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ADM708 Production
The ADM705 / ADM706 / ADM707 / ADM708 microprocessor supervisory circuits are suitable for monitoring 5 V power supplies/batteries and microprocessor activity...
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ADM708 on Analog.com

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ADM708 LTSpice model doesn't work

		
	
				

			

									
					    Pascal06
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 21, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  ADM708  

    		        		    		    

		    		    
		    			

			    
Hello I would want to simulate a circuit based on ADM708 in LTSpice.


My first attempt was to use the furnished example circuit.


But it seems that the model doesn't work as expected.


The example circuit is (note the useless R1 and WDO net !)


 


Resulting simulation gives


 


But it should gives (if I'm not wrong !)


 


Could somebody help me ?


Thanks a lot in advance,


Pascal

			

			
									
		                                 
Thread Notes  

                

        
                                        
                        

    

                                            
                 hardware
                
                                                    
                 Supervisory Circuits
                
                                                    
                 Single-Supply Monitors
                
                                                    
                 LTspice (x64): 24.0.9
                
                                                    
                 adm708
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 23, 2024 11:02 PM
            
            
						
			            		
    
		
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    Hi  ,
    

    I checked the example circuit and sure enough it shows the same as yours, I'll take a deep dive on this issue and if this was proven as a model error, we need to communicate with the Apps Engineer in charge of this model to file a ticket to fix this model.
    

    Best Regards,
    

    Earl
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 24, 2024 12:19 AM
            
            
						
			            		
    
		
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    Hi  ,
    

    The voltage threshold for this part is 4.4V. Only upon reaching that threshold, it will start counting the reset timeout period of 200ms before the Vreset de-asserts.
    What you are seeing right now, the VCC only reaches until 4.5V before it ramps down so the time to de-assert the Vreset to 4.5V is not enough. 
    Try to increase the VCC to 5V and remain on that value, with that you could see that the Vreset will de-assert. Or instead of immediately ramping down from 4.5V, put enough time to stabilize the VCC before you ramp it down.
    

     
    

    Regards,
    Bianca
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
						
						
				
				
		
		
    
			
		
    
	
    

    

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