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PDF NCV7420 Data sheet ( Hoja de datos )
| Número de pieza | NCV7420 | |
| Descripción | LIN Transceiver | |
| Fabricantes | ON Semiconductor | |
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NCV7420
LIN Transceiver with 3.3 V
or 5 V Voltage Regulator
General Description
The NCV7420 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 NCV7420 LIN device is a member of the in−vehicle
networking (IVN) transceiver family of ON Semiconductor that
integrates a LIN v2.0/2.1 physical transceiver and either a 3.3 V or a
5 V voltage regulator.
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.
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PIN CONFIGURATION
14
1
VBB
LIN
GND
SOIC−14
D SUFFIX
CASE 751AP
GND
WAKE
INH
OTP_ZAP
1
2
3
4
5
6
7
14
13 VCC
RxD
12
TxD
11
GND
10
STB
9
EN
8
TEST
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 19 of this data sheet.
KEY FEATURES
LIN−Bus Transceiver
• LIN compliant to specification revision 2.0 and 2.1
(backward compatible to version 1.3) and J2602
• I3T high voltage technology
• Bus voltage ±45 V
• Transmission rate up to 20 kBaud
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
• System ESD protection level for LIN, WAKE and VBB
up to ±12 kV
Voltage Regulator
• Output voltage 5 V / ~50 mA or 3.3 V / ~50 mA
• Wake−up input
• Enable inputs for standby and sleep mode
• INH output for auxiliary purposes (switching of an
external pull−up or resistive divider towards battery,
control of an external voltage regulator etc.)
EMI Compatibility
• Integrated slope control
• Meets most demanding EMS/EME requirements
Modes
• Normal mode: LIN communication in either low (up to
10 kBaud) or normal slope
• Sleep mode: VCC is switched “off” and no
communication on LIN bus
• Standby mode: VCC is switched “on” but there is no
communication on LIN bus
• Wake−up bringing the component from sleep mode into
standby mode is possible either by LIN command or
digital input signal on WAKE pin. Wake−up from LIN
bus can also be detected and flagged when the chip is
already in standby mode.
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
© Semiconductor Components Industries, LLC, 2015
May, 2015 − Rev. 9
1
Publication Order Number:
NCV7420/D
1 page  
NCV7420
Power off
Power up VBB
VBB > VBB_UV_th
Standby mode
−VCC: “on”
−LIN TX: “off”
−Term: “current source”
−INH: “floating”
−RxD: pull−up to VCC/low
EN goes from 0 to 1 while TxD = 1,
and VCC > VCC_UV_th and VBB > VBB_UV_th
EN goes from 1 to 0
while STB = 1 or VBB < VBB_UV_th
Normal mode
(normal slope)
−VCC: “on”
−LIN TX: “on”
−Term: 30 kW
−INH: “high”/“floating”
−RxD: LIN Data (push−pull)
Note:
LIN Transmitter is “off” when
VBB < VBB_UV_th
Local wake−up
or LIN wake−up
Normal mode
(low slope)
−VCC: “on”
−LIN TX: “on”
−Term: 30 kW
−INH: “high”/“floating”
−RxD: LIN data (push−pull)
EN goes from 1 to 0
while STB = 0 and VBB > VBB_UV_th
Sleep mode
−VCC: “off”
−LIN TX: “off”
−Term: “current source”
−INH: “floating”
−RxD: pull−up to VCC
Figure 3. State Diagram
Table 5. MODE SELECTION
Mode
VCC
RxD
Normal −
Slope
ON Low = Dominant State
High = Recessive State
INH
High if STB=High during state
transition; Floating otherwise
LIN
Normal
Slope
30 kW on LIN
ON
Note
(Note 7)
Normal −
Low Slope
ON Low = Dominant State High if STB=High during state Low Slope
High = Recessive State transition; Floating otherwise
ON
(Note 8)
Standby
ON Low after LIN wake−up,
high otherwise
Floating
OFF
OFF
(Notes 9
and 10)
Sleep
OFF
Clamped to VCC
Floating
OFF
OFF
7. The normal slope mode is entered when pin EN goes HIGH while TxD is in HIGH state during EN transition.
8. The low slope mode is entered when pin EN goes HIGH while TxD is in LOW state during EN transition. LIN transmitter gets on only after
TxD returns to high after the state transition.
9. The standby mode is entered automatically after power−up.
10. In standby mode, RxD High state is achieved by internal pull-up resistor to VCC.
Normal Slope Mode
In normal slope mode the transceiver can transmit and
receive data via LIN bus with speed up to 20 kBaud. The
transmit data stream of the LIN protocol is present on the
TxD pin and converted by the transmitter into a LIN bus
signal with controlled slew rate to minimize EMC emission.
The receiver consists of the comparator that has a threshold
with hysteresis in respect to the supply voltage and an input
filter to remove bus noise. The LIN output is pulled HIGH
via an internal 30 kW pull-up resistor. For master
applications it is needed to put an external 1 kW resistor with
a serial diode between LIN and VBB (or INH). See Figure 2.
The mode selection is done by EN=HIGH when TxD pin is
HIGH. If STB pin is high during the standby-to-normal
slope mode transition, INH pin is pulled high. Otherwise, it
stays floating.
Low Slope Mode
In low slope mode the slew rate of the signal on the LIN
bus is reduced (rising and falling edges of the LIN bus signal
are longer). This further reduces the EMC emission. As a
consequence the maximum speed on the LIN bus is reduced
up to 10 kBaud. This mode is suited for applications where
the communication speed is not critical. The mode selection
is done by EN=HIGH when TxD pin is LOW. In order not
to transmit immediately a dominant state on the bus (because
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5
5 Page 
NCV7420
Table 8. DC CHARACTERISTICS – 5 V version
(VBB = 6 V to 26 V; TJ = −40°C to +150°C; Bus Load = 500 W (VBB to LIN); unless otherwise specified.)
Symbol
Parameter
Conditions
Min
Typ Max Unit
SUPPLY − Pin VBB
IBB_ON
Supply current
IBB_STB
Supply current
IBB_SLP
Supply current
VOLTAGE REGULATOR − Pin VCC
VCC_OUT
Regulator output voltage
IOUT_MAX_ABS
Absolute maximum output current
Normal mode; LIN recessive
Standby mode,
VBB = 6–18 V,
TJ < 105°C
Sleep mode, VBB = 6–18 V,
TJ < 105°C
VCC load 1 mA − 30 mA
VCC load 0 mA − 50 mA
Thermal shutdown must be
taken into account
4.9
4.83
1.6 mA
70 mA
20 mA
5.0 5.1
V
5.0 5.17
50 mA
IOUT_LIM
DVCC_OUT
VDO
Overcurrent limitation
Line Regulation (Note 28)
Load Regulation (Note 28)
Dropout Voltage (VBB−VCC_OUT)
Figure 19 (Notes 27, 28)
LIN TRANSMITTER − Pin LIN
VBB 6−26 V, IOUT = 5 mA,
TJ = 25°C
IOUT 1−50 mA, VBB = 14 V,
TJ = 25°C
IOUT = 1 mA, TJ = 25°C
IOUT = 10 mA, TJ = 25°C
IOUT = 50 mA, TJ = 25°C
50
100 170 mA
0.9 mV
74 mV
13 mV
136 mV
794 mV
VLIN_dom_LoSup LIN dominant output voltage
VLIN_dom_HiSup
LIN dominant output voltage
VLIN_rec
LIN Recessive Output Voltage (Note 23)
ILIN_lim
Short circuit current limitation
RSLAVE
Internal pull−up resistance
CLIN
Capacitance on pin LIN (Note 25)
LIN RECEIVER − Pin LIN
TxD = low; VBB = 7.3 V
TxD = low; VBB = 18 V
TxD = high; ILIN = 10 mA
VLIN = VBB_MAX
VBB − 1.5
40
20
33
15
1.2 V
2.0 V
VBB V
200 mA
47 kW
25 pF
Symbol
Parameter
Conditions
Min Typ Max Unit
Vbus_dom
Bus voltage for dominant state
0.4 VBB
Vbus_rec
Bus voltage for recessive state
0.6 VBB
Vrec_dom
Receiver threshold
LIN bus recessive → dominant
0.4
0.6 VBB
Vrec_rec
Receiver threshold
LIN bus dominant → recessive
0.4
0.6 VBB
Vrec_cnt
Receiver center voltage
(Vrec_dom + Vrec_rec) / 2
0.475
0.525 VBB
Vrec_hys
Receiver hysteresis
(Vrec_rec − Vrec_dom)
0.05
0.175 VBB
ILIN_off_dom
LIN output current bus in dominant state
Driver off; VBB = 12 V;
VLIN = 0 V
−1
mA
ILIN_off_rec
LIN output current bus in recessive state
Driver off; VBB < 18 V
VBB < VLIN < 18 V
1 mA
23. The voltage drop in Normal mode between LIN and VBB pin is the sum of the diode drop and the drop at serial pull−up resistor. The drop
at the switch is negligible. See Figure 1.
24. By one of the trimming bits, following reconfiguration can be done during chip−level testing in order to fit the NCV7420−5 into different
interface: pins TxD and EN will have typ. 10 kW pull−down resistor to ground and pin WAKE will have typ. 10 mA pull−up current source.
25. Guaranteed by design. Not tested.
26. VBB undervoltage threshold is always higher than VBB POR low level (VBB_UV_th > PORL_VBB)
27. Measured at output voltage VCC_OUT = (VCC_OUT@VBB = 6 V) – 2%.
28. Values based on design and characterization. Not tested in production.
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11
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet NCV7420.PDF ] | |
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