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AD5270 Command Operation



		

			

									
					    AkiraO
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 21, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    Our customer has troubled command operation of AD5270. They send the commands by following order and setting.
    
 
       1) 0x2400
    
 
       2) 0x1000
    
 
       3) 0x1C02
    
 
       4) 0x0400
    
 
    After sending the commands, they checked the position of the digital rheostat wiper. The position was center.
    
 
    Are there any problems in the order and/or setting of the commands?
    
 
    And could you please advise me, why do we need an external pull-up resistor on SDO pin if it is not use?
    
 
    Best regards,
    
 
    Akira
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      
            
			                            
                        
                on Jan 5, 2017 1:27 AM
            
            
					
      
	
      

		
		
      
					
      Hi Akira-san,
      
 
      Using the evaluation board, I tried the 4 commands in the same sequence and the digipot does not change the wiper position. When I removed the software reset command, everything works perfectly.
      
 
      Looking at your scope shots, there should be no problem with this. How much delay did you add for the OK case?
      
 
      Regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Jan 5, 2017 1:27 AM
            
            
					
      
	
      

		
		
      
					
      Hi Akira-san,
      
 
      Using the evaluation board, I tried the 4 commands in the same sequence and the digipot does not change the wiper position. When I removed the software reset command, everything works perfectly.
      
 
      Looking at your scope shots, there should be no problem with this. How much delay did you add for the OK case?
      
 
      Regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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