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ADUM4150 Production
The ADuM4150 is a 6-channel, SPIsolator™ digital isolator optimized for isolated serial peripheral interfaces (SPIs). Based on the Analog Devices, Inc...
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ADUM4150 on Analog.com

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ADuM4150: Inconsistency in the clock and SDI outputs

		            
		

			

									
					    NanjundaMS
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 3, 2019 
				
			
			
		
    
		
     
				
		
    
		    		    
		    
		    	
			
    Hi,
    

    

    I'm using ADuM4150  device for SPI communication on my multi-board unit.
    

    The power supply are both 3.3V supplies. The SPI is running at 10MHz.
    

    I'm observing a issue as some times the Isolator is providing proper clock output and some cycles of clock its not giving properly.
    

    Also the data is not at all coming up(even though there is a pulse at the beginning of the data (mosi).
    

    Can anyone please help me debug this issue.
    

    I'm not understanding the cause for this behaviour.
    

    

    Thanks & Regards,
    

    Nanjunda M
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 SPI Isolators
                
                                                    
                 Digital Isolation Technology
                
                                                    
                 ADuM4150
                
                                
            
    
    
    

		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Jul 11, 2019 10:58 AM
            
                                    
					
      
	
      

		
		
      
					
      Hi Nanjunda, 
      

      Can I understand that multi-board means there are several ADuM4150 devices sharing the same master side bus?
      

      Which clock output are you have difficulties, DCLK or SCLK?
      

      Scope shoots may be useful if possible! 
      

      Thanks,
      

      Jason
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jul 12, 2019 12:41 AM
            
                                    
												
						in reply to jnaso
					
									
        
	
        

		
		
        
					
        jnaso said:
        multi-board means
        

        Hi Jason,
        

        

        Multi-board means I have SPI master in one Board and its connected to the one more board which is having the slave device.
        

        The ADUM4150 is present on the slave board. And we did not have any issue with the clocks, we had only issue with MOSI.
        

        

        But the issue is resolved now. The issue was the signal levels were 1.8V instead of 3.3V (the FPGA(master) SPIs were not programmed with 3.3V instead were programmed with 1.8V).
        

        

        Thanks for the late support.
        

        

        Regards,
        

        Nanjunda M
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
						
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
						
                            
            
            				
            
                on Jul 12, 2019 12:41 AM
            
                                    
												
						in reply to jnaso
					
									
          
	
          

		
		
          
					
          jnaso said:
          multi-board means
          

          Hi Jason,
          

          

          Multi-board means I have SPI master in one Board and its connected to the one more board which is having the slave device.
          

          The ADUM4150 is present on the slave board. And we did not have any issue with the clocks, we had only issue with MOSI.
          

          

          But the issue is resolved now. The issue was the signal levels were 1.8V instead of 3.3V (the FPGA(master) SPIs were not programmed with 3.3V instead were programmed with 1.8V).
          

          

          Thanks for the late support.
          

          

          Regards,
          

          Nanjunda M
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
						
						
				
				
		
		
          
			
		
          
	
          

          

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