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.