BOOSTXL-DRV8305EVM: With LAUNCHXL-F28027F, nFAULT LED turns red but FAULT bit on LAUNCHXL-F28027F does not indicate this

Part Number: BOOSTXL-DRV8305EVM

Hi,

I have LaunchPad XL Tms320F28027F plus Boostxl-Drv8305.  Using it to run our motor.

The structure “DRV_SPI_8305_Vars_t  gDrvSpi8305Vars” is being monitored via the debugger watch window -- *.js script file

This gDrvSpi8305Vars structure is updated within the control loop and DRV8305_SPI is defined in hal.h :

            #ifdef DRV8305_SPI

                   HAL_writeDrvData(halHandle,&gDrvSpi8305Vars);

                   HAL_readDrvData(halHandle,&gDrvSpi8305Vars);

           #endif

What we see is that bits “VCPH_UVFL, VCPH under voltage protection warning” and “PVDD_OVFL, PVDD over voltage protection warning”  are always on, even before running the system.

But we never see the “FAULT” bit on.  The system dies before I get to see this “FAULT” bit on.  Below is the live captured data for this gDrvSpi8305Vars structure.

Any help as to why the FAULT bit is not on would be appreciated.

Thanks,

Asha