TMS320F280049C: CMPSS configuration error

Shaoxing Ke

Part Number: TMS320F280049C

Hi Experts,

I am doing the OC protection, when I want to setup the current protection. And I use the CMPSS3_L to implement the one-shot PWM protection.

So the below code is my CMPSS configure, I also check the register about the CMPSS3, you can see the COMPLSTS.

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    CMPSS_enableModule(PUSH_PULL_OCP_CMPSS_BASE); //COMPDACE
    CMPSS_configLowComparator(PUSH_PULL_OCP_CMPSS_BASE,CMPSS_INSRC_DAC);//
    // Select positive input of CMPSSL to come from B2/C6/PGA3_OF (ILV_FB)
    ASysCtl_selectCMPLPMux(PUSH_PULL_OCP_CMPSS_ASYSCTRL_CMPLPMUX,
                           PSFB_PCMC_OCP_CMPSS_ASYSCTRL_MUX_VALUE); //
//  VDDA--
    CMPSS_configDAC(PUSH_PULL_OCP_CMPSS_BASE, CMPSS_DACVAL_SYSCLK |
                    CMPSS_DACREF_VDDA | CMPSS_DACSRC_SHDW); //
    CMPSS_setDACValueLow(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_DAC_INIT); //OC-DACLVALS-3584
//    CMPSS_setDACValueHigh(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_DAC_INIT);
    CMPSS_configFilterLow(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_SAMPLE_PRESCALE,
                          PSFB_OCP_SAMPLE_WINDOW, PUSH_PULL_OCP_THRESHOLD);
    //
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

    CMPSS_enableModule(PUSH_PULL_OCP_CMPSS_BASE); //COMPDACE

    CMPSS_configLowComparator(PUSH_PULL_OCP_CMPSS_BASE,CMPSS_INSRC_DAC);//


    // Select positive input of CMPSSL to come from B2/C6/PGA3_OF (ILV_FB)
    ASysCtl_selectCMPLPMux(PUSH_PULL_OCP_CMPSS_ASYSCTRL_CMPLPMUX,
                           PSFB_PCMC_OCP_CMPSS_ASYSCTRL_MUX_VALUE); //

//  VDDA--
    CMPSS_configDAC(PUSH_PULL_OCP_CMPSS_BASE, CMPSS_DACVAL_SYSCLK |
                    CMPSS_DACREF_VDDA | CMPSS_DACSRC_SHDW); //


    CMPSS_setDACValueLow(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_DAC_INIT); //OC-DACLVALS-3584


//    CMPSS_setDACValueHigh(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_DAC_INIT);
    CMPSS_configFilterLow(PUSH_PULL_OCP_CMPSS_BASE, PSFB_OCP_SAMPLE_PRESCALE,
                          PSFB_OCP_SAMPLE_WINDOW, PUSH_PULL_OCP_THRESHOLD);
    //
    // Initialize digital filter
    //

    CMPSS_initFilterLow(PUSH_PULL_OCP_CMPSS_BASE);

    //from B2/C6/PGA3_OF (ILV_FB)
    CMPSS_configOutputsLow(PUSH_PULL_OCP_CMPSS_BASE,
                           CMPSS_TRIP_FILTER | CMPSS_TRIPOUT_FILTER); //Use CMPSS-2 L- DACL for OCP

    CMPSS_clearFilterLatchLow(PUSH_PULL_OCP_CMPSS_BASE);

The register about the CMPSS3 as below:

could you help me out from the CMPSS configuration?

over 3 years ago

0 Marlyn Rosales Castaneda20 over 3 years ago

TI__Mastermind 23330 points

Hi Shaoxing,

What is the error that you are seeing from the comparator?

Best Regards,

Marlyn

0 Shaoxing Ke over 3 years ago in reply to Marlyn Rosales Castaneda20

TI__Expert 3590 points

Hi Marlyn,

Maybe I found that the DAC value is setup too less, so that the protection no work. But one question is that I did not configure the register on the high side of CMPSS3_H, why does COMPSTS have a value?

0 Marlyn Rosales Castaneda20 over 3 years ago in reply to Shaoxing Ke

TI__Mastermind 23330 points

Hi Shaoxing,

Shaoxing Ke said:
why does COMPSTS have a value?

In order to help figure this out, what is the output of your comparator? Is it what you are expecting?

Best Regards,

Marlyn

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TMS320F280049C: CMPSS configuration error