CAN Buses
Last updated
Last updated
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.
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.
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.
