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TMS320F280025C: CMPSS Not triggering

Orlando Sbalqueiro eto
Prodigy 60 points
Part Number: TMS320F280025C
Other Parts Discussed in Thread: BOOSTXL-DRV8323RH, LAUNCHXL-F280025C

Dear TI Support,

I need help with CMPSS.

I am using:  LAUNCHXL-F280025C    -    BOOSTXL-DRV8323RH   - Universal Motor control Lab   ( so all original from TI)

Basically, I am trying to validate the CMPSS and Overcurrent protection and it is not working.

I am trying to set to trip to 10A, 7 A, 4 A and driving with 10A to force tripping and nothing happens. Can you help me? 

Look the settings below.

Thanks,

Orlando

1 - Hal.h

#define MTR1_IU_CMPHP_MUX 1 // CMPSS1-A11
#define MTR1_IU_CMPLP_MUX 1 // CMPSS1-A11

#define MTR1_IV_CMPHP_MUX 4 // CMPSS3-C4
#define MTR1_IV_CMPLP_MUX 4 // CMPSS3-C4

#define MTR1_IW_CMPHP_MUX 3 // CMPSS1-C7
#define MTR1_IW_CMPLP_MUX 3 // CMPSS1-C7

#define MTR1_CMPSS_DACH_VALUE 2700 // 3308 = 14A / 2917 = 10A / 2700 = 7A / 4095 = 23.56A
#define MTR1_CMPSS_DACL_VALUE 1396  // 788 =-14A / 1179 =-10A / 1396 =-7A / 0001 =-23.56A

2 - Hal.c

CMPSS_configFilterHigh(obj->cmpssHandle[cnt], 4, 4, 3);
CMPSS_initFilterHigh(obj->cmpssHandle[cnt]);
CMPSS_configFilterLow(obj->cmpssHandle[cnt], 4, 4, 3); 3
CMPSS_initFilterLow(obj->cmpssHandle[cnt]);

// Set up COMPHYSCTL register
// COMP hysteresis set to 2x typical value
CMPSS_setHysteresis(obj->cmpssHandle[cnt], 1);

  • 0
    TI__Guru** 114350 points
    Orlando Sbalqueiro eto said:
    #define MTR1_CMPSS_DACH_VALUE 2700 // 3308 = 14A / 2917 = 10A / 2700 = 7A / 4095 = 23.56A
    #define MTR1_CMPSS_DACL_VALUE 1396  // 788 =-14A / 1179 =-10A / 1396 =-7A / 0001 =-23.56A

    These setting are just for initilization. The DAC value for comparator will be updated by calling  HAL_setMtrCMPSSDACValue(obj->halMtrHandle, objSets->dacCMPValH, objSets->dacCMPValL) in runMotor1Control() in motor1_drive.c file.

    The dacCMPValH and dacCMPValL is setting in calcMotorOverCurrentThreshold() in motor_common.h(). So the maximum current is set/limited by the obj->overCurrent_A (motorVars_M1.overCurrent_A ).

    You can set the right limitation current by changing the definition value in user_mtr1.h. Or online change the value of the motorVars_M1.overCurrent_A in Expressions Window. 

    #define USER_MOTOR1_OVER_CURRENT_A         (7.0f)           // A

    Orlando Sbalqueiro eto said:
    2 - Hal.c

    Don't need to change anything at here in this hal.c file.

  • 0
    Prodigy 60 points

    Hello Yanming,

    I was able to validate it. Up to 9A works fine, but I had to add more filtering for 10A trip point works.

    Regards,

    Orlando