeup detected on the bus in a
low−power mode
Low−power mode is entered
Wakeup Local Wakeup flag changes to set
or
Remote Wakeup flag changes to set
Normal mode is entered
or
Low−power mode is entered
or
Any under−voltage flag becomes set
Power−on Internal power supply of the chip becomes
sufficient for the operation of the control logic
Normal mode is entered
Thermal
Warning
Junction temperature is higher than Tjw
(typ. 140°C) in a normal−power mode
and
V
BAT
is not in under−voltage
(Junction temperature is below Tjw in
a normal−power mode
or
the status register is read in a low−power
mode)
and
V
BAT
is not in under−voltage
The thermal warning
flag has no influence
on the bus driver
function
Thermal
Shutdown
Junction temperature is higher than Tjsd
(typ. 165°C) in a normal−power mode
and
V
BAT
is not in under−voltage
Junction temperature is below Tjsd in
a normal−power mode
and
falling edge on TxEN
and
V
BAT
is not in under−voltage
The transmitter is
disabled as long as
the thermal shut-
down flag is set
TxEN
Timeout
TxEN is Low for longer than dBDTxAct-
iveMax (typ. 1.5 ms) and bus driver is in
Normal mode
TxEN is High or Normal mode is left The transmitter is
disabled as long as
the timeout flag is set
Bus Error Transmitter is enabled
and
Data on bus are different from TxD signal
(sampled after each TXD edge)
(Transmitter is enabled
and
Data on bus are identical to TxD signal)
or
Transmitter is disabled
The bus error flag
has no influence on
the bus driver func-
tion
V
BAT
Under−
voltage
V
BAT
is below the under−voltage threshold
for longer than dBDUVV
BAT
V
BAT
is above the under−voltage threshold
for longer than dBDRV
BAT
or
Wake flag becomes set
V
CC
Under−
voltage
V
CC
is below the under−voltage threshold for
longer than dBDUVV
CC
V
CC
is above the under−voltage threshold
for longer than dBDRV
CC
or
Wake flag becomes set
V
IO
Under−
voltage
V
IO
is below the under−voltage threshold for
longer than dUV
IO
V
IO
is above the under−voltage threshold for
longer than dBDRV
IO
or
Wake flag becomes set
Error Any of the following status bits is set:
• Bus error
• Thermal Warning
• Thermal Shutdown
• TxEN Timeout
• V
BAT
Under−voltage
• V
CC
Under−voltage
• V
IO
Under−voltage
All of the following status bits are reset:
• Bus error
• Thermal Warning
• Thermal Shutdown
• TxEN Timeout
• V
BAT
Under−voltage
• V
CC
Under−voltage
• V
IO
Under−voltage
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NCV7381DP0R2G

Mfr. #:
Buy NCV7381DP0R2G
Manufacturer:
ON Semiconductor
Description:
Interface - Specialized CLAMP 30 FLEXRAY TRANSC.
Lifecycle:
New from this manufacturer.
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