ADS8568: Data not received. Parallel interface mode & hardware mode selected

Do not mount components: R104, R105, R108, R109, R110. Processor used is DsPIC 33.

Hi Dale,

As per your request,I'm attaching the screenshots of CRO with required waveforms.Since we could not probe all the 4 signals at one time, we have parted it into two parts. In first image, we have captured CONVST, CS_BAR and RD_BAR. In Second image,we have captured CONVST, BUSY and RD_BAR 

Also attaching the schematic of ADC in PDF and the snippet of the code which is used for sampilng the data (Its an FSM based model)

void ADC_conv(void)
{
	j=0;
	while(j<5)
	{	
		switch(ADC_ST)
		{
			case(ADC_init):	
				ADC_RST = 1;
                delayus(1);
                ADC_RST = 0;
                ADC_CS_ = 1;
                ADC_RD_ = 1;
				ADC_CONVST = 0;		// set CONVST, command ADC to start conversion
				j++;
				ADC_ST = ADC_convst;
				break;
				
			case(ADC_convst):				
				ADC_CONVST = 1;		// set CONVST, command ADC to start conversion
                delayus(2);
                while(ADC_BUSY == 1);	// wait till busy is high
                if(ADC_BUSY == 0){
                    ADC_CONVST = 0;         // Remove conversion signal
                    j++;
                    ADC_ST = ADC_FS;
                    break;
                }
			case (ADC_FS):
				ADC_CS_ = 0;    		//chip select
				j++;
                delayus(2);
                ADC_RD_=0;
                delayus(1);
				ADC_ST = ADC_sampledata;
				break;
							
			case(ADC_sampledata):

                    ADC_RD_ = 0;
                    AI[1] = ADC_DATA;

				j++;
				ADC_ST = ADC_complete;
				break;
								
			case(ADC_complete):
//				  		//de-sync frame (chip select)
				j++;
				ADC_ST = ADC_init;
				break;
		}
	}	
}

ADC_SCHEME.pdf

Hi Bhavin,

I will look into the detail and get back to you soon, thanks.

Regards,

Dale

Hi Bhavin,

Your BUSY is correct which means the ADC conversion is working. I will send you an example code for ADS8568 offline.

Can you please confirm pin 11 is actually connected to DGND or +3.3V? can you confirm if your 53,60 Pins are connected to AGND on pcb?  Also check the voltage on REFIO pin. Looks like you are sending one /RD with a /CS to ADC, but I'm not sure what happened on /CS from high to low, I would suggest you to add a delay between /CS and /RD signal, also a delay(tCSCV) between /RD&/CS and next CONVST rising edge. A whole frame timing like the Figure 2 in datasheet will be very helpful to address the issue. Thanks.

I apologized for late feedback.

Regards,

Dale

Hi Dale,
Our problem is resolved. The Error was in the initiation of the micro-controller port on which we are reading the ADC's paralled data.
Your code helped us a lot in making our code more perfect and robust. Thank you so much for your support.

Hi Bhavin,

Thank you for update, please let me know if you need any further support.

Regards,

Dale