Power Loss in CAN Transceivers

Devendra,

The answer will depend on a lot of things, including which transciever you use, what state the transceiver is in, how many nodes there are in you network, how active the specific node in question is communicating and if there are any bus faults like short to ground. For example:

A trypical CAN transceiver will 40-60mA in a dominant state while in normal mode, and around 10mA in a recessive state in normal mode. Therefore if the if a device on a bus is actively communicating 10% of the time (50% dominant bits and 50% recessive bits on average), and always in normal mode, the device will consume on average consume 14mA of current (10mA * 0.9+50mA * 0.1). This is obviously just a rough estimate.

Like I said this will vary if the node is communicating more, has more dominant bits in its payload, or if there is a fault. Typically a transceiver will draw around 100mA of current if the CAN bus lines are shorted to ground when trying to transmit a dominant bit.

If you have more of an idea of which device you are using I would be happy to work with you on estimating current consumption.

Thanks,

John