CXPI transceiver offers alternative to time-critical LIN applications

November 08, 2015 // By Graham Prophet
Rohm Semiconductor has a transceiver IC compatible with the new low-speed, low-cost CXPI communication protocol for use in body control applications, including steering switch, AC, and instrument panel systems; it supports the next-generation vehicle communication protocol for reduced wire count and improved fuel efficiency

The BD41000FJ-C enables multiplexing between ECUs, contributing to decreased vehicle weight and improved fuel efficiency by reducing the number and size of wiring harnesses. In addition, low quiescent current (3 µA typ.) and high ESD resistance (±8 kV, IEC61000-4-2) make it possible to achieve low-power, high-reliability CXPI communication.

To decrease weight, many systems adopt LIN for multiplex communication. However, with LIN it is difficult to achieve sufficient reliability and communication response when multiplexing in real-time HMI (Human Machine Interface) applications such as wipers, lights, and steering switches.

In response, JASO (Japanese Automotive Standards Organization) an automotive standardisation organisation established by JSAE (Society of Automotive Engineers of Japan), developed the next-generation automotive communication protocol CXPI (Clock Extension Peripheral Interface) to reduce the number and weight of wiring harnesses by making multiplexing possible even in advanced, multifunction HMI systems.

In 2012 Rohm contributed to the standardisation of CXPI, and using its power BiCDMOS processes and advanced analogue design technology to develop the first CXPI transceiver IC, yielding low output noise with high ESD resistance (±8kV, IEC61000-4-2). This provides superior reliability, enabling use even under harsh environments.

ROHM Semiconductor;