1 Features

• LIN physical layer specification revision 2.1

compliant conforms to SAEJ2602 recommended

practice for LIN

• LIN bus speed up to 20 kbps

• ESD protection to 12 kV (human body model) on

LIN pin

• LIN pin handles voltage from –40 V to 40 V

• Survives transient damage in automotive

environment (ISO 7637)

• Operation with supply from 7-V to 27-V DC

• Two operation modes: normal and low-power

(sleep) mode

• Low current consumption in low power mode

• Wake-up available from LIN bus, wake-up input

(external switch) or host MCU

• Interfaces to MCU with 5-V or 3.3-V I/O pins

• Dominant state timeout protection on TXD pin

• Wake-up request on RXD pin

• Control of external voltage regulator (INH Pin)

• Integrated pull-up resistor and series diode for LIN

responder applications

• Low EME (electromagnetic emissions), high EMI

(electromagnetic immunity)

• Bus terminal short-circuit protected for short to

battery or short to ground

• Thermally protected

• Ground disconnection fail-safe at system level

• Ground shift operation at system level

• Unpowered node does not disturb the network

2 Applications

• Industrial sensing

• White goods distributed control

3 Description

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 internal pull-up resistor (30 kΩ)

and series diode, so no external pullup components

are required for responder applications. Commander

applications require an external pullup resistor (1 kΩ)

plus a series diode.