A8423 Datasheet, PDF (1/8 Pages) Allegro MicroSystems – LIN Bus Transceiver with Integrated Voltage Regulator

Preliminary
Subject to Change without Notice
February 9, 2004
A8423
LIN Bus Transceiver with Integrated Voltage Regulator
A8423
SOIC
RX 1
EN 2
WAKE 3
TX 4
Regulator
Control
8 VREG
7 VSUP
6 LIN
5 GND
The A8423 provides the physical interface requirements of the LIN
(Local Interconnect Network) serial communications bus plus an inte-
grated voltage regulator that is permanently enabled. These allow the
development of simple, inexpensive slave nodes in a LIN-Bus system.
The LIN transceiver is compatible with LIN-Bus systems that conform
to the LIN Protocol Specification, Revision 1.2. It provides all the
necessary interface and timing control to convert signals to and from
the bidirectional LIN Bus to individual transmit and receive signals at
logic-compatible levels.
The A8423 provides regulated 5V output with a current limit in excess
of 50 mA. This is sufficient to power a microcontroller handling the
LIN slave node protocol.
The A8423 is supplied in 8-lead plastic SOIC (part number suffix L).
ABSOLUTE MAXIMUM RATINGS
Supply Voltage, VSUP Continuous.....................30 V
Supply Voltage, VSUP Transient (500 ms).........40 V
LIN Bus Voltage, LIN........................... –18 to +40 V
Wake Pin ............................................... –18 to +40 V
Logic Pins: RX, TX, EN ...................... –0.3 V to 7 V
Package Power Dissipation, P_D ......see chart, page 6
Operating Temperature Range
Ambient Temperature, T_A ..........–40°C to +125°C
Junction Temperature, T_J ...........–55°C to +150°C
Storage Temperature, T_S ..........–55°C to +150°C
FEATURES
Compatible with LIN Bus, Revision 1.2 systems
Data rate up to 20 kbaud
Normal operation from 7 to 30 V
Handles 40 V transients during load dump
Handles automotive transients per ISO 7637
Unpowered node does not disturb the network
4 kV (hbm) ESD protection on LIN and WAKE pins
Low quiescent current regulator for slave microcontroller supply
Interface to slave microcontroller
8-pin small outline surface mount package
APPLICATIONS
Automotive, industrial, and consumer LIN-Bus systems
Use the following complete part number when ordering:
Part Number
Package
Description
A8423KL
8-lead, SOIC
Continuous voltage regulator