Understanding Microchip s CAN Module Bit Timing

2001 Microchip Technology 1 MAN754 INTRODUCTIONThe Controller Area Network (CAN) protocol is anasynchronous serial bus with Non-Return to Zero(NRZ) bit coding designed for fast, robust communica-tions in harsh environments, such as automotive andindustrial applications. The CAN protocol allows theuser to program the bit rate, the sample point of the bit,and the number of times the bit is sampled. With thesefeatures, the network can be optimized for a are relationships between bit Timing parameters,the physical bus propagation delays, and the oscillatortolerances throughout the system. This applicationnote investigates these relationships as they pertain toMicrochip s CAN Module and assists in optimizing thebit Timing for given physical system CAN BIT TIMEThe CAN bit time is made up of non-overlapping seg-ments. Each of these segments are made up of integerunits called Time Quanta (TQ) and are explained laterin this application note.

AN754 DS00754A-page 2 2001 Microchip Technology Inc. SAMPLE POINT The sample point is the point in the bit time in which the logic level is read and interpreted.

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