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TMS570LS1227: Is ADC Calibration required prior to running each Self Test?

Vimal N
Prodigy 80 points
Part Number: TMS570LS1227

Hi,

In SL_SelfTest_ADC() of the SAFETI Diagnostic library, to check the pin status ("testType" variable set to ADC_SELFTEST_ALL), prior to reading Vd, Vu and Vn (as specified in the reference manual SPNU515C), the following steps are carried out:

1. Self Test Reference Voltages ADREFHI and ADREFLO are read

2. SL_adcCalibration() is called to calibrate the ADC

Are the above steps required prior to each self-test? Or can they be carried out once on startup with the reference voltage values (ADREFHI and ADREFLO) read and stored for subsequent self-tests?

We plan to carry out periodic self-tests of the ADC channels. Would this cause an issue? If no, is there a minimum recommended interval for periodic execution of these self-tests?

Would appreciate your thoughts on the matter.

Thanks and Regards,

Vimal

  • 0
    TI__Guru 70211 points

    Hi Vimal,

    We started working on your thread and we will provide an update soon.

    --
    Thanks & regards,
    Jagadish.

  • +1 in reply to jagadish gundavarapu
    TI__Guru 70211 points

    Hi Vimal,

    Vimal N said:
    Are the above steps required prior to each self-test? Or can they be carried out once on startup with the reference voltage values (ADREFHI and ADREFLO) read and stored for subsequent self-tests?

    It would be better carried out these two steps each time. The failures can occur at any time so keep those steps for each time the tests carrying out.

    Vimal N said:
    We plan to carry out periodic self-tests of the ADC channels. Would this cause an issue? If no, is there a minimum recommended interval for periodic execution of these self-tests?

    I never did but there won't be any issue in carrying out periodic self-tests of ADC channels. The only thing needs to be considered is your actual ADC channels connected will get suspend until the testing completed.

    --

    Thanks & regards,
    Jagadish.

  • 0 in reply to jagadish gundavarapu
    Prodigy 80 points

    Hi Jagadish,

    Appreciate the clarification.

    Thanks and Regards,

    Vimal