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Hot!The maximum operating frequency of the PIC24FJ256GA110

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Moe kin
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2021/01/13 01:20:04 (permalink)
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The maximum operating frequency of the PIC24FJ256GA110

Hello!
 
I would like to ask about the maximum operating frequency of the PIC24FJ256GA110 as shown in the title.
 
First of all, I checked the data sheet that says it can work up to 16MIPS at 32Mhz. And PLL mode can be operated up to 32Mhz by X4 at 8Mhz.
 
According to my PCB environment and ex-boss's progarmming configuration.
12Mhz OSC  has been mounted on the PCB. And PRIPLL mode has Been set.
 
And UxBRG of UART and PRx of Timer are declared in accordance with 48Mhz.
(I also visually checked the OSC mounted as 12Mhz on the board to avoid OSC specification changes were not reflected in the circuit diagram.)
 
ALL WORKING WELL AT 48Mhz.

Under these circumstances, the specifications of the datasheet and the configuration of my product dont match
and I was wondering how it would be possible.
 
 
 
->
1. Can I say that the PIC works beyond the clock specification? For what reason does it work?

2. If I can operate at frequencies beyond the specification, what is the possible maximum clock over the specification?

3. What are some of the problems that can be expected or unexpected when using frequencies over 32Mhz?
 
Best regards.
Thanks in advance.
#1

3 Replies Related Threads

    mlp
    boots too small
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    Re: The maximum operating frequency of the PIC24FJ256GA110 2021/01/15 13:33:00 (permalink)

    Mark (this opinion available for hire)
    #2
    ric
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    Re: The maximum operating frequency of the PIC24FJ256GA110 2021/01/15 13:44:55 (permalink)
    4 (1)
    Moe kin
    1. Can I say that the PIC works beyond the clock specification? For what reason does it work?

    No device will stop working the moment you overstep a design limit.
    However, the moment you do, YOU are responsible for any obscure failure at the limits of supply voltage, temperature etc.

    2. If I can operate at frequencies beyond the specification, what is the possible maximum clock over the specification?

    Impossible to predict.
    This will vary by chip batch, supply voltage, and temperature.


    3. What are some of the problems that can be expected or unexpected when using frequencies over 32Mhz?

    Failure to work as specified in the datasheet.
    No-one can predict exactly what or where the failure will be.
    If you choose to exceed the maximums listed in the datasheet, then it is YOUR RESPONSIBILITY to fully test the device under all possible conditions to ensure it still works reliably.
    (Note, this is simply not feasible for most users)
     
    Bottom line, exceed the manufacturer's specifications at your own risk.
    If it's a one-off, sometimes you can push the limits.
    If it's a commercial product, I hope I never buy any from your company.
     

    I also post at: PicForum
    Links to useful PIC information: http://picforum.ric323.co...opic.php?f=59&t=15
    NEW USERS: Posting images, links and code - workaround for restrictions.
    To get a useful answer, always state which PIC you are using!
    #3
    Aussie Susan
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    Re: The maximum operating frequency of the PIC24FJ256GA110 2021/01/15 19:11:43 (permalink)
    4 (1)
    OP - you see , this is the problem with making SO MANY duplicate posts.
    I made the same points that Ric made yesterday to one of the other duplicates. However it is easy to miss a reply in all those duplicates.
    So it seems that both Ric and I have wasted our time.
    Susan
    #4
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