CAN/CANopen® FAQ

Q: How do I connect a CAN controller to the bus?

A: The most common form is to use a differential transceiver. One of the most popular transceivers is the Philips PCA82C251 high-speed, differential signal transceiver. Datasheet at:

http://www.semiconductors.philips.com/pip/PCA82C251T

Notes:

• The "Tx" pin of the CAN controller goes to the "Tx" pin of the transceiver.
• The "Rx" pin of the CAN controller goes to the "Rx" pin of the transceiver.
• The "Rs" (slope) control of the transceiver is set to GND (high speed mode) in most applications. If EMI is a problem in your application, consider other operating modes.
• The "Vref" is an output of the transceiver that in many applications can be left unconnected.

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