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MCP2551 can be replaced with SN65HVD251P

walter osorio
Prodigy 110 points
Other Parts Discussed in Thread: SN65HVD251

Good day,

I want to comunicata three PIC18F258 from microchip,  using the SN65HVD251P transceiver, is that possible? if not, what transceiver should I use?

Thanks.

  • 0
    TI__Mastermind 21346 points

    Hi Walter,

    I am not too familiar with the PIC18F258 microcontroller but I believe there is only one CAN controller built in. You mention connecting 3 transceivers. Are you planning on having 3 PIC microcontrollers and 3 external CAN transceivers?

    Both the MCP2551 and the SN65HVD251 devices have slope control mode, low-power standby mode and normal high speed mode with a VREF output and are pin to pin equivalent. You will be able to replace the mCP2551 with the SN65HVD251 without any issues as long as you are not working with a 24 volt system. The SN65HVD251 was only designed for 12 volt applications.

    What is the highest voltage that the bus pins can be exposed to in your application. Thanks,

    John

  • 0 in reply to John Griffith
    Prodigy 110 points

    Hi john,

    Thanks for answering, thats wright, I need three microcontrollers and each one with  a CAN transceiver.

    I would like to transmit in a 5 volt system, after getting down from a 24 volt system.

    Actually I could have problems designing the source of the system, couse the noise of the vehicules, as you know, and I can not find a guide to solve this problem

    Again, thanks for your help.

  • 0 in reply to walter osorio
    TI__Mastermind 21346 points

    Hi Walter,

    If you have some questions about designing a power supply that runs off a double battery system, I would recommend posting your questions in the automotive forum. We have a group that does automotive power supplies and they should be able to show you some EVMs or reference designs to point you in the right direction.

    The forum is locating below:

    http://e2e.ti.com/support/applications/automotive/f/26.aspx

    Thanks,

    John

  • 0 in reply to John Griffith
    Prodigy 110 points

    John,

    I' ll do that, thanks