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LTC4312 Production
The LTC4312 is a hot-swappable 2-channel 2-wire bus multiplexer that allows one upstream bus to connect to any combination of downstream busses or channels...
Datasheet
LTC4312 on Analog.com

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LTC4312 Dual Master configuration

		
	
				

			

									
					    Abishek
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Dec 18, 2024 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  LTC4312  
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi Team,
    

    We are planning to use LTC4312 IC to switch a I2C slave device between two masters similar to the application diagram shown in the datasheet
    

     
    

    In the application circuit with dual master configuration, the power pin VCC2 is grounded
    

    Please let me know when we make VCC2 Power pin to ground, the I2COUT1 and I2COUT2 will work. As per the application circuit it shows like the VCC2 powers the OUT Signals
    

    And if VCC2 to be connected to ground, should we ground it using a capacitor or can be directly connected to ground
    

    Thanks and Regards
    

    Abishek V
    
			
    
			
									
		                             
                        

    
    
                                            
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                 LTC4312
                
                                        
                                            
                
                
                                
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Dec 18, 2024 8:45 PM
            
            
						
			            		
      
		
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      The VCC2 pin only powers the output side rise time accelerator (RTA) which is a pull-up current source that enables a faster rise time of the I2C bus signals than would otherwise be achieved via the bus pull-up resistor. 
      

      If your application is not using the output side RTA, then you can connect VCC2 directly to GND (not through a capacitor) and the RTA current sources on that side will be disabled regardless of the state of the nACC pin.  The input side RTA's are enabled by pulling nACC to GND (or leaving it open).  The input & output RTAs are disabled by pulling nACC to VCC1. 
      

      Note that the VCC1 pin powers all of the LTC4311's functions except for the output side RTAs.  Thus, the drivers on the output side are fully operational as long as VCC1 is present.
      


      Eric
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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