NCV7380(2004) Ver la hoja de datos (PDF) - ON Semiconductor

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componentes Descripción

Fabricante

NCV7380
(Rev.:2004)

LIN Transceiver

ON Semiconductor 

NCV7380

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 kW

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%.

Application Hints

LIN System Parameter

Bus Loading Requirements

Parameter

Operating Voltage Range

Voltage Drop of Reverse Protection Diode

Voltage Drop of Bus Decouple Diode in the Master Node

Battery Offset Voltage

Ground Offset Voltage

Master Termination Resistor

Slave Termination Resistor

Number of System Nodes

Network Distance between any two ECU Nodes

Line Capacitance

Capacitance of Master Node

Capacitance of Slave Node

Network Total Capacitance

Network Total Resistance

Time Constant of Overall System

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.

Symbol

Min

VBAT

8.0

VDrop_rev

0.4

VDrop_dec

0.4

Vbatoff

−

Vgoff

−

Rpu_master

900

Rpu_slave

20

N

2

BUS_length

−

CLINE

−

CMaster

−

CSlave

195

Ct1

1.0

Rt1

537

τnet

1.0

Typ

−

−

−

−

−

1000

30

−

−

100

220

220

4.0

−

−

Max

18

1.0

1.0

0.1

0.1

1100

60

16

40

150

−

300

10

863

5.0

Unit

V

V

V

VBAT

VBAT

W

kW

−

m

pF/m

pF

pF

nF

W

ms

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