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, the authors developed a multiplexing communication protocol particularly suited to the body electronic control. Based on the developed protocol, the authors 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 2.6 mm x 3.0 mm in size that contains about 5000 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.
A multiplexing communication IC for automotive body-electronic control
Ein Multiplex-Kommunikations-IC für die elektronische Steuerung selbstgetriebener Systeme
1994
8 Seiten, 13 Bilder, 5 Tabellen, 2 Quellen
Conference paper
English
Multiplex , Kommunikationssystem , elektronische Steuerung , Übertragungsprotokoll , Systementwurf , formale Spezifikation , Systembeschreibung , Systemeigenschaft , Treiberstufe , Bussystem , Datendurchsatz , Nachrichtenübertragungstechnik , Empfangsgerät , lokales Netz , Leistungsmessung , digitale integrierte Schaltung , Kraftfahrzeugelektrik
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