Support for 18LF26K22 and 18LF45K22


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    Junior Member Radio's Avatar
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    Default Support for 18LF26K22 and 18LF45K22

    Hi, I've had planned to use the 18LF26K22 and 18LF45K22 for some projects. Both are on the list of the supported devices but they are not recognised by the compiler. The "F" versions are recognised. Wanted to use the "LF" to be able to get straight into low voltage logic. Is there a work around to get the "LF" going?
    Thanks
    Greg

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    Senior Member Mellbreak's Avatar
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    Default Re: Support for 18LF26K22 and 18LF45K22

    Hi Radio,

    Welcome to the forum!

    The F and LF versions are functionally the same, the only difference being the voltage range that can be tolerated by each type of device. So, even though you are using the LF version , set the compiler to F version i.e. Device = 18F26K22.

    Hope this makes sense.


    Bob

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    Prolific Poster towlerg's Avatar
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    Default Re: Support for 18LF26K22 and 18LF45K22

    The more recent PIC devices work over such a large range that it is rarely necessary to use LF devices. At what voltage are you trying to work?

    If you try to program a LF device which you have told Proton it's a normal F device, most programmers will balk because the device ID is different for both devices (see errata for ID's).

    Seems like LF gives you 2.3v to 1.8V
    Last edited by towlerg; 10th November 2019 at 16:22.
    George.

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    Senior Member Mellbreak's Avatar
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    Default Re: Support for 18LF26K22 and 18LF45K22

    Good point George, is the device ID in the PPI file I wonder. Perhaps it would be possible to make a copy of the appropriate 16F files and alter the ID to suit the 16LF. If I can find the time I might have a look and see what I can find out.

    Bob

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    Prolific Poster John Drew's Avatar
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    Default Re: Support for 18LF26K22 and 18LF45K22

    My experience is to tell the compiler it is a F device and tell the programmer it is an LF device. That way both are happy.
    I still use MPLAB 8.92 for the programmer just in case that is important.
    John

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    Default Re: Support for 18LF26K22 and 18LF45K22

    That would make sense John and gives a practical solution.

    Bob

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    Junior Member Radio's Avatar
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    Default Re: Support for 18LF26K22 and 18LF45K22

    Thanks for your help. Fooling the programmer seems to work.
    Greg

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    Default Re: Support for 18LF26K22 and 18LF45K22

    As has been mentioned, use the F device if the LF device is not in the compiler's PPI files.

    There is no difference in the device mechanisms, except the LF types have a different power rating. When time permits, I'll go through the PPI and def files and rename some of the F types to LF types as well.

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