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PDF NCV7321 Data sheet ( Hoja de datos )
| Número de pieza | NCV7321 | |
| Descripción | Stand Alone LIN Transceiver | |
| Fabricantes | ON Semiconductor | |
| Logotipo |  |
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NCV7321
Stand-alone LIN Transceiver
Description
The NCV7321 is a fully featured local interconnect network (LIN)
transceiver designed to interface between a LIN protocol controller
and the physical bus. The transceiver is implemented in I3T
technology enabling both high−voltage analog circuitry and digital
functionality to co−exist on the same chip.
The NCV7321 LIN device is a member of the in−vehicle
networking (IVN) transceiver family.
The LIN bus is designed to communicate low rate data from control
devices such as door locks, mirrors, car seats, and sunroofs at the
lowest possible cost. The bus is designed to eliminate as much wiring
as possible and is implemented using a single wire in each node. Each
node has a slave MCU−state machine that recognizes and translates
the instructions specific to that function. The main attraction of the
LIN bus is that all the functions are not time critical and usually relate
to passenger comfort.
Features
• LIN−Bus Transceiver
♦ LIN Compliant to Specification Revision 2.x (Backwards
Compatible to Version 1.3) and J2602
♦ Bus Voltage $45 V
♦ Transmission Rate 1 kbps to 20 kbps
♦ Supports K−Line Bus Architecture
• Protection
♦ Thermal Shutdown
♦ Indefinite Short−Circuit Protection on Pins LIN and WAKE
Towards Supply and Ground
♦ Load Dump Protection (45 V)
♦ Bus Pins Protected Against Transients in an Automotive
Environment
• EMI Compatibility
♦ Integrated Slope Control
• Modes
♦ Normal Mode: LIN Transceiver Enabled, Communication via the
LIN Bus is Possible, INH Switch is On
♦ Sleep Mode: LIN Transceiver Disabled, the Consumption from
VBB is Minimized, INH Switch is Off
♦ Standby Mode: Transition Mode reached either after Power−up or
after a Wake−up Event, INH Switch is on
♦ Wake−up Bringing the Component from Sleep Mode into Standby
Mode is Possible either by LIN Command or a Digital Signal on
WAKE Pin (e.g. External Switch)
Quality
• NCV Prefix for Automotive and Other Applications Requiring
Unique Site and Control Change Require− ments; AEC−Q100
Qualified and PPAP Capable
• These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
www.onsemi.com
8
1
SOIC−8
CASE 751
MARKING
DIAGRAMS
8
NV7321−x
FALYW
G
1
DFN8
1 NV73
CASE 506DG
21−y
1 ALYWG
SOIC−8:
G
x = Specific Device Code
0 = NCV7321D10
1 = NCV7321D11
2 = NCV7321D12
DFN8:
y = Specific Device Code
2 = NCV7321MW2
F = Fab Location Code
= (NCV7321D11R2G only)
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G = Pb−Free Package
(Note: Microdot may be in either location)
PIN CONNECTIONS
RxD
EN
WAKE
TxD
1
2
3
4
8
INH
7
VBB
6
LIN
5
GND
SOIC−8 (Top View)
RxD 1
EN 2
WAKE 3
TxD 4
8 INH
7 VBB
EP
6 LIN
5 GND
DFN8 (Top View)
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 12 of this data sheet.
© Semiconductor Components Industries, LLC, 2016
August, 2016 − Rev. 14
1
Publication Order Number:
NCV7321/D
1 page  
NCV7321
FUNCTIONAL DESCRIPTION
Overall Functional Description
LIN is a serial communication protocol that efficiently
supports the control of mechatronic nodes in distributed
automotive applications. The domain is class−A multiplex
buses with a single master node and a set of slave nodes.
The NCV7321 contains the LIN transmitter, LIN receiver,
power−on−reset (POR) circuits and thermal shutdown
(TSD). The LIN transmitter is optimized for the maximum
specified transmission speed of 20 kB with EMC
performance due to reduced slew rate of the LIN output.
The junction temperature is monitored via a thermal
shutdown circuit that switches the LIN transmitter off when
temperature exceeds the TSD trigger level.
The NCV7321 has four operating states (unpowered
mode, standby mode, normal mode and sleep mode) that are
determined by the supply voltage VBB, input signals EN and
WAKE and activity on the LIN bus.
OPERATING STATES
Standby mode
− LIN Transceiver: OFF
− LIN Term: 30 kW
− INH Pin = High
− RxD: Low After a Wake−up/
Floating Otherwise
− TxD: Wake−up Source Flag
EN = High for t > T_enable
Normal mode
− LIN Transceiver: ON
− LIN Term: 30 kW
− INH Pin: High
− RxD: Received LIN Data
− TxD: Weak Pull−down
Transmitter Input
LIN Wake−Up or Local Wake−Up
VBB Above Reset Level
EN = Low for t > T_disable
EN = High for t > T_enable
Unpowered
(VBB Below Reset Level)
− LIN Transceiver: OFF
− LIN Term: Floating
− INH Pin: Floating
− RxD: Floating
− TxD: Weak Pull−down
Sleep Mode
− LIN Transceiver: OFF
− LIN Term: Current Source
− INH Pin: Floating
− RxD: Floating
− TxD: Weak Pull−down
Figure 3. State Diagram
Unpowered Mode
As long as VBB remains below its power−on−reset level,
the chip is kept in a safe unpowered state. LIN transmitter is
inactive, both LIN and INH pins are left floating and only a
weak pull−down is connected on pin TxD. Pin RxD remains
floating.
The unpowered state will be entered from any other state
when VBB falls below its power−on−reset level.
Standby Mode
Standby mode is a low−power mode, where LIN
transceiver remains inactive while INH pin is driven high to
activate an external voltage regulator – see Figure 2.
Depending on the transition which led to the standby mode,
pins RxD and TxD are configured differently during this
mode. A 30 kW resistor in series with a reverse−protection
diode is internally connected between LIN and VBB Pins.
Standby mode is entered in one of the following ways:
• After the voltage level at VBB pin rises above its
power−on−reset level. In this case, RxD Pin remains
high−impedant and the pull−down applied on pin TxD
remains weak.
• After a wake−up event is recognized while the chip was
in the sleep mode. Pin RxD is pulled low while pin
TxD signals the type of wake−up leading to the standby
mode – its pull−up remains weak for LIN wake−up and
it is switched to strong pull−down for the case of local
wake−up (i.e. wake−up via Pin WAKE).
While in the standby mode, the configuration of Pins RxD
and TxD remains unchanged, regardless the activity on
WAKE and LIN Pins – i.e. if additional wake−ups occur
during the standby mode, they have no influence on the chip
configuration.
Normal Mode
In normal mode, the full functionality of the LIN
transceiver is available. Data according the state of TxD
input are sent to the LIN bus while pin RxD reflects the
logical symbol received on the LIN bus – high−impedant for
recessive and Low for dominant. A 30 kW resistor in series
www.onsemi.com
5
5 Page 
TxD
LIN
THREC(max)
THDOM(max)
THREC(min)
THDOM(min)
NCV7321
t BIT t BIT
50%
tBUS_DOM(max)
tBUS_REC(min)
t
tBUS_DOM(min)
tBUS_REC(max)
Thresholds of
receiving node 1
Thresholds of
receiving node 2
t
Figure 6. LIN Transmitter Duty Cycle
TxD
LIN
VBB
ttx_prop_down
tBIT tBIT
50%
t
ttx_prop_up
Figure 7. LIN Transmitter Timing
60% VBB
40% VBB
t
LIN
100%
0%
60%
40%
60%
40%
T_fall
T_rise
Figure 8. LIN Transmitter Rising and Falling Times
t
www.onsemi.com
11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet NCV7321.PDF ] | |
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