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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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                on Sep 6, 2010 12:02 AM
            
            
					
        
	
        

		
		
        
					
        I wonder if you tried with selfboot pulled low - cos when you press reset, the dsp will set itself master and start loading data from the flash, during which you have two masters on the bus if they are both talking at the same time. The other thing I could think of is to disable all the input and output bclks/lrcks and see if the dsp can generate a sine tone by using the internal bclk/lrck.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Sep 6, 2010 12:02 AM
            
            
					
          
	
          

		
		
          
					
          I wonder if you tried with selfboot pulled low - cos when you press reset, the dsp will set itself master and start loading data from the flash, during which you have two masters on the bus if they are both talking at the same time. The other thing I could think of is to disable all the input and output bclks/lrcks and see if the dsp can generate a sine tone by using the internal bclk/lrck.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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