ADS8698EVM-PDK: Issues to communicate withe the ADS8698EVM-PDK

Part Number: ADS8698EVM-PDK

Hello,

I have issues to communicate with the ADS8698EVM-PDK with an Arduino Uno over SPI.

The connections on the digital interdace I made are the following:

- DAISY, grounded trough J2;

- REFSEL, grounded trough J4;

- RST/PD, i didn' t "get" this signal from anywhere;

- AVDD, i provide 5V trough pin 2 of j32;

- DVDD, I provide 5V trough pin 2 of j33;

- A0+, I connected it to a 3.3V signal.

The voltages on AVDD, DVDD and REFIO are correct. The code I use is the following:

#include "SPI.h"
//ADS8698 pins
const int cs = 10;
//mosi = 11 (SDI)
//miso = 12 (SDO)
//sck = 13 (SCLK)
const int _RST = 9;

#include "SPI.h"
SPISettings ADS8698(8000000, MSBFIRST, SPI_MODE1);

void setup() {
pinMode (cs, OUTPUT);
pinMode (_RST, OUTPUT);
digitalWrite(_RST, HIGH);

delay(10);
Serial.begin(9600);
Serial.println("Test");
delay(1000);


//SPI.beginTransaction(ADS8698);
SPI.begin();
//ADS8698 starts with all channels enabled.
//ADS8698 starts with PGA's set to +/- 2.5*Vref. (LSB = 78,125 uV)
digitalWrite(cs, HIGH);
digitalWrite(cs, HIGH);
digitalWrite(cs, LOW);
SPI.transfer16(0x8500); // reset
digitalWrite(cs, HIGH);
digitalWrite(cs, HIGH);
digitalWrite(cs, LOW);
SPI.transfer16(0xA000); //auto mode
digitalWrite(cs, HIGH);    

}

void loop() {

for (byte i = 0; i < 4; ++i){
 
delay(10);
digitalWrite(cs, LOW);
SPI.transfer(0x00);
SPI.transfer(0x00);

byte MSB = SPI.transfer(0x00);
byte midSB = SPI.transfer(0x00);
byte LSB = SPI.transfer(0x00);
 
uint32_t result = (MSB << 16) | (midSB << 8) |LSB;
result = result >> 6;
         
digitalWrite(cs, HIGH);             
Serial.print("CH");
Serial.print(i);
Serial.print(": ");
//Serial.println(result);
Serial.print(MSB, HEX);
Serial.print(",");
Serial.print(midSB, HEX);
Serial.print(",");
Serial.print(LSB, HEX);
Serial.print(": ");
Serial.println(result);

delay(5000);
  }
}