SN65HVD233-EP: CAN BUS PROBLEMS

VICTOR BEST

Part Number: SN65HVD233-EP

CAN BUS INTERFACE:

SN65HVD233HD - BEST PRACTICES WHEN USING CAN NETWORK ?

HAVING ONE PAIR OF CAN DEVICES THE SYSTEM EXHIBITS NO COMMS ERRORS, AS SOON AS WE ADD THIRD OR FOURTH CAN DEVICE NETWORK FAILS (SUPPLY=3.3V).

HARDWARE CONTROL OF THE DEVICE: SHOULD ONCE MESSAGE BE SENT THE CONTROL PIN 'LBK' BE ACTIVATED ?

I NOTE THAT COMMON MODE CHOKES HAVE BEEN ADVISED TO REDUCE SPIKES, BUT IDEALLY WOULD LIKE TO KNOW BEST PRACTICE IMPLEMENTATION OF CAN ON A NETWORK SHOULD EVERY CAN DEVICE BE TERMINATED WITH 120 OHMS, SO AS WE MOVE TO 4 NODES WE HAVE 120//120//120//120.

THANK YOU FOR YOUR HELP.

over 6 years ago

0 Wade Vonbergen over 6 years ago

TI__Guru 62930 points

Victor,

CAN bus is terminated only on each end of the bus.

Please see this document and datasheet.

If this answers your question, please click "This Resolved My Issue"
Regards,
Wade

0 VICTOR BEST over 6 years ago in reply to Wade Vonbergen

Intellectual 350 points

Thank you for that information.

We are not out of the woods yet, as the way the system is configured is that each of these can devices provide a different discrete function, so we have between two and up to six can devices that might be plugged in at any time. what do we do only terminate two devices and leave the other four devices un-terminated? This might be possible is this what you mean?

Thanks in advance.

Victor

0 Wade Vonbergen over 6 years ago in reply to VICTOR BEST

TI__Guru 62930 points

The termination should exist on each end of the bus, and not on each device.

That way it does not matter what nodes are attached. It always is properly terminated.

Regards,

Wade

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SN65HVD233-EP: CAN BUS PROBLEMS