Automotive Semiconductors and Functional Safety
Which correctly describes a feature of CAN FD?
- AArbitration is performed at the same speed as conventional CAN, only the data phase switches to a faster bit rate, and up to 64 bytes can be sent per frame
- BIt uses optical fiber instead of copper wire to send the same maximum of 8 bytes of data as conventional CAN at higher speed
- CIt eliminates arbitration and divides time into slots, switching to a time-triggered scheme in which each node's transmission time is predetermined, making it much faster
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Answer: A. Arbitration is performed at the same speed as conventional CAN, only the data phase switches to a faster bit rate, and up to 64 bytes can be sent per frame
Conventional CAN (Classical CAN) runs at up to 1 Mbit/s with up to 8 bytes of data per frame. CAN FD performs the arbitration phase, in which all nodes must see the bits aligned, at the conventional speed and switches only the data phase to a speed of several Mbit/s. Data length also increases to up to 64 bytes, making software reprogramming and sensor data transmission more efficient. It does not use optical fiber, and the time-triggered scheme is a feature of FlexRay.
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