9 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and

TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

9.1 Application Information

The TPIC1021 can be used as both a responder device and a commander device in a LIN network. It comes

with the ability to support both remote wake-up requests and local wake-up requests.

9.2 Typical Application

The device comes with an integrated 30-kΩ pullup resistor and series diode for responder applications, and for

commander applications an external 1-kΩ pullup with series blocking diode can be used. Figure 9-1 shows the

device being used in both types of applications.

bat

VBAT

VSUP

TPIC7xxxx

VSUP

VDD

VDD

VDD

VSUP

INH

NWake

TPIC1021

MCU

COMMANDER

NODE

TMS430

TMS470

LIN

Controller

or

SCI/UART1

EN

RXD

TXD

MCU w/o

pull−up2

VDD I/O

GND

2

8

3

7

1

4

5

6

Commander

Pull−Up3

1 kW

LIN

220 pF

VSUP

TPIC7xxxx

VSUP

VDD

VDD

VSUP

INH

NWake

TPIC1021

MCU

TMS430

TMS470

LIN

Controller

or

SCI/UART1

EN

TXD

MCU w/o

pull−up 2

VDD I/O

GND

2

8

3

7

1

4

5

6

LIN

220 pF

RXD

RESPONDER

NODE

Node

A.

See 1 in the Section 9.2.1 section

B.

See 2 in the Section 9.2.1 section

C.

See 3 in the Section 9.2.1 section

Figure 9-1. Typical Application Schematic

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TPIC1021

SLIS113E – OCTOBER 2004 – REVISED MAY 2022

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