CAN Buses

Location of CAN Bus Connectors

CAN Connectors

There are six independent CAN FD capable CAN buses, each with two connectors. The dual connectors are only for convenience in forming a bus and or plugging in a CAN termination board.

Bus Name	CAN PHY	Type
CAN0, CAN1	TJA1443	CAN FD
CAN2, CAN3	TJA1463	CAN FD, SIC (Signal Improvement CAN)
CAN4, CAN5	TJA1153	CAN FD, SCT (Secure CAN Transceiver)

Connectors P12 through P23 are the CAN connectors. For each “CANx” bus connector the pinout is as follows (where x = BUS number 0 to 5):

Pin #	Signal	Specification
1	5V4	5.4V output
2	CANx_H	5.0V
3	CANx_L	5.0V
4	GND	0V

Pin 1 of each CAN connector is available to supply 5V to externally connected CAN devices. This optionally may be used to supply limited power to a CAN peripheral. A blocking diode prevents powering the CANHUBK344 from the CAN BUS.

CAN_P5V4 power output R69 disconnect

CAN Termination

A CAN bus usually requires 60 Ohm termination at both ends of a CAN bus. This may be accomplished using one of the included CAN-TERM boards.

Each can bus connects to TWO identical connectors labelled A and B. This is to allow for daisy chain wiring and multiple drops along a can bus. Should the MR-CANHUB344 be the end of the CAN bus and require termination, then termination may be provided by plugging in a termination board or populating (soldering) the normally unpopulated termination resistors directly on the board.

CAN bus representative schematic

CAN SIC Termination

Note that the CAN SIC PHYs are able to operate with stub connections and potentially a single or central termination. The signal integrity should be validated against your specific system configuration.