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NCV7361A Datasheet(PDF) 18 Page - ON Semiconductor

Part No. NCV7361A
Description  Voltage Regulator with Integrated LIN Transceiver
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Maker  ONSEMI [ON Semiconductor]
Homepage  http://www.onsemi.com
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NCV7361A Datasheet(HTML) 18 Page - ON Semiconductor

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NCV7361A
http://onsemi.com
18
APPLICATION HINTS
LIN System Parameter
Bus Loading Requirements
Parameter
Symbol
Min
Typ
Max
Unit
Operating Voltage Range
VBAT
8.0
18
V
Voltage Drop of Reverse Protection Diode
VDrop_rev
0.4
0.7
1.0
V
Voltage Drop at the Series Diode in Pull Up Path
VSerDiode
0.4
0.7
1.0
V
Battery Shift Voltage
VShift_BAT
0
0.1
VBAT
Ground Shift Voltage
VShift_GND
0
0.1
VBAT
Master Termination Resistor
Rmaster
900
1000
1100
W
Slave Termination Resistor
Rslave
20
30
60
k
W
Number of System Nodes
N
2
16
Total Length of Bus Line
LENBUS
40
m
Line Capacitance
CLINE
100
150
pF/m
Capacitance of Master Node
CMaster
220
pF
Capacitance of Slave Node
CSlave
220
250
pF
Total Capacitance of the Bus including Slave and Master Capacitance
CBUS
1.0
4.0
10
nF
Network Total Resistance
RNetwork
537
863
W
Time Constant of Overall System
t
1.0
5.0
ms
Recommendations for System Design
The goal of the LIN physical layer standard is to have a
universal definition of the LIN system for plug and play
solutions in LIN networks up to 20 kbd bus speeds.
In case of small and medium LIN networks, it’s
recommended to adjust the total network capacitance to at
least 4.0 nF for good EMC and EMI behavior. This can be
done by setting only the master node capacitance. The
slave node capacitance should have a unit load of typically
220 pF for good EMC/EMI behavior.
In large networks with long bus lines and the maximum
number of nodes, some system parameters can exceed the
defined limits and the LIN system designer must intervene.
The whole capacitance of a slave node is not only the unit
load capacitor itself. Additionally, there is the capacitance
of wires and connectors, and the internal capacitance of the
LIN transmitter. This internal capacitance is strongly
dependent on the technology of the IC manufacturer and
should be in the range of 30 pF to 150 pF. If the bus lines
have a total length of nearly 40m, the total bus capacitance
can exceed the LIN system limit of 10 nF.
A second parameter of concern is the integrated slave
termination resistor tolerance. If most of the slave nodes
have a slave termination resistance near by the allowed
maximum of 60 k
W, the total network resistance is more
than 700
W. Even if the total network capacitance is below
or equal to the maximum specified value of 10 nF, the
network time constant is higher than 7.0
ms.
This problem can be solved only by adjusting the master
termination resistor to the required maximum network time
constant of 5.0
ms (max).
The LIN bus output driver of the NCV7361A provides a
higher drive capability than necessary (40 mA @ 1.2 V)
within the LIN standard (33.6 mA @ 1.2 V). With this
driver stage the system designer can increase the maximum
LIN networks with a total network capacitance of more
than 10 nF.
The
total
network
resistance
can
be
decreased to:
Rtl_min + (VBat_max * VBUSdom) IBUS_max
+ (18 V * 1.2 V) 40 mA + 420 W
NOTE: The NCV7361A meets the requirements for
implementation in RC−based slave nodes. The LIN
Protocol Specification requires the deviation of the slave
node clock to the master node clock after synchronization
must not differ by more than
"2%.
Setting the network time constant is necessary in large
networks (primary resistance) and also in small networks
(primary capacitance).


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