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Número de pieza NCV7425
Descripción LIN Transceiver
Fabricantes ON Semiconductor 
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NCV7425
LIN Transceiver with
Voltage Regulator and
Reset Pin
General Description
The NCV7425 is a fully featured local interconnect network (LIN)
transceiver designed to interface between a LIN protocol controller
and the physical bus.
The NCV7425 LIN device is a member of the in−vehicle
networking (IVN) transceiver family of ON Semiconductor that
integrates a LIN v2.1 physical transceiver and a low−drop 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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MARKING
DIAGRAM
16
16
1
SOIC−16 LEAD
WIDE BODY
EXPOSED PAD
CASE 751AG
NCV7425−x
AWLYYWWG
x = 0 or 5
1
A = Assembly Location
WL = Wafer Lot
YY = Year
WW = Work Week
G = Pb−Free Package
Features
LIN−Bus Transceiver
LIN compliant to specification revision 2.1
(backward compatible to versions 2.0 and 1.3) and
J2602
Bus Voltage ±45 V
Transmission Rate up to 20 kBaud
Integrated Slope Control for Improved EMI
Compatibility
Package
SOIC−16 Wide Body Package with Exposed Pad
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
ESD Protection Level for LIN, INH, WAKE and
VBB up to ±10 kV
Voltage Regulator
Two Device Versions: Output Voltage 3.3 V or 5 V
For Loads up to 150 mA
Undervoltage Detector with a Reset Output to the
Supplied Microcontroller
INH Output for Auxiliary Purposes (switching of an
external pull−up or resistive divider towards battery,
control of an external voltage regulator etc.)
ORDERING INFORMATION
Modes
See detailed ordering and shipping information in the
package dimensions section on page 19 of this data sheet.
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
Requirements; AEC−Q100 Qualified and PPAP
Capable
These Devices are Pb−Free, Halogen Free/BFR Free
and are RoHS Compliant
Typical Applications
Automotive
Industrial Networks
© Semiconductor Components Industries, LLC, 2015
May, 2015 − Rev. 3
1
Publication Order Number:
NCV7425/D

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NCV7425 pdf
NCV7425
Table 4. MODE SELECTION
Mode
VCC
RxD
INH
Normal −
ON Low = Dominant State High if STB = High
Slope (Note 3)
High = Recessive State during state transition;
Floating otherwise
LIN
Transceiver
Normal Slope
30 kW on LIN
ON
RSTN
High
Normal − Low ON Low = Dominant State High if STB = High
Slope (Note 4)
High = Recessive State during state transition;
Floating otherwise
Low Slope
ON
High
Standby
(Note 5)
ON Low after LIN
wake−up, High
otherwise (Note 6)
Floating
OFF
OFF
Controlled by VCC
undervoltage
monitor
Sleep
OFF Clamped to VCC
(Note 6)
Floating
OFF
OFF
Low
3. The normal slope mode is entered when pin EN goes High while TxD is in High state during EN transition.
4. 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.
5. The standby mode is entered automatically after power−up.
6. In standby and Sleep mode, the High state is achieved by internal pull−up resistor to VCC.
VBB power−up
Standby mode
VCC: on
−LIN TRX: off
−INH: floating
−LIN term.: current source
−RxD pin: High/Low
−RSTN pin: VCC_UV
EN changes 0−>1 while TxD=1
EN changes 1−>0 while STB=1
VCC undervoltage
Normal mode
(normal slope )
VCC: on
−LIN TRX: on
−INH: High/floating
−LIN term.: 30kW
−RxD pin: LIN data
−RSTN pin: High
Normal mode
(low slope )
VCC: on
−LIN TRX: on
−INH: High/floating
−LIN term.: 30kW
−RxD pin: LIN data
−RSTN pin: High
EN changes 1−>0 while STB=0
Figure 4. State Diagram
Sleep mode
VCC: off
−LIN TRX: off
−INH: floating
−LIN term.: current source
−RxD pin: at VCC
−RSTN pin: Low
PD20090610 .01
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
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NCV7425 arduino
NCV7425
Table 7. DC CHARACTERISTICS − 5 V VERSION
VBB = 6 V to 28 V; TJ = −40°C to +150°C; unless otherwise specified.
Symbol
Parameter
Conditions
Min Typ Max Unit
DC CHARACTERISTICS SUPPLY − PINS VBB AND VCC
IBB_ON
Supply current
IBB_STB
Supply current
IBB_SLP
Supply current
DC CHARACTERISTICS − VOLTAGE REGULATOR
Normal mode; LIN recessive
Standby mode, VBB = 6 − 18 V,
TJ < 105°C
Sleep mode, VBB = 6 − 18 V,
TJ < 105°C
1.6 mA
60 mA
20 mA
VCC_OUT
Regulator output voltage
IOUT_LIM
VCC_UV_THR
DVCC_OUT
Vdo
Overcurrent limitation
Undervoltage detection threshold
Line Regulation
Load Regulation
Dropout Voltage (VBB − VCC_OUT)
(Note 15)
(Figure 20)
DC CHARACTERISTICS LIN TRANSMITTER
VCC load 0 − 100 mA
100 mA < VCC load < 150 mA
VBB 6 − 28 V, Iout = 5 mA
TJ = 25°C
Iout 1 − 100 mA, VBB = 14 V,
TJ = 25°C
Iout = 10 mA, TJ = 25°C
Iout = 50 mA, TJ = 25°C
Iout = 100 mA, TJ = 25°C
4.9 5 5.1
4.85 5 5.15
150 225 300
4.25 4.5 4.75
0.41
22
22
108
216
V
V
mA
V
mV
mV
mV
mV
mV
VLIN_dom_LoSup
VLIN_dom_HiSup
VLIN_rec
LIN dominant output voltage
LIN dominant output voltage
LIN recessive output voltage
(Note 16)
TxD = Low; VBB = 7.3 V
TxD = Low; VBB = 18 V
TxD = High; ILIN = 10 mA
VBB −
1.5
1.2 V
2.0 V
VBB V
ILIN_lim
Short circuit current limitation
Rslave
Internal pull−up resistance
CLIN
Capacitance on pin LIN (Note 17)
DC CHARACTERISTICS LIN RECEIVER
VLIN = VBB(max)
40 200 mA
20 33 47 kW
25 35 pF
VBUS_dom
VBUS_rec
Vrec_dom
Vrec_rec
Vrec_cnt
Vrec_hys
ILIN_off_dom
bus voltage for dominant state
bus voltage for recessive state
Receiver threshold
Receiver threshold
Receiver center voltage
Receiver hysteresis
LIN output current bus in dominant
state
LIN bus recessive dominant
LIN bus dominant recessive
(Vrec_dom + Vrec_rec) / 2
(Vrec_rec − Vrec_dom)
Driver off; VBB = 12 V, VLIN = 0 V
0.6
0.4
0.4
0.475
0.05
−1
0.4
0.6
0.6
0.525
0.175
VBB
VBB
VBB
VBB
VBB
VBB
mA
ILIN_off_rec
LIN output current bus in recessive
state
Driver off; VBB < 18 V,
VBB < VLIN < 18 V
1 mA
ILIN_no_GND
Communication not affected
VBB = GND = 12 V;
0 < VLIN < 18 V
−1
1 mA
ILIN_no_VBB
LIN bus remains operational
VBB = GND = 0 V;
0 < VLIN < 18 V
5 mA
15. Measured at output voltage VCC_OUT = (VCC_OUT @ VBB = 6 V) − 2%.
16. 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 2.
17. Guaranteed by design. Not tested
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