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TMS320F280025C-Q1: Internal Oscillator Compensation

Ray Vincent Aranzaso
Genius 13515 points
Part Number: TMS320F280025C-Q1

Hi, 

Good Day. Our customer is looking for examples of Internal Oscillator Compensation for TMS320F280025C-Q1. Thank you very much.

Best Regards,

Ray Vincent

  • 0
    TI__Mastermind 27205 points

    Hi Ray Vincent,

    Could you please let me know what is the intended application where the customer will be using the F280025C device using the internal oscillator, their target clock tolerance as well as ambient temperature for the application?  At the moment, there is no oscillator compensation support on F28002x so wanted to understand the clock requirement to see if we can offer alternatives that exist on the F28002x family.

    Thanks and regards,

    Joseph

  • 0 in reply to Joseph Casuga
    TI__Genius 13515 points

    Hi Joseph,

    Good Day. Please see below the response of our customer to your reply. Thank you very much.

    "Our application is inverters whose frequency has to be kept constant for temperature variations and also we have to use internal crystal."

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Mastermind 27205 points

    Hi Ray,

    Internal oscillator specs for F28002x family across entire temperature range is 10MHz +/-2%.  If customer application requires minimal frequency variations across temperature, which is outside of the +/-2% internal oscillator tolerance, then best option would be to choose an external crystal instead.

    Best regards,

    Joseph

  • 0 in reply to Joseph Casuga
    TI__Genius 13515 points

    Hi Joseph,

    Good Day. Please see below the response of our customer to your reply. Thank you very much.

    We are already using F28x family with internal oscillator and oscillator compensation.

    So we must use internal oscillator for some application.

    So, Kindly organize oscillator compensation codes for F280025 MCU.

    Best Regards,

    Ray Vincent

  • 0 in reply to Ray Vincent Aranzaso
    TI__Mastermind 27205 points

    Hi Ray,

    Can you please confirm which previous F28x device is being used by the customer?  If they are using  F2802x or F2803x family of devices, internal oscillator compensation will work since the oscillator/temperature curve has linear response.  The internal oscillator design in F28002x (as well as in F28004x and more recent devices) is different in that the oscillator/temperature curve is non-linear, making it difficult to do frequency compensation.

    Can you e-mail me details of this project (who is our customer, what is the end application/product and what is the projected volume they are looking at) to see if there are other alternatives to offer?

    Thanks and regards,

    Joseph