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The LTC2949 is a high precision current, voltage, temperature, charge and energy meter for electrical and hybrid vehicles and other isolated current sense...
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LTC2949 GPIO heart beat waveform



		

			

									
					    justifice
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 24, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		      		            		            		    
    Product Number:  LTC2949 
    
    		        		    		    	
			
    Hi,
    

    Should the heart beat waveform be square waveform?
    

    Below red line is the waveform we measured on GPIO5, the frequency is correct as 400kHz, but I'm not sure if the waveform is what should be expected.
    

     
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Battery Fuel Gauge and Coulomb Counter
                
                                                    
                 LTC2949
                
                                                    
                 battery management
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			








	
	
	
	



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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      The expected heartbeat waveform is 400kHz 12.5% duty cycle.  Although frequency and duty cycle look good here, I'm not sure why the waveform doesn't look like a square wave.  Can you check the probe compensation or length of wire used to get to the signal/GND?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      The expected heartbeat waveform is 400kHz 12.5% duty cycle.  Although frequency and duty cycle look good here, I'm not sure why the waveform doesn't look like a square wave.  Can you check the probe compensation or length of wire used to get to the signal/GND?
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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