Transcription of A CAN Physical Layer Discussion - Microchip …
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A CAN Physical Layer Discussion - Microchip …
M AN228. A CAN Physical Layer Discussion The Physical Medium Attachment (PMA) and Medium Author: Pat Richards Dependent Interface (MDI) are the two parts of the Microchip Technology Inc. Physical Layer which are not defined by CAN. The Physical Signaling (PS) portion of the Physical Layer is INTRODUCTION defined by the CAN specification. The system designer Many network protocols are described using the seven can choose any driver/receiver and transport medium Layer Open System Interconnection (OSI) model, as as long as the PS requirements are met. shown in Figure 1. The Controller Area Network (CAN) The International Standards Organization (ISO) has protocol defines the Data Link Layer and part of the defined a standard which incorporates the CAN speci- Physical Layer in the OSI model. The remaining physi- fication as well as the Physical Layer . The standard, cal Layer (and all of the higher layers) are not defined by ISO-11898, was originally created for high-speed in- the CAN specification.
2002 Microchip Technology Inc. Preliminary DS00228A-page 5 AN228 MCP2551 CAN TRANSCEIVER The MCP2551 is a CAN Transceiver that implements the ISO-11898-2 physical layer specification.
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