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LTC6811-2 Production
The LTC6811 is a multicell battery stack monitor that measures up to 12 series connected battery cells with a total measurement error of less than 1.2mV...
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LTC6811-2 on Analog.com

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LTC6811-2 isoSPI addressable bus configuration



		

			

									
					    Dimitrisgeorgako
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 2, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC6811HG-2 #3ZZTRPBF 
    
    		        		    		    	
			
    Hello everyone!
    

    I recently purchased the LTC6811HG-2 part, that is going to be used in automotive HV battery and I am starting to work on my schematic for the master and slave boards. Concerning the iso SPI bus, i have seen from the datasheet and your own development board schematics many different solutions, as to ESD protection and isoSPI addressable bus coupling. For an automotive solution, where the environment of the isoSPI differential bus is extreme noisy, what hardware suggestion do you recommend?    Also, i would like to know how these solutions (as shown below) actually affect the signal integrity and signal power?
    

     
    

     
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Sep 16, 2022 1:18 PM
            
            
					
      
	
      

		
		
      
					
      The recommended circuit in the datasheet for LTC6811 is correct. The one below is the recommended circuit for isoSPI translator LTC6820. 
      

      We usually recommend transformers for isolation but if the environment is very noise you can also add common mode chokes along with transformer as shown in the schematic. 
      

      Signal integrity will not be affected. In both the modes you will be able to communicate with every device in daisy chain. there is no limit to it. 
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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