ADS8698EVM-PDK: Programming the ADS8698EVM-PDK

Hi Tim,

I Apologized for late response because of business travelling. Please follow up these steps(Manual mode as an example):

1. The first important thing is you need connect the digital signals between your controller board and ADS8689EVM, /CS,SCLK,SDO and SDI

2. Your controller sends SCLK and SDI with command(table 6 in datasheet) including channel information to ADC according to below timings (Configure your SPI:

CPOL = 0, CPHA = 1).

3. You can retrieve the conversion data on SDO.

Remark: If you want to use different input ranges and other features, you will have to program the registers (refer to table 7 and 9)

Thanks&regards

Dale

Can you show me a example for code. I want to read out the channel 0.

My frist steps are like below.

void setup()
{

/*SPI*/
SPI.begin(); // initialize SPI bus
SPI.beginTransaction(SPISettings(500000, MSBFIRST, SPI_MODE1));

pinMode(pinSS, OUTPUT);
}

void loop()
{

//18 bit result
byte result1;
byte result2;
byte result3;

//starting measurement
digitalWrite(pinSS, LOW); //begin trans
SPI.transfer(0xC0); // select Channel 0
digitalWrite(pinSS, HIGH); //end trans

digitalWrite(SS, LOW); //begin trans

result1 = SPI.transfer(0);
result2 = SPI.transfer(0);
result3 = SPI.transfer(0);

digitalWrite(SS, HIGH); //end trans

}

I have a foto of the hardware setup.

Hi Tim,

I'll be covering for Dale while he is on travel.

Unfortunately we do not have sample code for the device.  

If you can provide a scope shot of the digital communications, SCLK, SDI,SDO, CS we can double check your timing, this is a common source for communications issues. 

Note when the device is powered up, all its registers are in their default mode. I would suggest trying to read and write to the device registers to check your timing. If in manual mode, as Dale covered,  you will need to select a channel to measure. I would suggest looking at Table 9 of the datasheet to become more familiar with the registers of the device. 

May I ask why you did not find the datasheet or EVM useguide useful?  We aim for our documents to cover necessary aspects of our products and be helpful for customers.

Regards

Cynthia