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AD5941 Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
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AD5941 on Analog.com

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Measuring 6 cells of a battery pack with CN0510 by multiplexing

		
	
				

			

									
					    yigit1802
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 8, 2025 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  CN0510 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hello, I have an 6 series battery pack. I want to perform EIS test on each cell by multiplexing the AD5941. So for sense cables AC coupler - Buffer - Multiplexer looks like the correct way. I am confused about the force cables, should I mux those also? or may I do the excitation by the main terminals of the battery pack?
    

    When I tried the force cables on the mains and switching the sense cables of cells on CN0510 my measurement results gets worse. Is there a way to make this configuration work. I use sensorpal for the measurements right now but when i develop the card i will use custom software.
    
			
    
			
									
		                             
                        

    
    
                                            
                 EVAL-AD5941BATZ
                
                                                    
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                 cn0510
                
                                                    
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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Nov 12, 2025 12:39 AM
            
            
						
			            		
      
		
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      Hi,
      

        Excitation can be given at the main terminals alone.
      

        The AC potential across each battery is measured by ADC of AD5941.
      

        If this potential is very small or very big (outside allowed voltage input range of ADC), results will be erratic due to ADC saturation.
      

        You may adjust the gain of input potential
      

      - by opamp stages or bypassing them as shown in CN0510 schematic below:
      

       
      

      or by changing ADC PGA gain and RTIA values inside device via code.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Nov 17, 2025 1:18 AM
            
            
												
						in reply to Akila
					
										
			            		
        
		
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        Hello Akila,
        

        Thank you for your answer. There is an example measurement on one of the series of my battery pack. when I connect all the cables on the first series the result looks expected and it is consistent, but when I connect the F cables on the main terminals of the battery pack the results is as you see in the graph, it drifts from the reference measurement a lot. I have already checked that AIN2 and AIN3 (from the R17 and R20) signals are within +900mV -900mV. How can i make this result better? What should i modify on CN0510? What could be the reason of this deviation? (the example measurement is performed on cn0510 with the parameters of DC Bias: 1200mV, AC amplitude: 600mV, Frequency: 1Hz-1kHz, Points: 30)
        

        Thank you.
        

         
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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