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SN65HVD230: Communicate between SN65HVD230 and SN65HVD251

Part Number: SN65HVD230
Other Parts Discussed in Thread: SN65HVD251,

Because of the SN65HVD230 has shortage issue, so some of device need to change the CAN to SN65HVD251.

If one side we use SN65HVD230(VCC is 3V ~3.6V) and the other side is SN65HVD251(VCC is 4V ~ 5V). May I know it’s capable to communicate each other? And It has any Sid effect. Thanks

BR Gary

  • Yes. The differential voltage on the CAN bus is 2 V. This is independent from the supply voltage.

  • My question is that one device of VCC is 3.3V, to communicate other device VCC is 5V. May I know it is able to communicate each other? And It has any Sid effect. Thanks

    BR, Gary

  • Hi Gary,

    Yes, the SN65HVD230 is designed to be compatible with 5V CAN buses and is capable of generating differential signals that meet the dominant-level specifications of 5V transceivers. The primary impact of using a 3.3V transceiver in a system like this will be that the common-mode generated by the 3.3V transceiver will be lower than the 2.5V (Vcc/2) recessive level from other 5V transceivers. This will cause some common-mode changes while the 3.3V transceiver is driving the bus. Similarly, because the recessive output voltage of the 3.3V transceiver is slightly lower (2.3V), the recessive level of the bus may be lower than the typical 2.5V. These differences in the common-mode will have minimal-to-no impact on the actual differential signal and therefore CAN data. It is important to note that this common-mode shifting will impact the EMC characteristics of the system. 

    Let me know if this is clear or if there are any specific concerns regarding the heterogeneous use of 3.3V and 5.V transceivers. 

    Regards,
    Eric Schott