5 Description (continued)

The LIN Protocol output data stream on the TXD pin is converted by the TPIC1021 into the LIN bus signal

through a current limited, wave-shaping low-side driver with control as outlined by the LIN Physical Layer

Specification Revision 2.1. The receiver converts the data stream from the LIN bus and outputs the data stream

via the RXD pin.

In Low Power mode, the TPIC1021 requires very low quiescent current even though the wake-up circuits remain

active allowing for remote wake up via the LIN bus or local wake ups via NWake or EN pins.

The TPIC1021 has been designed for operation in the harsh automotive environment. The device can handle

LIN bus voltage swing from 40 V down to ground and survive –40 V. The device also prevents back feed current

through the LIN pin to the supply input in case of a ground shift or supply voltage disconnection. It also features

under-voltage, over temperature, and loss of ground protection. In the event of a fault condition the output is

immediately switched off and remains off until the fault condition is removed.

6 Pin Configuration and Functions

1

RXD

8

INH

2

ED

7

VSUP

3

NWake

6

LIN

4

TXD

5

GND

Not to scale

Figure 6-1. D Package, 8-Pin SOIC

Table 6-1. Pin Functions

PIN

TYPE

DESCRIPTION

NO.

NAME

1

RXD

O

RXD output (open drain) pin interface reporting state of LIN bus voltage

2

ED

I

Enable input pin

3

NWake

I

High voltage input pin for device wake up

4

TXD

I

TXD input pin interface to control state of LIN output

5

GND

I

Ground connection

6

LIN

I/O

LIN bus pin single wire transmitter and receiver

7

VSUP

Supply

Device supply pin (connected to battery in series with external reverse blocking diode)

8

INH

O

Inhibit pin controls external voltage regulator with inhibit input

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TPIC1021

SLIS113E – OCTOBER 2004 – REVISED MAY 2022

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