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LTC2943 Production
The LTC2943 measures battery charge state, battery voltage, battery current and its own temperature in portable product applications. The wide input voltage...
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LTC2943 on Analog.com

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LTC2943 Stops monitoring Battery Voltage a Current



		

			

									
					    teranz
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 21, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi:
    

    I am using a LTC2943 in a small project, it is being monitored with a PIC16F18326 MPU.  Everything seemed fine then suddenly it stopped monitoring the battery voltage and current.  Strangely the Coulomb counter seems to keep working.  I created three breakout-boards with LTC2943 chips, they exhibit the same problem.  Is there some programming issue I`ve missed?
    

    

    Thanks, Tom
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 Battery Fuel Gauge and Coulomb Counter
                
                                                    
                 ltc2943
                
                                                    
                 battery management
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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        Hi Tom, 
        

        

        I wish someone replied to this.  I'm having similar problems.  I am getting an UVLO condition which could possibly be what is happening to you, but I'm not sure.  Without this condition my chips work fine and all the registers are reliable.  Check your load current and check bit 0 of the status register to make sure you aren't experiencing what I am.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
				
						
				
				
		
		
        
			
		
        
	
        

        

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        Please send email to bms.support@analog.com 
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
				
						
				
				
		
		
        
			
		
        
	
        

        

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						in reply to Fil
					
									
          
	
          

		
		
          
					
          Hi Fil,
          

          

          I will email you - for future readers that find this I think I did have a short step load pulling my input voltage low triggering UVLO..  Use a scope to make sure there aren't any high frequency steps at the chip input.
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
				
				
						
				
				
		
		
          
			
		
          
	
          

          

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						in reply to Fil
					
									
            
	
            

		
		
            
					
            Hi Fil,
            

            

            I will email you - for future readers that find this I think I did have a short step load pulling my input voltage low triggering UVLO..  Use a scope to make sure there aren't any high frequency steps at the chip input.
            
			
            

		
			
	      

		
		
	
            
	
            
		
            
			
		
            
	
            
	
            
		
						
				
				
						
				
				
		
		
            
			
		
            
	
            

            

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