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AD7405-1 no ack on second Byte..



		

			

									
					    ADLeo
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 26, 2012 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi All,
    
 
     
    
 
    I'm using a AD7415-1 (I2C interface) and the timing it at 5usec or 200KHz clock.
    
 
    After power up (aprox 1second) I'm not able to setup the AD7415-1 correctly.
    
 
     
    
 
    Following the datasheet information I'm starting by seting up the Configuration Register using the message type shown on Figure11 of the datasheet.
    
 
     
    
 
    I first Write the Serial Bus Address Byte(0xFA), followed by the Address Pointer Register (0x00) followed by the Cofiguration Register Address (0x42).
    
 
    Is the above setting correct? especially the second byte..
    
 
     
    
 
    The AD7415-1 acknoledges only the first byte (0xFA) but NOT the second one (0x00).. 
    
 
     
    
 
    Assuming the order 0xFA,0x00,0x42 is correct.. Am I missing something fundamental..?
    
 
     
    
 
    Any help would be much appreciated.
    
 
     
    
 
    Thanks
    
 
     
    
 
    Leoad
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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                on Mar 2, 2012 7:15 AM
            
            
					
        
	
        

		
		
        
					
        Hi FEB,
        
 
        Many thanks for the reply, yes you are wright..0xFA, 0x01, 0x42 are the correct values.
        
 
        P1=0 and P0=0 is for the Temperature Value Register (Read Only) and
        
 
        P1=0 and P0=1 is for the Configuration Register (read/Write)
        
 
        I mistyped it as I was trying the other configurations, but none of them seemed to work either.  For some reason only the fisrt byte is acknoledged.  I've attached a screenshot of the first 2 bytes.
        
 
        I've ordered another part to try but it'll be a while until I get chance to spend time on it unless its a quick fix.
        
 
        Many thanks
        
 
        Leoan
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Mar 2, 2012 7:15 AM
            
            
					
          
	
          

		
		
          
					
          Hi FEB,
          
 
          Many thanks for the reply, yes you are wright..0xFA, 0x01, 0x42 are the correct values.
          
 
          P1=0 and P0=0 is for the Temperature Value Register (Read Only) and
          
 
          P1=0 and P0=1 is for the Configuration Register (read/Write)
          
 
          I mistyped it as I was trying the other configurations, but none of them seemed to work either.  For some reason only the fisrt byte is acknoledged.  I've attached a screenshot of the first 2 bytes.
          
 
          I've ordered another part to try but it'll be a while until I get chance to spend time on it unless its a quick fix.
          
 
          Many thanks
          
 
          Leoan
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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