Contents
Is CAN isolated?
ADI isolated controller area network (CAN) transceivers provide the differential physical layer interface between the data layer link, hardware protocol (for example, embedded in some of ADI’s Blackfin® processors), and the physical wiring of the CAN bus.
CAN bus over DC power?
The DCAN500 device for CAN-BUS communication over noisy power lines (DC-CAN), supports CAN A/B protocols at speed up 500kbit/s. Multiple CAN networks may share a common DC or AC powerline where each network uses a different carrier frequency. The device avoids complex cabling, saves weight, and simplifies installation.
When does a CAN bus need to be isolated?
At some cases a galvanic isolation is required by international standards. For example a high voltage battery for electric or hybrid vehichles. They usually do not have a connection to the 12V ground and therefore the CAN bus of the battery controller may need galvanic isolation to the 12V Boardnet.
What does a bus in a vehicle Mean?
A bus means that all devices share a common channel of communication. If your device holds the bus in a non-idle condition, it will prevent all other devices from using it (or more precisely, that segment of it).
How is a Controller Area Network ( CAN ) bus used?
A Controller Area Network (CAN bus) is a robust vehicle bus standard designed to allow microcontrollers and devices to communicate with each other in applications without a host computer. It is a message-based protocol, designed originally for multiplex electrical wiring within automobiles to save on copper, but is also used in many other contexts.
How is the dominant state transmitted in a CAN bus?
The dominant state is transmitted by driving CANH towards the device power supply voltage (5 V or 3.3 V), and CANL towards 0 V when transmitting a dominant (0), while the termination resistors pull the bus to a recessive state with CANH at 0 V and CANL at 5 V. This allows a simpler receiver which just considers the sign of CANH−CANL.