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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 Dec 27, 2016 5:52 AM
            
            
					
      
	
      

		
		
      
					
      Hi Akira-san,
      
 
      Apologies for the delay.
      
 
      My interpretation of the commands are the following:
      
 
      1. 0x2400 = device is removed from shutdown mode
      
 
      2. 0x1000 = software reset
      
 
      3. 0x1C02 = allow update of wiper position through digital interface
      
 
      4. 0x0400 = write zero-scale
      
 
      From these commands, the expected behavior of the digipot output is at zero scale. Could you try removing the software reset and check if the part is responding? If the part responds, could you check your timing in the SPI lines as you may be violating a specification there.
      
 
      Regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      
            
			                            
                        
                on Dec 27, 2016 5:52 AM
            
            
					
      
	
      

		
		
      
					
      Hi Akira-san,
      
 
      Apologies for the delay.
      
 
      My interpretation of the commands are the following:
      
 
      1. 0x2400 = device is removed from shutdown mode
      
 
      2. 0x1000 = software reset
      
 
      3. 0x1C02 = allow update of wiper position through digital interface
      
 
      4. 0x0400 = write zero-scale
      
 
      From these commands, the expected behavior of the digipot output is at zero scale. Could you try removing the software reset and check if the part is responding? If the part responds, could you check your timing in the SPI lines as you may be violating a specification there.
      
 
      Regards,
      
 
      Mark
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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