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Digital Isolator for SPI Interface

		
	
				

			

									
					    SHARVY
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Apr 21, 2016 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
		    			
    
			    
    Hi,
    
 
    For our new project, we are planning to isolate the digital signal ( SPI Interface ) used in between a Micro controller & an ADC. Our isolation requirement is 1.5kV.
    
 
    Supply voltage will be 3.3V or 5V.
    
 
      
  
    1. Could you please suggest us the best Digital Isolator  part number from Analog Device, which is being used for the SPI Interface isolation. 
      2. 
  
    2. Also please let me know, whether you have any Digital Isolator which isolates both data & power
      3. 
 
    
 
    Best Regards
    
 
    Sharvy
    
			
    
			
									
		                             
                        
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Apr 25, 2016 1:42 PM
            
            
						
			            		
      
		
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      Hi Sharvy,
      
 
      A  nominal supply voltage of 3.3V or 5.0V will power all SPIsolator Digital Isolators. The ADuM3150/ADuM3151/ADuM3152/ADuM3153 SPIsolator devices will cover your isolation requirement. The ADuM3150 device will support a SPI clock rate up to 40MHz and has 2 independent low speed data channels. The ADuM3151/ADuM3152/ADuM3153 devices support SPI clock rates up to 17MHz and have 3 independent low speed data channels in different directional configurations.
      
 
      isoPower would be the product line for isolated power and data. The isoPower product selection guide is here:
      
 
      http://www.analog.com/en/products/interface-isolation/isolation/isopower.html
      
 
      There are isoPower devices with data channels included in the same package. They are available with 2 or 4 data channels in different forward/reverse  directional configurations. The isoPower devices are available for 150mW and 500mW isolated output power. What are the power and data channel counts needed? I can help narrow down the selection. 
      
 
      Thanks,
      
 
      Jason
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Apr 26, 2016 4:15 AM
            
            
						
			            		
        
		
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        Hi Jason,
        
 
        Thanks for the feedback.
        
 
        We are planning to use it for the SPI interface. Which has 3 output and one input ( MOSI,CS,CLK  & MISO from the host ).It will be powered from 5V DC supply. Maximum power requirement would be around 350mW.
        
 
        Kindly suggest us the best part number you have from the Isopower series.
        
 
        Best Regards
        
 
        Sharvy
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        •  Super User  
        
            
						
                            
            
            				
            
                on Apr 27, 2016 12:13 PM
            
            
						
			            		
        
		
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        Hi Sharvy,
        
 
        Alright, it sounds like there are no slave selects or additional low speed data channels in your application. You could consider an ADuM3150 for the SPI channels and an ADuM5000 for isolated dc/dc converter. The ADuM5000 will provide you a power budget up to 500mW.
        
 
        ADUM3150 Datasheet and Product Info | Analog Devices 
        
 
        ADUM5000 Datasheet and Product Info | Analog Devices 
        
 
        If you would like to set up the SPI channels on your own, the ADuM5401 will provide 500mW isolated power to slave side. The ADuM5401 has 3 forward data channels and 1 reverse data channel built in.  
        
 
        ADUM5401 Datasheet and Product Info | Analog Devices 
        
 
        Thanks,
        
 
        Jason
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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