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The AD7792/AD7793 are low power, low noise, complete analog front ends for high precision measurement applications. The AD7792/AD7793 contain a low noise...
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Issue Reading Analog Values from AIN1 on AD7793 (ESP32-IDF)

		
	
				

			

									
					    ManoharCapuf
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 8, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Software
    
    		        		            		    
    Product Number:  AD7793  
    
    		        		        		        
    Software Version: ESPIDF
    
    		    		    
    
		    		    
		    			
    
			    
    Hello,
    

    I am working with the AD7793 ADC on the ESP32-IDF platform using SPI communication. I have successfully configured SPI and verified communication by reading the ID Register (0x04) and the AVDD monitor channel, both of which return correct values.
    

    However, when I try to read analog values from AIN1 (AIN1+/AIN1-), I am getting garbage values instead of expected ADC conversions. Here’s what I have done:
    

    What Works:
    

    White check mark ID Register (0x04) returns expected value (0xB masked with 0xF).
    White check mark AVDD monitor mode (AD7793_CH_AVDD_MONITOR) gives correct values (~3.3V).
    

    Issue:
    

    X Reading from AIN1 (AD7793_CH_AIN1P_AIN1M) returns garbage values.
    

    Steps I Have Taken:
    

    1️⃣ Reset AD7793 before configuration.
    2️⃣ Set AIN1 channel using AD7793_SetChannel(AD7793_CH_AIN1P_AIN1M).
    3️⃣ Set Gain = 1 using AD7793_SetGain(AD7793_GAIN_1).
    4️⃣ Enable internal 1.17V reference using AD7793_SetIntReference(AD7793_REFSEL_INT).
    5️⃣ Wait for RDY bit to go low before reading.
    6️⃣ Use AD7793_SingleConversion() to get the ADC result.
    

    Despite following these steps, I am getting incorrect/random values when reading from AIN1.
    Could you please help me debug this issue? If possible, could you provide any reference code or examples for correctly reading analog inputs on the AD7793 with SPI?
    

    Thank you for your support!
    
			
    
			
									
		                             
                        

    
    
                                            
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                 Multiplexed A/D Converters
                
                                                    
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                 ad7793
                
                                                    
                 Precision A/D Converters