Products Mentioned

ADM693 Production
The ADM690-ADM695 family of supervisory circuits offers complete single chip solutions for power supply monitoring and battery control functions in microprocessor...
Datasheet
ADM693 on Analog.com

Thread Details

  • State Verified Answer
  • Replies 11 replies
  • Subscribers 40 subscribers
  • Views 5690 views
  • Users 0 members are here 

        

            Post
             Go back to editing
        

    

    


    

    









		


















	
	
			
	
			
		
	
	
		

	    
	    
	    		
How does ADM693 shift the watchdog-timeout to?

		
	
				

			

									
					    Kaos
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 29, 2015 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user inquired about the watchdog timeout period for the ADM693 under varying VCC and temperature conditions. The support engineer provided bench test results for three samples, indicating that the timeout period varies with VCC and temperature. However, due to the age of the part, comprehensive design data and guaranteed specifications are unavailable. The engineer suggested using the ADM8693 for a well-defined watchdog timeout range.
                        	    
    
                
                     AI Generated Content
                
    	    
    
             
				
        		
    
		    
		    		    
		    			
    
			    
    Dear Sir/Madam,
    
 
    As for your ADM693, our customer asked the following question to us.
    
 
    I could not catch the answer on your datasheet.
    
 
    So please let me know your comment.
    
 
    The watchdog timeout period is showed min 1sec to max 2.25sec when VCC = 5V, TA = +25C.
    
 
    Q-1
    
 
    If VCC is shifted to 4.5V or 5.5V, then how should we think this value shifting?
    
 
    eg; when 4.5V, shift min 0.9sec to max 2.15sec ? Otherwise same value?
    
 
    Q-2
    
 
    If TA is shifted to 0 to 70C, then how should we thinkthis value shifting?
    
 
    eg; when around temp=0C, shift min 0.9sec to max 2.15sec ? Otherwise same value?
    
 
    Please let me know the trend when the above conditions.
    
 
    My expected reply as following chart if you have.
    
 
    Thanks Kaos
    
			
    
			
									
		                             
                        

    
    
                                            
                 Supervisory Circuits
                
                                                    
                 Single-Supply Monitors
                
                                                    
                 adm693
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                                                    
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



Parents
	
      
	

    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 1, 2015 4:45 AM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Kaos,
      
 
      This is an old part and the device characterization work done at the time isn't as comprehensive as nowadays.
      
 
      we don't have enough test data to guarantee this specification over VCC and temperature range.
      
 
      i would expect the timing specification limits to expand with wider temperature and VCC range, but i don't have data to quantify this.
      
 
      one thing may help is figure 12, where the reset time is plotted against the temperature, the reset time and watchdog time should be derived from the same internal oscillator, thus radiometric. thus the variation in watchdog time would follow similar curve.
      
 
      Ren
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

      • 

	
    



Reply

      


    • 
	
      



	
			
		
	



      
	
      
		
      
							
					
      
		
      
		    
		    		    
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Oct 1, 2015 4:45 AM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Hi Kaos,
      
 
      This is an old part and the device characterization work done at the time isn't as comprehensive as nowadays.
      
 
      we don't have enough test data to guarantee this specification over VCC and temperature range.
      
 
      i would expect the timing specification limits to expand with wider temperature and VCC range, but i don't have data to quantify this.
      
 
      one thing may help is figure 12, where the reset time is plotted against the temperature, the reset time and watchdog time should be derived from the same internal oscillator, thus radiometric. thus the variation in watchdog time would follow similar curve.
      
 
      Ren
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
				
				
				
		
		
      
			
		
      
	
      

      

      • 


    


Children
	
    No Data