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Question about Link Rate of LTC4331



		

			

									
						Kazu
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Oct 15, 2021 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hello


Is the I2C link rate limited by the SCL frequency?


I am thinking of setting the link rate to 500kHz or 1MHz with the SCL frequency = 400kHz.


Which link rate (500kHz or 1MHz) is better?


Regards,


Kazu

								


				
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	














	

	

					



			








	
	
	
	



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													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
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                                 Analog Employees 
                                
                            
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                on Oct 15, 2021 11:59 AM
            
            
					
    
	
    

		
		
    
					
    Hi Kazu, 
    

    Table 2 in the LTC4331 datasheet will be the guide to follow. A 400kHz SCL corresponds to the Fm I2C Class, which means a Speed Index of 5 or greater. 
    

    Let me edit this to add a detail... The clock width is reproduced by the LTC4331 pair. If Speed Index 8 is chosen (1MHz Link Rate), the SCL coming out will have the width of a Fm+ clock. It may be too narrow for the remote I2C devices to interpret at there probably isn't any advantage to do it. I'd recommend picking Speed Index 5-7. 
    

    Regards,
    

    Jason
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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													+1
							
			
				
									
							        
            
                                                                                                        
      
                            
    • 
                                 Analog Employees 
                                
                            
      • 
                        
     
                                                           			
			                            
                        
                on Oct 15, 2021 11:59 AM
            
            
					
    
	
    

		
		
    
					
    Hi Kazu, 
    

    Table 2 in the LTC4331 datasheet will be the guide to follow. A 400kHz SCL corresponds to the Fm I2C Class, which means a Speed Index of 5 or greater. 
    

    Let me edit this to add a detail... The clock width is reproduced by the LTC4331 pair. If Speed Index 8 is chosen (1MHz Link Rate), the SCL coming out will have the width of a Fm+ clock. It may be too narrow for the remote I2C devices to interpret at there probably isn't any advantage to do it. I'd recommend picking Speed Index 5-7. 
    

    Regards,
    

    Jason
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
				
						
						
				
				
		
		
    
			
		
    
	
    

    

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