DAC8568: Use the external reference with Arduino

Hi Romain,

Sanjay will be able to look at this tomorrow. 

Best,

Katlynne Jones 

Hi Romain,

Please try this register write with your arduino to disable the internal reference.

reference section details in data-sheet : DAC8568 (page - 44 and 45)

Thanks,

Sanjay

Hello,

I tested your proposal but that not working.

Below the arduino code to show what I did for setting: 

void setup()
{

    pinMode (SyncDAC8568, OUTPUT); // Signal Sync pour le DA8568
    SPI.setDataMode(SPI_MODE1);
    SPI.begin();
   delay(100);
   digitalWrite(SyncDAC8568,LOW);delay(10);
   DAC8568Write(0b0000, 0b1000,0b0000, 0b0000,0b0000); 

}

void DAC8568Write(unsigned int prefix, unsigned int control, unsigned int address, unsigned int data, unsigned int feature)
{
    unsigned int one;
    unsigned int two;
    unsigned int three;
    unsigned int four;
    // send in the address and value via SPI:
    one = (prefix << 4)|control;
    two = (address << 4)|(data >>12);
    three = data >> 4;
    four = (data << 4)|feature;
    digitalWrite(SyncDAC8568,LOW);
    SPI.transfer(one);
    SPI.transfer(two);
    SPI.transfer(three);
    SPI.transfer(four);
    digitalWrite(SyncDAC8568,HIGH);
}

I confirm that on the pin 8 of the DAC8568 I have 3V and I supply the component on the pin AVDD pin3 a voltage of +5V.

On the output, I have a volotage between 0V to 5V.

Thankn you 

Best Regard