NCV7420SystemBasisChipwithLINandLDO-综合文档资源-CSDN文库

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May, 2015 − Rev. 9

1 Publication Order Number:

NCV7420/D

NCV7420

LIN Transceiver with 3.3V

or 5 V Voltage Regulator

General Description

The NCV7420 is a fully featured local interconnect network (LIN)

transceiver designed to interface between a LIN protocol controller

and the physical bus. The transceiver is implemented in I3T

technology enabling both high−voltage analog circuitry and digital

functionality to co−exist on the same chip.

The NCV7420 LIN device is a member of the in−vehicle

networking (IVN) transceiver family of ON Semiconductor that

integrates a LIN v2.0/2.1 physical transceiver and either a 3.3 V or a

5 V 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.

KEY FEATURES

LIN−Bus Transceiver

• LIN compliant to specification revision 2.0 and 2.1

(backward compatible to version 1.3) and J2602

• I3T high voltage technology

• Bus voltage ±45 V

• Transmission rate up to 20 kBaud

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

• System ESD protection level for LIN, WAKE and V

up to ±12 kV

Voltage Regulator

• Output voltage 5 V / ~50 mA or 3.3 V / ~50 mA

• Wake−up input

• Enable inputs for standby and sleep mode

• INH output for auxiliary purposes (switching of an

external pull−up or resistive divider towards battery,

control of an external voltage regulator etc.)

EMI Compatibility

• Integrated slope control

• Meets most demanding EMS/EME requirements

Modes

• Normal mode: LIN communication in either low (up to

10 kBaud) or normal slope

• Sleep mode: V

is switched “off” and no

communication on LIN bus

• Standby mode: V

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 Require−

ments; AEC−Q100 Qualified and PPAP Capable

• These Devices are Pb−Free, Halogen Free/BFR Free

and are RoHS Compliant

www.onsemi.com

See detailed ordering and shipping information in the package

dimensions section on page 19 of this data sheet.

ORDERING INFORMATION

SOIC−14

D SUFFIX

CASE 751AP

PIN CONFIGURATION

GND GND

TxD

RxD

GND

LIN

NCV7420

WAKE

OTP_ZAP

INH

TEST

STB

NCV7420

www.onsemi.com

MARKING DIAGRAM

NCV7420−x

AWLYWWG

NCV7420 = Specific Device Code

−x = −3 = NCV7420D23G

= −4 = NCV7420D24G

= −5 = NCV7420D25G

= −6 = NCV7420D26G

A = Assembly Location

WL = Wafer Lot

Y = Year

WW = Work Week

G = Pb−Free Package

Table 1. KEY TECHNICAL CHARACTERISTICS − 3.3 V version

Symbol Parameter Min Typ Max Unit

Nominal battery operating voltage (Note 1) 5 12 26

Load dump protection (Note 2) 45

BB_SLP

Supply current in sleep mode 20

CC_OUT

(Note 4)

Regulated V

output, V

load 1 mA−30 mA 3.23 3.30 3.37

Regulated V

output, V

load 0 mA−50 mA 3.19 3.30 3.41

OUT_MAX

Maximum V

output current (Note 3) 50 mA

WAKE

Operating DC voltage on WAKE pin 0 V

Maximum rating voltage on WAKE pin −45 45

JSD

Junction thermal shutdown temperature 165 195 °C

Operating junction temperature −40 +150 °C

Table 2. KEY TECHNICAL CHARACTERISTICS − 5 V version

Symbol Parameter Min Typ Max Unit

Nominal battery operating voltage (Note 1) 6 12 26

Load dump protection 45

BB_SLP

Supply current in sleep mode 20

CC_OUT

(Note 4)

Regulated V

output, V

load 1 mA−30 mA 4.9 5.0 5.1

Regulated V

output, V

load 0 mA−50 mA 4.83 5.0 5.17

OUT_MAX

Maximum V

output current (Note 3) 50 mA

WAKE

Operating DC voltage on WAKE pin 0 V

Maximum rating voltage on WAKE pin −45 45

JSD

Junction thermal shutdown temperature 165 195 °C

Operating junction temperature −40 +150 °C

1. Below 5 V on V

in normal mode, the bus will either stay recessive or comply with the voltage level specifications and transition time

specifications as required by SAE J2602. It is ensured by the battery monitoring circuit.

2. The applied transients shall be in accordance with ISO 7637 part 1, test pulse 5. The device complies with functional class C; class A can

be reached depending on the application and external conditions.

3. Thermal aspects of the entire end−application have to be taken into account in order to avoid thermal shutdown of NCV7420.

4. V

voltage regulator output must be properly decoupled by external capacitor of min. 8 mF with ESR < 1 W to ensure stability.

Table 3. THERMAL CHARACTERISTICS

Symbol Parameter Conditions Value Unit

JA1

Thermal resistance junction−to−ambient, 1S0P PCB (Note 5) free air 140 K/W

Thermal resistance junction−to−ambient, 2S2P PCB (Note 6) free air 80 K/W

5. Test board according to EIA/JEDEC Standard JESD51−3, signal layer with 20% trace coverage

6. Test board according to EIA/JEDEC Standard JESD51−7, signal layers with 20% trace coverage

NCV7420

www.onsemi.com

Figure 2. Typical Application Diagram

KL30

LIN−BUS

KL31

LIN

Master Node

1 nF

1kW

GND

NCV7420

Micro

controller

GND

INH

VBAT

GND

10nF

WAKE

LIN

Slave Node

220pF

GND

Micro

controller

VBAT

GND

WAKE

10uF

CC V

10uF

100nF

TESTOTP_ZAP

10nF

GND

INH

BB V

TEST

OTP_ZAP

LIN

WAKE

10uF 100nF

LIN

WAKE

STB

TxD

RxD

NCV7420

STB

TxD

RxD

10uF

Table 4. PIN DESCRIPTION

Pin Name Description

1 V

Battery supply input

2 LIN LIN bus output/input

3 GND Ground

4 GND Ground

5 WAKE High voltage digital input pin to switch the part from sleep− to standby mode

6 INH Inhibit output

7 OTP_ZAP Supply for programming of trimming bits at factory testing, should be grounded in the application

8 TEST Digital input for factory testing, should be grounded in the application

9 EN Enable input, transceiver in normal operation mode when high

10 STB Standby mode control input

11 GND Ground

12 TxD Transmit data input, low in dominant state

13 RxD Receive data output; low in dominant state; push−pull output

14 V

Supply voltage (output)

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.

NCV7420 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

50 mA for supplying any external components

(microcontroller).

NCV7420 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.

NCV7420 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

NCV7420 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 3.

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