Products Mentioned

LTC2955 Recommended for New Designs
The LTC2955 is a micropower, pushbutton on/off controller that manages system power by generating a clean enable output from the supply monitor input and...
Datasheet
LTC2955 on Analog.com

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LTC2955 Question

		
	
				

			

									
					    TMundt273
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jan 27, 2021 
				
			
			
		

		
		                     
				
        		

		    
		    		    
		    			

			    
Does the INT pin go low when the pushbutton is pressed for OFF condition then goes high after the TMR runs out and at that time EN is disabled?


I am asking if the INT proceeds the EN shutdown to notify the device of a coming powerdown.




Thanks

			

			
									
		                             
                        

    

                                            
                 Power Monitor  Control  and Protection
                
                                                    
                 LTC2955
                
                                                    
                 Pushbutton Controllers
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    •  Super User  
    
            
						
                            
            
            				
            
                on Jan 28, 2021 1:53 PM
            
            
						
			            		
    
		
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    Yes, INT proceeds the EN pin turning off. 

     When the user holds PB# low for the 32ms debounce time, INT goes low, which signals to the µP that a shutdown is coming soon, and that it should take care of any housekeeping tasks. The µP can tell the LTC2955 it is ready by pulling its KILL# pin low, which will cause EN to be pulled low. This speeds up the turn-off process, but is not required: if the LTC2955 never gets a KILL# signal, EN will go low if the user holds PB# low for tDB(OFF)+tINT(OFF)+tTMR.
     
     See page 9 of the datasheet for more details.
     
     -Aaron
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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