NCV7381
FlexRay
)
Transceiver,
Clamp 30
NCV7381 is a single−channel FlexRay bus driver compliant with
the FlexRay Electrical Physical Layer Specification Rev. 3.0.1,
capable of communicating at speeds of up to 10 Mbit/s. It provides
differential transmit and receive capability between a wired FlexRay
communication medium on one side and a protocol controller and
a host on the other side.
NCV7381 mode control functionality is optimized for nodes
permanently connected to car battery.
It offers excellent EMC and ESD performance.
KEY FEATURES
General
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SSOP−16
DP SUFFIX
CASE 565AE
•
Compliant with FlexRay Electrical Physical Layer Specification
•
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Rev 3.0.1
FlexRay Transmitter and Receiver in Normal−power Modes for
Communication up to 10 Mbit/s
Support of 60 ns Bit Time
FlexRay Low−power Mode Receiver for Remote Wakeup Detection
Excellent Electromagnetic Susceptibility (EMS) Level over Full
Frequency Range. Very Low Electromagnetic Emissions (EME)
Bus Pins Protected against >10 kV System ESD Pulses
Safe Behavior under Missing Supply or No Supply Conditions
Interface Pins for a Protocol Controller and a Host
(TxD, RxD, TxEN, RxEN, STBN, BGE, EN, ERRN)
INH Output for Control of External Regulators
Local Wakeup Pin WAKE
TxEN Time−out
BGE Feedback
Supply Pins V
BAT
, V
CC
, V
IO
with Independent Voltage Ramp Up:
♦
V
BAT
Supply Parametrical Range from 5.5 V to 50 V
♦
V
CC
Supply Parametrical Range from 4.75 V to 5.25 V
♦
V
IO
Supply Parametrical Range from 2.3 V to 5.25 V
Compatible with 14 V and 28 V Systems
Operating Ambient Temperature
−40°C
to +125°C (T
AMB_Class1
)
Junction Temperature Monitoring with Two Levels
SSOP−16 Package
These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Bus Driver Voltage Regulator Control
Bus Driver – Bus Guardian Interface
Bus Driver Logic Level Adaptation
Bus Driver Remote Wakeup
MARKING DIAGRAM
16
NV7381−0
AWLYYWW
G
1
1
A
= Assembly Location
WL = Wafer Lot
YYWW = Year / Work Week
G
= Pb−Free Package
16
NV7381A0
AWLYYWW
G
PIN CONNECTIONS
INH
EN
V
IO
TxD
TxEN
RxD
BGE
STBN
1
V
CC
BP
BM
GND
WAKE
V
BAT
ERRN
RxEN
(Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 21 of this data sheet.
FlexRay Functional Classes
Quality
•
NCV Prefix for Automotive and Other
Applications Requiring Unique Site and
Control Change Requirements; AEC−Q100
Qualified and PPAP Capable
©
Semiconductor Components Industries, LLC, 2016
April, 2018
−
Rev. 4
1
Publication Order Number:
NCV7381/D
NCV7381
V
IO
V
CC
V
BAT
Voltage
Monitoring
TxD
TxEN
RxD
CC
Module
Thermal
Shutdown
INH
Transmitter
RxEN
BGE
STBN
ERRN
EN
Receiver
V
BAT
Wakeup
Detection
(Normal mode /
Low−power mode)
Host
Module
BGE
Module
Bus Error
Detection
BP
CONTROL
LOGIC
BM
WAKE
NCV7381
GND
Figure 1. Block Diagram
Table 1. PIN DESCRIPTION
Pin
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin
Name
INH
EN
V
IO
TxD
TxEN
RxD
BGE
STBN
RxEN
ERRN
V
BAT
WAKE
GND
BM
BP
V
CC
Pin Type
high−voltage analog output
digital input
supply
digital input
digital input
digital output
digital input
digital input
digital output
digital output
supply
high−voltage analog input
ground
high−voltage analog input/output
high−voltage analog input/output
supply
Pin Function
External regulator control output
Mode control input; internal pull−down resistor
Supply voltage for digital pins level adaptation
Data to be transmitted; internal pull−down resistor
Transmitter enable input; when High transmitter disabled; internal pull−up resistor
Receive data output
Bus guardian enable input; when Low transmitter disabled; internal pull−down
resistor
Mode control input; internal pull−down resistor
Bus activity detection output; when Low bus activity detected
Error diagnosis and status output
Battery supply voltage
Local wake up input; internal pull up or pull down
(depends on voltage at pin WAKE)
Ground connection
Bus line minus
Bus line plus
Bus driver core supply voltage; 5 V nominal
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2
NCV7381
APPLICATION INFORMATION
ECU
IN
VIO
reg.
OUT
C
VIO
INH
IN
VCC
reg.
OUT
C
VCC
C
VBAT
INH
VBAT
MCU
FlexRay
Communication
Controller
V
IO
TxD
TxEN
RxD
RxEN
BGE
STBN
V
CC
INH V
BAT
R
WAKE2
WAKE
R
WAKE1
WAKE
Bus Guardian
NCV7381
CMC
BP
BM
R
BUS1
R
BUS2
BP
BM
Host Interface
EN
ERRN
GND
C
BUS
GND
Figure 2. Application Diagram
Table 2. RECOMMENDED EXTERNAL COMPONENTS FOR THE APPLICATION DIAGRAM
Component
C
VBAT
C
VCC
C
VIO
R
WAKE1
R
WAKE2
R
BUS1
R
BUS2
C
BUS
CMC
Function
Decoupling capacitor on battery line, ceramic
Decoupling capacitor on V
CC
supply line, ceramic
Decoupling capacitor on V
IO
supply line, ceramic
Pull−up resistor on WAKE pin
Serial protection resistor on WAKE pin
Bus termination resistor (Note 1)
Bus termination resistor (Note 1)
Common−mode stabilizing capacitor, ceramic (Note 2)
Common−mode choke
Min
Typ
100
100
100
33
3.3
47.5
47.5
4.7
100
Max
Unit
nF
nF
nF
kW
kW
W
W
nF
mH
Functional operation above the stresses listed in the Recommended Operating Ranges is not implied. Extended exposure to stresses beyond
the Recommended Operating Ranges limits may affect device reliability.
1. Tolerance
±1%,
type 0805
2. Tolerance
±20%,
type 0805
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3
NCV7381
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
Normal Mode
STBN=H
EN=H
Transmitter: on
Receiver: on
INH: High
Power cons.: normal
STBN=H
EN=H
STBN=H
STBN=H
EN=H
STBN=L
EN=L
Standby Mode
Transmitter: off
Receiver: wakeup−detection
INH: High
Power cons.: low
EN=H
STBN=L
EN=L
STBN=L
EN=L
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.
Receive−only Mode
STBN=H
EN=L
STBN=H
EN=L
STBN=L
EN=H
STBN=L
EN=H
STBN=H
EN=L
STBN=L
EN=H
Go−to−sleep Mode
Transmitter: off
Receiver: wakeup−detection
INH: High
Power cons.: low
Transmitter: off
Receiver: on
INH: High
Power cons.: normal
STBN=H
EN=L
Power−up
STBN=L, EN=H
for >dGo−to−Sleep
Sleep Mode
Transmitter: off
Receiver: wakeup−detection
INH: floating
Power cons.: low
STBN=L, EN=H
for <dGo−to−Sleep
Figure 3. Operating Modes and their Control by the STBN and EN Pins
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NCV7381
Normal
Mode
STBN
Receive−Only
Mode
Standby
Mode
Go−to−sleep
Mode
Sleep
Mode
Normal
Mode
EN
ERRN
Error Flag
Error Flag
Wake Flag
Wake Flag
Error Flag
dGo−to−sleep
dBDModeChange
dBDModeChange dBDModeChange
dBDModeChange
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
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