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AD7405-1 no ack on second Byte..



		

			

									
					    ADLeo
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Feb 25, 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