WEBENCH® Tools/DAC161S997: Unable to update ERR-CONFIG Register

krishna saladi

Part Number: DAC161S997
Other Parts Discussed in Thread: MSP430F5659,

Tool/software: WEBENCH® Design Tools

Hi Team,

I'm using DAC161S997 evaluation board and interfaced SPI with MSP430F5659.

I'm able to set the DAC value like 15mA but DAC not maintaining the looped current 15mA continuously its getting down. If i send NOP command continuously i'm able to get the 15mA looped current.

But in my application its difficult to provide handshake continuously like sending NOP(<100ms) to keep alive because this i want to disable SPI timeout permanently to achieve 15mA looped current continuously

I'm trying to Configure the ERR-CONFIG Register to disable the SPI Timeout but it's not working. Please help me to get out of this issue

Please check below code for reference.

void Dac161s997TestSetup(void)
{
unsigned short errValue;

initializeUSCI_B1_DAC161(enSpiClock_1MHZ);

DAC161_Write_Regs (0xF1, DAC161_ERR_CONFIG_REG, 2); //spi timeout disabled

errValue = DAC161_CONVERT_ERR_VALUE(4000) & 0x7f00;

DAC161_Write_Regs (&errValue, DAC161_ERR_LOW_REG, 2);

errValue = DAC161_CONVERT_ERR_VALUE(20000) & 0xff00;

if (errValue < 0x80)
errValue = 0x80;

DAC161_Write_Regs (&errValue, DAC161_ERR_HIGH_REG, 2);

DelayInMs(10); //Dac161s997TestSetup

DAC161_Nop();

DelayInMs(10); //Dac161s997TestSetup

Dac161s997SetValue(15000);

while(1);

//while(1)

//{

// DAC161_Nop();

//}

}

Thanks,

Krishna

over 4 years ago

0 Akhilesh K over 4 years ago

TI__Mastermind 18816 points

Hi Saladi,

One of my team member will reply back to you soon.

Regards,

0 krishna saladi over 4 years ago in reply to Akhilesh K

Intellectual 450 points

Hi Ak,

Is there any update?

Thanks,

Krishna

0 Reza Abdullah over 4 years ago in reply to krishna saladi

TI__Intellectual 1570 points

Hello Krishna,

From your code, it looks like you attempt to mask both the SPI timeout and loop errors. However, by writing 0xF1 to the error config register, you also disable retry loop which prevents the chip from re-asserting the DAC code until the status register is read back. Can you write 0x71 to the error config register instead and retry your code?

Also, if you continue to have issues, can you check your SPI signals on an oscilloscope to confirm that the intended data is getting written to the error config register?

Thanks,

Reza

0 krishna saladi over 4 years ago in reply to Reza Abdullah

Intellectual 450 points

Hi Reza,

It's working now, Used same code added delay in between spi init and dac set registers.

Thanks,

Krishna

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WEBENCH® Tools/DAC161S997: Unable to update ERR-CONFIG Register