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sigma delta fast overcurrent detection

ELISA SACCHI
Prodigy 150 points

Hi 

I need to know what is the reaction time of the sigma delta fast overcurrent detection in TMS320F2837xD Dual-Core Microcontroller. 

The reaction time is related to the latency of the filter calculate with the following formula:

So if our data are:

Sinc filetr = sinc3

OSR = 16 

Modulator rate = 20 MHz

Sinc Latency =  2.4 us => Is right?? Is this the reaction time for overcurrent detection?

It is possible to configure the comparator filter with this data and the data fileter unit with other oversampling rate (128)?

The microprocessor manual tell:

Higher threshold comparator events can be configured to trigger following events : CPU interrupt, CLA task, PWM trip.

It is possible to connect the comparator out to a digital IO without using a ISR or a CLA task?

  • 0
    TI__Guru 55700 points

    Sacchi,

    Sinc Latency =  2.4 us => Is right?? Is this the reaction time for overcurrent detection?

    Yes, max reaction time for over-current detection is indeed latency of Sinc filter.

    It is possible to configure the comparator filter with this data and the data fileter unit with other oversampling rate (128)?

    Yes, both comparator filter and Data filter can have independent OSR settings and filter type

    Comparator filter:

    OSR settings: SDCPARMx.COSR can be used to configure comparator filter OSR settings

    Filter Type    :SDCPARMx.CS1_CS0 can be used to configure comparator filter type

    Data filter:

    OSR settings: SDDFPARMx.DOSR can be used to configure data filter OSR settings

    Filter Type    :SDDFPARMx.SST can be used to configure data filter type

    It is possible to connect the comparator out to a digital IO without using a ISR or a CLA task?

    Yes, you can use Output XBAR to bringout comparator events (COMPL / COMPH) on GPIOs

    Regards,

    Manoj