News Release from: Allegro MicroSystems Europe
Edited by the Electronicstalk Editorial Team on 26 May 2003
Automotive transceivers take power onboard
A family of LIN bus transceivers with integrated voltage regulators has been developed by Allegro MicroSystems.
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A family of LIN bus transceivers with integrated voltage regulators has been developed by Allegro MicroSystems. The LIN (Local Interconnect Network) bus is a low-cost serial communications bus based on an open standard developed by a consortium of organisations in the automotive sector. Unlike the more sophisticated CAN and J1850 buses, it is intended to provide relatively low-speed communication for controlling on/off devices and simple sensor/actuator applications.
LIN bus systems are based around a single-master/multiple-slave concept using a low-cost single-wire implementation with speeds up to 20Kbit/s and self-synchronisation with no requirement for crystals or resonators.
Most LIN nodes within an automotive system require a LIN interface plus a regulated voltage, which is normally provided by a separate voltage-regulator IC.
However, any regulators used in this application have to withstand the automotive environment.
"Since the LIN interface has to withstand the automotive environment in any case, Allegro engineers decided to remove the need for the additional regulator", comments Allegro's European Technical Manager Bob Christie: "This allows the user to build a simple LIN node without the need for additional regulator circuits".
The initial product offering from Allegro will include three LIN bus transceiver interface ICs: the A8421 with a 50mA linear regulator with an 'enable' function; the A8422 with a 200mA switched-mode regulator; and the A8423 with a permanently enabled 50mA linear regulator.
All the devices are compatible with LIN bus 1.2 systems, and are specifically designed to withstand automotive transients and ESD effects.
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