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FEATURES

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2

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RXD

EN

NWake

TXD

INH

LIN

GND

D PACKAGE

(TOP VIEW)

DESCRIPTION

TPIC1021

LIN Physical Interface

SLIS113 – OCTOBER 2004

•

Dominant State Timeout Protection on TXD

Pin

•

LIN Physical Layer Specification Revision 2.0

compliant. Conforms to SAEJ2602

•

Wake-Up Request on RXD Pin

Recommended Practice for LIN

•

Control of External Voltage Regulator (INH

•

LIN Bus Speed up to 20 kbps

Pin)

•

ESD Protection to 12 kV (Human Body Model)

•

Integrated Pull-Up Resistor and Series Diode

on LIN Pin

for LIN Slave Applications

•

LIN Pin Handles Voltage from -40 V to +40 V

•

Low EME (Electromagnetic Emissions), High

EMI (Electromagnetic Immunity)

•

Survives Transient Damage in Automotive

Environment (ISO 7637)

•

Bus Terminal Short-Circuit Protected for

Short to Battery or Short to Ground

•

Operation with Supply from 7 V to 27 V DC

•

Thermally Protected

•

Two Operation Modes: Normal and Low

Power (Sleep) Mode

•

Ground Disconnection Fail Safe at System

Level

•

Low Current Consumption in Low Power

Mode

•

Ground Shift Operation at System Level

•

Wake-Up Available from LIN Bus, Wake-Up

•

Unpowered Node Does Not Disturb the

Input (External Switch) or Host MCU

Network

•

Interfaces to MCU with 5 V or 3.3 V I/O Pins

The TPIC1021 is the LIN (Local Interconnect Network) physical interface, which integrates the serial transceiver

with wake up and protection features. The LIN bus is a single wire, bi-directional bus typically used for low-speed

in-vehicle networks using baud rates between 2.4 kbps and 20 kbps.

The LIN bus has two logical values: the dominant state (voltage near ground) represents a logic ‘0’ and the

recessive state (voltage near battery) and represents logic ‘1’.

In the recessive state the LIN bus is pulled high by the TPIC1021’s internal pull-up resistor (30k

Ω) and series

diode, so no external pull-up components are required for slave applications. Master applications require an

external pull-up resistor (1k

Ω) plus a series diode.

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 2.0. 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.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCT PREVIEW information concerns products in the forma-

Copyright © 2004, Texas Instruments Incorporated

tive or design phase of development. Characteristic data and other

specifications are design goals. Texas Instruments reserves the

right to change or discontinue these products without notice.