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.
Features
♦
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MARKING
DIAGRAM
16
SOIC−16 LEAD
WIDE BODY
EXPOSED PAD
CASE 751AG
x
A
WL
YY
WW
G
16
1
NCV7425−x
AWLYYWWG
1
= 0 or 5
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
ORDERING INFORMATION
•
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
V
BB
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.)
•
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: V
CC
is Switched “off” and No
Communication on LIN Bus
Standby Mode: V
CC
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
1
May, 2015 − Rev. 3
Publication Order Number:
NCV7425/D
NCV7425
Table 1. KEY TECHNICAL CHARACTERISTICS
Symbol
3.3 V VERSION
V
BB
V
BB
I
BB
_SLP
V
CC_OUT
(Note 2)
I
OUT_LIM
V
WAKE
Nominal battery operating voltage
Load dump protection (Note 1)
Supply current in sleep mode
Regulated V
CC
output in normal mode, V
CC
load 0−100 mA
Regulated V
CC
output in normal mode, 100 mA < V
CC
load < 150 mA
V
CC
regulator current limitation
Operating DC voltage on WAKE pin
Maximum rating voltage on WAKE pin
V
INH
T
J_TSD
T
J
5 V VERSION
V
BB
V
BB
I
BB_SLP
V
CC_OUT
(Note 2)
I
OUT_LIM
V
WAKE
Nominal battery operating voltage
Load dump protection (Note 1)
Supply current in sleep mode
Regulated V
CC
output in normal mode, V
CC
load 0−100 mA
Regulated V
CC
output in normal mode, 100 mA < V
CC
load < 150 mA
V
CC
regulator current limitation
Operating DC voltage on WAKE pin
Maximum rating voltage on WAKE pin
V
INH
T
J_TSD
T
J
Operating DC voltage on INH pin
Junction thermal shutdown temperature
Operating junction temperature
4.90
4.85
150
0
−45
0
165
−40
5
5
225
6
12
28
45
20
5.10
5.15
300
V
BB
45
V
BB
195
+150
V
°C
°C
V
V
mA
V
V
mA
V
Operating DC voltage on INH pin
Junction thermal shutdown temperature
Operating junction temperature
3.234
3.201
150
0
−45
0
165
−40
3.3
3.3
225
5
12
28
45
20
3.366
3.399
300
V
BB
45
V
BB
195
+150
V
°C
°C
mA
V
V
V
mA
V
Parameter
Min
Typ
Max
Unit
1. The applied transients shall be in accordance with ISO 7637 part 1, test pulse 5. The device complies with functional class C;. The LIN
communication itself complies with functional class B. On regulator class A can be reached depending on the application and external
components
2. V
CC
voltage must be properly stabilized by external capacitors: capacitor of min. 80 nF with ESR < 10 mW in parallel with a capacitor of min.
8
mF,
ESR < 1
W.
Table 2. THERMAL CHARACTERISTICS
Symbol
R
th(vj−a)_1
R
th(vj−a)_2
R
th(vj−a)_3
R
th(vj−a)_4
Parameter
Thermal resistance junction−to−ambient on JEDEC 1S0P PCB
Thermal resistance junction−to−ambient on JEDEC 1S0P + 300 mm
2
PCB
Thermal resistance junction−to−ambient on JEDEC 2S2P PCB
Thermal resistance junction−to−ambient on JEDEC 2S2P + 300 mm
2
PCB
Conditions
Free Air
Free Air
Free Air
Free Air
Value
138
94
70
49
Unit
K/W
K/W
K/W
K/W
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2
NCV7425
V
CC
NCV7425
V−
reg
Band−
gap
V
BB
INH
WAKE
V
CC
V
BB
POR
V
CC
STB
EN
Control Logic
V
CC
Thermal
shutdown
Osc
V
BB
TxD
V
CC
RxD
Receiver
V
CC
LIN
Timeout
Slope
Control
RSTN
GND
TEST
OTP _ZAP
PD20090609 .1
Figure 1. Block Diagram
TYPICAL APPLICATION
Application Information
The EMC immunity of the Master−mode device can be
further enhanced by adding a capacitor between the LIN
output and ground. The optimum value of this capacitor is
determined by the length and capacitance of the LIN bus, the
number and capacitance of Slave devices, the pull−up
resistance of all devices (Master and Slave), and the required
time constant of the system, respectively.
Master Node
VBAT
10uF
100nF
10uF
100nF
V
CC
voltage must be properly stabilized by external
capacitors: capacitor of min. 80 nF (ESR < 10 mW) in
parallel with a capacitor of min. 8
mF
(ESR < 1
W).
The 10
mF
capacitor on the battery is optional and serves
as reservoir capacitor to deal with battery supply
micro−cuts.
Slave Node
VBAT
10uF
100nF
10uF
100nF
V
BB
INH
V
CC
RxD
TxD
V
CC
INH
V
BB
V
CC
RxD
TxD
V
CC
1kW
NCV 7425
LIN
LIN
Micro
EN
LIN
LIN
Micro
EN
1 nF
STB
WAKE
RSTN
TEST
220 pF
controller
controller
STB
WAKE
RSTN
TEST
WAKE
10nF
WAKE
10nF
OTP_ZAP
GND
OTP_ZAP
GND
GND
GND
GND
GND
PD20090609
.2
KL30
LIN−
BUS
KL31
Figure 2. Application Diagram
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3
NCV7425
V
BB
LIN
GND
GND
WAKE
INH
OTP_SUP
n.c.
1
2
3
NCV7425
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
RxD
TxD
RSTN
STB
EN
TEST
n.c.
Figure 3. Pin Assignment
Table 3. PIN FUNCTION DESCRIPTION
Pin Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin Name
V
BB
LIN
GND
GND
WAKE
INH
OTP_SUP
n.c.
n.c.
TEST
EN
STB
RSTN
TxD
RxD
V
CC
Battery supply input
LIN bus output/input
Ground
Ground
High voltage digital input pin to switch the part from sleep− to standby mode
Inhibit output
Supply for programming of trimming bits at factory testing, needs to be grounded in the application
not connected
not connected
Digital input for factory testing, needs to be grounded in the application
Enable input for mode control
Standby mode control input
Reset output; open−drain output with an on−chip pull−up resistor
Transmit data input, Low in dominant state
Receive data output; Low in dominant state; push−pull output
Voltage regulator output
Description
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.
NCV7425 is designed as a master or slave node for the
LIN communication interface with an integrated 3.3 V or
5 V voltage regulator having a current capability up to
150 mA for supplying any external components
(microcontroller, CAN node, etc.).
NCV7425 contains the LIN transmitter, LIN receiver,
voltage regulator, power−on−reset (POR) circuits and
thermal shutdown (TSD). The LIN transmitter is optimized
for the maximum specified transmission speed of 20 kBaud
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 and
voltage regulator off when temperature exceeds the TSD
trigger level.
NCV7425 has four operating states (normal mode, low
slope mode, standby mode, and sleep mode) that are
determined by the input signals EN, WAKE, STB, and TxD.
Operating States
NCV7425 provides four operating states, two modes for
normal operation with communication, one standby without
communication and one low power mode with very low
current consumption − see Figure 4 and Table 4.
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4
NCV7425
Table 4. MODE SELECTION
Mode
Normal −
Slope (Note 3)
Normal − Low
Slope (Note 4)
Standby
(Note 5)
Sleep
V
CC
ON
RxD
Low = Dominant State
High = Recessive State
Low = Dominant State
High = Recessive State
Low after LIN
wake−up, High
otherwise (Note 6)
Clamped to V
CC
(Note 6)
INH
High if STB = High
during state transition;
Floating otherwise
High if STB = High
during state transition;
Floating otherwise
Floating
LIN
Transceiver
Normal Slope
30 kW on LIN
ON
RSTN
High
ON
Low Slope
ON
High
ON
OFF
OFF
Controlled by V
CC
undervoltage
monitor
Low
OFF
Floating
OFF
OFF
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 V
CC
.
Normal mode
(normal slope )
−
V
CC
: on
−LIN TRX: on
−INH: High/floating
−LIN term.: 30kW
−RxD pin: LIN data
−RSTN pin: High
Standby mode
V
BB
power−up
−
V
CC
: on
−LIN TRX: off
−INH: floating
−LIN term.: current source
−RxD pin: High/Low
−RSTN pin:
V
CC_UV
EN changes 0− while TxD=1
>1
EN changes 1− while STB=1
>0
V
CC
undervoltage
EN changes 1− while STB=1
>0
EN changes 1− while STB=0
>0
EN changes 0− while TxD=0
>1
Normal mode
(low slope )
−
V
CC
: on
−LIN TRX: on
−INH: High/floating
−LIN term.: 30kW
−RxD pin: LIN data
−RSTN pin: High
EN changes 1− while STB=0
>0
V
CC
undervoltage
Sleep mode
−
V
CC
: off
−LIN TRX: off
−INH: floating
−LIN term.: current source
−RxD pin:
at V
CC
−RSTN pin: Low
PD20090610 .01
Figure 4. State Diagram
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 V
BB
(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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