TPIC1021
LIN Physical Interface
www.ti.com
SLIS113–OCTOBER 2004
FEATURES
•
Dominant State Timeout Protection on TXD
Pin
•
LIN Physical Layer Specification Revision 2.0
compliant. Conforms to SAEJ2602
Recommended Practice for LIN
•
•
Wake-Up Request on RXD Pin
Control of External Voltage Regulator (INH
Pin)
•
•
LIN Bus Speed up to 20 kbps
ESD Protection to 12 kV (Human Body Model)
on LIN Pin
•
•
•
Integrated Pull-Up Resistor and Series Diode
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
Input (External Switch) or Host MCU
Unpowered Node Does Not Disturb the
Network
Interfaces to MCU with 5 V or 3.3 V I/O Pins
D PACKAGE
(TOP VIEW)
RXD
EN
NWake
TXD
INH
1
2
3
4
8
7
6
5
V
SUP
LIN
GND
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’s internal pull-up resistor (30kΩ) and series
diode, so no external pull-up components are required for slave applications. Master applications require an
external pull-up resistor (1kΩ) 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.
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