CAN FD (CAN with Flexible Data Rate) is an improvement of CAN protocol (based on CAN2.0), what is the difference between CAN and CAN FD?
Compared with CAN protocol, CAN-FD has two new features:
1, support variable rate
A) The arbitration section is the same as the standard CAN rate
B) data segment: rate up to 8Mbit/s
2. Support a larger payload
A) The frame length can be up to 64 bytes
Characteristics CAN be seen as follows: Advantages of CAN-FD:
Faster write rate
Avoid splitting data into multiple frames
Reduce the bus load on the existing bus
Avoid splitting the network
Through the above elaboration, CAN-FD CAN alleviate the problem of insufficient bandwidth resources of CAN bus to a certain extent. At present, some domestic Oems mainly use CAN-FD protocol in two ways: one is to fix the communication content and only increase the packet length; The other is the idea of AUTOSAR, which uses the idea of PDU to achieve more flexible applications.