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A Multiplexing Communication IC for Automotive Body-Electronic Control
ISSN: 0148-7191, e-ISSN: 2688-3627
Published March 01, 1994 by SAE International in United States
Annotation ability available
In the field of automotive body electronic control such as control of door locks, power windows, and wipers, there is a growing need of multiplexing communication to reduce the amount of wire harnesses. To meet this need, we developed a multiplexing communication protocol particularly suited to the body electronic control. Based on the developed protocol, we designed a communication control IC and a simple driver/receiver circuit with a few discrete components.
The bus access method of the communication is the CSMA/CD with nondestructive bit arbitration, and its bit rate is 5 kbps. Its transmission media is a single wire. The communication IC has a multiplexing control block and a serial I/O block for an interface with a host CPU. It was fabricated using CMOS technology and has a chip of 2.6mm x 3.0mm in size that contains about 5,000 transistors. The driver/receiver circuit consists of one transistor, one capacitor and several resistors. Therefore, the cost of the circuit is quite low.
This paper gives a detailed description of the design specification and features of the communication control IC and the driver/receiver circuit.
CitationShinojima, Y., Kawakami, M., and Kawahashi, A., "A Multiplexing Communication IC for Automotive Body-Electronic Control," SAE Technical Paper 940364, 1994, https://doi.org/10.4271/940364.
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