NCV7425

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4

Figure 3. Pin Assignment

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

LIN

GND

GND

WAKE

INH

OTP_SUP

n.c.

RxD

TxD

RSTN

STB

EN

TEST

n.c.

Table 3. PIN FUNCTION DESCRIPTION

Pin Number

Pin Name

Description

1

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_SUP

Supply for programming of trimming bits at factory testing, needs to be grounded in the application

8

n.c.

not connected

9

n.c.

not connected

10

TEST

Digital input for factory testing, needs to be grounded in the application

11

EN

Enable input for mode control

12

STB

Standby mode control input

13

RSTN

Reset output; open−drain output with an on−chip pull−up resistor

14

TxD

Transmit data input, Low in dominant state

15

RxD

Receive data output; Low in dominant state; push−pull output

16

Voltage regulator output

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.