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CAN protocol

QuestionAnswer
CAN meaning? Controller Area Network.
Who created it? Created by Bosch.
Which node can start the communication? Communication could be started by any node
CAN FD meaning? Controller Area Network Flexible Data
CAN FD pros? Increased length: up to 64 data bytes per data frame vs. 8 data bytes for Classical CAN Increased speed: up to 5 Mbit/s
CAN FD FRAME parts IDLE SOF ID RRS IDE EDL BRS ESI DLC DATA CRCD ACK ACKD EOF IFS
How many masters are in CAN? CAN It is multimaster. Frame size = 8 Bytes of data, Up to 112 nodes
CAN FRAME parts SOF RTR CONTROL DATA CRC ACK EOF
What kind of duplex is CAN? Simplex = Send > Receive Full-duplex = Send > Receive, Receive < Send (At the same time is sending and receiving) Half-duplex = Send > Receive, Receive < Send (Not possible at the same time is sending and receiving) CAN is half-duplex
Is it parallel or serial? Parallel communication = N of bits > 1 Serial communication = N of bits = 1 CAN is serial communication protocol
How are the CANH and CANL cables? Why? With what ends? Why? Twisted pair = CanHigh and CanLow. It is twisted pair for noise immunity, Twisted pair ends with a 120 ohms resistor for impedance matching = minimize signal reflection
What is a logic 1? Recessive bit = CANH and CANL are equal to 2.5 v
What is a logic 0? Dominant bit = CANH equal to 3.5v CANL equal to 1.5 v
CAN speed? 1 MbPS. 1 MbPS at 40 mts
Is it synchronous? CAN is asynchronous = It can start to communicate whenever it wants. Nodes know when a message is started and when is ended, it is not necessary a clock signal to know when start to transmit. Synchronous = It has to wait a clock signal to transmit.
what is Bit stuffing? después de cada secuencia de 5 bits iguales (sean ceros o unos) que se transmiten, se inserta automáticamente un bit de polaridad opuesta.
Created by: yizuztineo
 

 



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