DRV8301 status register 0 always reads 0xFFFF

Hi Ed,

Is it possible to verify the issue on another board? This might give a clue if damage has occured or we have a setup problem.

Are you saying it works fine when you bread boarded but is no good on your custom PCB? Can you share a schematic?

Does the gate driver still function (input versus output)? Some simple first steps to check the functionaility of the IC is to measure the output voltage from the internal regulators (GVDD, AVDD, and DVDD).

There should be bypass capacitors for each of these regulators that are easier to probe onto.

Control Register 1 should return a non zero response.

Status Register 2 should also return a 1 in the device ID field.

Weird - all of a sudden, I'm getting an 0x0801 back from a status reg 2 read.. I wonder if I'm running the SPI bus at too high a speed?  My init code:

	retVal = USCI_A_SPI_masterInit(SPI_BASE,
	        USCI_A_SPI_CLOCKSOURCE_SMCLK,
	        UCS_getSMCLK(),
	        12500000 / 8,
	        USCI_A_SPI_MSB_FIRST,
	        //USCI_A_SPI_PHASE_DATA_CAPTURED_ONFIRST_CHANGED_ON_NEXT,		// Seems to work for LCD
	        USCI_A_SPI_PHASE_DATA_CHANGED_ONFIRST_CAPTURED_ON_NEXT,         // Works for DRV board
	        USCI_A_SPI_CLOCKPOLARITY_INACTIVITY_LOW
		);

..anything obviously wrong there?

*edit* if I read the SPI multiple times, repeating until the read is non-zero, THEN I see what appears to be completely valid data.  Weird but apparently functional.  I'd really like to know WHY this works, though.

Ed,

I would check the status of those regulations and can you send a scope capture of the SPI signals. It would be good to take a look at the commands you are sending.

Sharing the schematic may help debug as well.