The receive threshold values VBUS_CNT_max and
參數(shù)資料
型號(hào)： NCV7380DR2
廠商： ON Semiconductor
文件頁(yè)數(shù)： 14/14頁(yè)
文件大小： 0K
描述： IC TRANSCEIVER LINEAR 8-SOIC
產(chǎn)品變化通告： Product Discontinuation 21/Jun/2007
標(biāo)準(zhǔn)包裝： 2,500
類型： 收發(fā)器
驅(qū)動(dòng)器/接收器數(shù)： 1/1
規(guī)程： LIN
電源電壓： 7 V ~ 18 V
安裝類型： 表面貼裝
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
供應(yīng)商設(shè)備封裝： 8-SOICN
包裝： 帶卷 (TR)
NCV7380
http://onsemi.com
9
The receive threshold values VBUS_CNT_max and
VBUS_CNT_min are symmetrical to 0.5*VS with a hysteresis
of 0.16*VS (typ). The LIN specific receive threshold is
between 0.4*VS and 0.6*VS.
The received BUS signal will be output to the RxD pin:
BUS < VBUS_CNT – 0.5 * VHYS
→ RxD = low (BUS dominant)
BUS > VBUS_CNT + 0.5 * VHYS
→ RxD = high, floating (BUS recessive)
RxD is a buffered open drain output with a typical load
of:
Resistance: 2.7 k
W
Capacitance: < 20 pF
Data Rate
The NCV7380 is a constant slew rate transceiver. The
bus driver operates with a fixed slew rate range of 1.0 V/
ms
v DV/DT v 3.0 V/ms. This principle provides very good
symmetry of the slope times between recessive to dominant
and dominant to recessive slopes within the LIN bus load
range (CBUS, Rterm).
The NCV7380 guarantees data rates up to 20 kBit within
the complete bus load range under worst case conditions.
The constant slew rate principle holds appropriate voltage
levels and can operate within the LIN Protocol
Specification for RC oscillator systems with a matching
tolerance up to 2%.
Operating Under Disturbance
Loss of Battery
If VS and VCC are disconnected from the battery, the bus
pin is in high impedance state. There is no impact to the bus
traffic.
Loss of Ground
In case of an interrupted ground connection from VS and
VCC, there is no influence to the bus line.
Short Circuit BUS to Battery
The transmitter output current is limited to 200 mA
(max) in case of short circuit to battery.
Short Circuit BUS to Ground
Negative voltages on the bus pin are limited to current
through the internal 30 k resistor and series diode from VS.
Thermal Overload
The NCV7380 is protected against thermal overloads. If
the chip temperature exceeds the thermal shutdown
threshold, the transmitter is switched off until thermal
recovery. The receiver continues to work during thermal
shutdown.
Undervoltage VCC
The VCC undervoltage lockout feature disables the
transmitter until it is above the undervoltage lockout
threshold to prevent undesirable bus traffic.
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
1.0
V
Voltage Drop of Bus Decouple Diode in the Master Node
VDrop_dec
0.4
1.0
V
Battery Offset Voltage
Vbatoff
0.1
VBAT
Ground Offset Voltage
Vgoff
0.1
VBAT
Master Termination Resistor
Rpu_master
900
1000
1100
W
Slave Termination Resistor
Rpu_slave
20
30
60
kW
Number of System Nodes
N
2
16
Network Distance between any two ECU Nodes
BUS_length
40
m
Line Capacitance
CLINE
100
150
pF/m
Capacitance of Master Node
CMaster
220
pF
Capacitance of Slave Node
CSlave
195
220
300
pF
Network Total Capacitance
Ct1
1.0
4.0
10
nF
Network Total Resistance
Rt1
537
863
W
Time Constant of Overall System
tnet
1.0
5.0
ms
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