To function, the CAN bus needs power, which is typically sourced from the vehicle's battery. The battery provides the necessary voltage to power the CAN transceiver and the microcontroller on the CAN bus. The voltage range for the CAN bus is typically between 9-16 volts.
The beauty of the CAN bus design is that it can operate with minimal power consumption, making it ideal for automotive systems where every gram and watt counts. It also has the added advantage of being able to power down to low power consumption modes when the system is inactive, further conserving energy.
In summary, the CAN bus gets its power from the vehicle's battery, and its low power consumption and ability to go into low power modes make it ideal for use in automotive systems.
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