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ADAU1442 Production
The ADAU1442 / ADAU1445 / ADAU1446 are enhanced audio processors that allow full flexibility in routing all input and output signals. The SigmaDSP® core...
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ADAU1442 on Analog.com

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USB communication errors with ADAU1442



		

			

									
					    ian
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 26, 2010 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I am having problems with USB communications errors with the ADAU1442. The first download works correctly, subsequent downloads occasionally work but more often than not fail. Occasionally a download appears ok but is corrupt in some way.
    
 
    I have the SCK and SDA pins pulled high with 2k2 resistors to 3V3. The only other device on the I2C bus is the self boot memory. All traces are gaurded and signal integrity looks fine.
    
 
    Suggestions please?
    
 
    Cheers
    
 
    Ian.
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Audio Signal Processors
                
                                                    
                 adau1442
                
                                                    
                 SigmaDSP Audio Processors
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 2, 2010 9:29 PM
            
            
					
      
	
      

		
		
      
					
      I don't see anything on your schematics that would be obviously causing your communication issues. Is the ground on your board connected to your PC's ground? If there is a difference between these two grounds, you may see some problems when you have the USBi plugged in. If you have a laptop, you can test this by running your laptop off of battery power (not plugged in). 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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													0
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Sep 2, 2010 9:29 PM
            
            
					
      
	
      

		
		
      
					
      I don't see anything on your schematics that would be obviously causing your communication issues. Is the ground on your board connected to your PC's ground? If there is a difference between these two grounds, you may see some problems when you have the USBi plugged in. If you have a laptop, you can test this by running your laptop off of battery power (not plugged in). 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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