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V1.02 | 2018-10-11
An Introduction
CAN FD

2
u
Why CAN FD?
What is CAN FD?
CAN FD Use Cases
Automotive Application Domains
CAN FD Frame
CAN FD Controller
CAN FD Performance
CAN FD Devices
CAN FD Standardization
Summary
References
Agenda

3
Why CAN FD?
Many CAN buses have reached 50 % … 95 % network load level
1. Network speed limited to 1 Mbit/s (typical ≤ 500 kbit/s)
u Limited by physical characteristics of in-vehicle wiring due to the
In-Frame response mechanism:
u ACK generation delay in CAN controller
u Propagation delay through the transceiver
u Propagation delay over wire
2. CAN messages contain ≥ 50 % overhead
u Other protocols have less overhead
u Ethernet UDP – ~1500 bytes/datagram, 64 bytes overhead (IPv4)
u FlexRay – 254 bytes/frame, 8 bytes of overhead
CAN_H
CAN_L
CAN ECU
R
T
CAN ECU

4
Why CAN FD?
u
What is CAN FD?
CAN FD Use Cases
Automotive Application Domains
CAN FD Frame
CAN FD Controller
CAN FD Performance
CAN FD Devices
CAN FD Standardization
Summary
References
Agenda

6
What is CAN FD?
u CAN FD is an improved CAN protocol (based on CAN 2.0)
u Two features added:
u Changes limited to CAN controller hardware
1. Support dual bit rates within a message
u Arbitration Phase: same bit rate as standard CAN
u Data Phase: bit rates up to 5 Mbit/s depending on the application
small software change needed (due to change of timing)
2. Support larger payload (data length)
u Up to 64 bytes/message
larger software change needed
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