NCV7425：带LIN和150mA LDO稳压器的系统基础芯片-综合文档

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NCV7425

www.onsemi.com

Figure 3. Pin Assignment

LIN

GND

WAKE

INH

OTP_SUP

n.c.

RxD

TxD

RSTN

STB

TEST

n.c.

NCV7425

Table 3. PIN FUNCTION DESCRIPTION

Pin Number 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_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 V

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.

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NCV7425：带LIN和150mA LDO稳压器的系统基础芯片-综合文档

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