Interfacing arduino with DAC MAX531

[Vlad.]

Hello guys, I am trying to interface arduino uno with SPI DAC from Maxim Integrated (MAX531). The cofiguration i use on this DAC is unipolar configuration. Based on how I understand the datasheet I write a code but doesn't work. If can someone help it will be great.

this is my code

// inslude the SPI library:
#include <SPI.h>

const int slaveSelectPin = 10;  // set pin 10 as the slave select
const int clrPin=9;          //set pin 9   for  clear DAC >> optional
int max_value=4095;             // max  value   for DAC
int min_value=0;                //min value dor DAC
int value;
int AByte = 0;
int command = 0b000000000000; // 0100  Load input and DAC registers from shift register; DAC output updated.
int data = 0b111111111111; //  desired DAC output.
int commandPlusData = command | data;
void setup() {
  Serial.begin(9600);
// set the slaveSelectPin as an output:
  pinMode (slaveSelectPin, OUTPUT); 
  digitalWrite (slaveSelectPin, HIGH);
  
  pinMode (clrPin,OUTPUT);
  digitalWrite (clrPin, HIGH);      // clear DAC
  // initialize SPI:
  SPI.begin(); 
  
}
void loop() {
 
 
  
  SPI.transfer (highByte (commandPlusData));
  SPI.transfer (lowByte (commandPlusData));
  digitalWrite (slaveSelectPin, HIGH);
   delay(80);
}

 

[Easyrider83]

Try this:
digitalWrite (slaveSelectPin, LOW);
SPI.transfer (highByte (commandPlusData));
SPI.transfer (lowByte (commandPlusData));
digitalWrite (slaveSelectPin, HIGH);
delay(80);

 

[Vlad.]

Hey, I try you're suggestion but doesnt work. can you verify if i am send the correct data to the DAC?