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Question for your AD5258 digi-POT

		
	
				

			

									
					    Kaos
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jan 8, 2013 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user encountered an issue with the AD5258 digi-POT where the output RAB was set to minimum on the B-side during power-up when SDA and SCL lines were pulled low by another device. The problem was not due to the AD5258 itself but was resolved by changing the connected atmospheric pressure sensor IC, which was suspected of pulling the I2C lines low. The engineer confirmed that the power-up sequence and I2C line states should be checked to ensure correct operation.
                        	    
    
                
                     AI Generated Content
                
    	    
    
             
				
        		
    
		    
		    		    
		    			
    
			    
    Dear Sir/Madam,
    
 
    I am just using your AD5258 digi-POT.
    So I found one trouble as following.
    Do you know why this trouble have happen?
    
 
    When the power supply to AD5258, the another device pull the SDA and SCL of AD5258 to LOW level. So AD5258 fix the output RAB to squeeze minumun to B-side. Why? When AD5258 wake up, SDA and SCL should fix to high level ,correct?
    Some AD5258s happen this trouble, but some AD5258s doesnt happen this trouble.
    
 
    I dont know the reason why.
    Please let me know the reason.
    
 
    Thanks, Kaos
    
			
    
			
									
		                             
                        

    
    
                                            
                 D/A Converters (DAC)
                
                                                    
                 data converters
                
                                                    
                 ad5258
                
                                                    
                 Digital Potentiometers (DigiPOT)
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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