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IEC60730SWPACKAGES: Calibration of the internal clocks is required for UL certification

Jim Chen (SEM)
Intellectual 2330 points
Part Number: IEC60730SWPACKAGES

Hi experts,

My customer need to do calibration of the clock due to UL certification based on F28035.  Can they use cpu timer and watchdog counter to compare to do calibration of the clock? Or does TEST_OSCILLATOR part of IEC60730 lib calibrate two internal oscillator clocks actually?

By the way, I find that F2800137 and F280039C has DCC module to do calibration of the clock. Can the DCC module to compare two internal oscillator clocks?

BR

Jim

  • 0
    TI__Guru 53095 points

    Have they looked at the STL_OSCILLATOR_TEST? It provides an option to test the clock using the HRPWM calibration function (SFO) and an option to test the clock using CPU Timer 2. CPU Timer 2 can be configured to run off a separate oscillator from SYSCLK (e.g. SYSCLK uses external osc, Timer 2 uses INTOSC2), so you can use it to independently measure elapsed time during a SYSCLK-based delay loop or interrupt.

    DCC is our recommended method to test the clocks on newer devices. You can set up the counters for INTOSC1 and INTOSC2 as well as several other clock source options.

    Whitney