Products Mentioned

MAX17841B Production
The MAX17841B ASCI combines an SPI port with a universal asynchronous receiver transmitter (UART) specially designed to interface with Maxim battery management...
Datasheet
MAX17841B on Analog.com

MAX17852 Production
The MAX17852 is a flexible data-acquisition system for the management of high-voltage and low-voltage battery modules. The system can measure 14 cell voltages...
Datasheet
MAX17852 on Analog.com

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BMS review

		
	
				

			

									
					    sunghyun1
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jul 1, 2025 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  MAX17852  

    		        		    		    

		    		    
		    			

			    
   


I have a question.


 I designed a BMS board with MAX17841B+MAX17852. 


Do I need to use an isolator? It works fine.

			

			
									
		                             
                        

    

                                            
                 hardware
                
                                                    
                 UART-to-SPI Bridge
                
                                                    
                 Battery Status Monitors
                
                                                    
                 MAX17841B
                
                                                    
                 battery management
                
                                        
                                            
                
                
                                
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                on Feb 3, 2026 6:36 AM
            
            
						
			            		
    
		
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    Hi Sunghyun,
    

    It depends of the voltage between the chassis and the top cell: if >60V you need an isolator to avoid isolation break between MAX17841b and MAX17852.
    If <60V and negative pole of cells stack is linked to chassis, only add a fuse to avoid short-circuit in case the MAX17852 is failing short.

    I hope this hint helped a bit,
    BegR
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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