Products Mentioned

MAX33041E Production
The MAX33040E/MAX33041E are +3.3V control area network (CAN) transceivers with integrated protection for industrial applications. These devices have extended...
Datasheet
MAX33041E on Analog.com

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MAX33041E slow rate resistor

		
	
				

			

									
					    RayW0705
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Jun 5, 2024 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Hardware

    		        		            		    
Product Number:  MAX33041E  

    		        		    		    

		    		    
		    			

			    
 Hi ADI Expert,


I'm currently testing the MAX33041E for CAN-BUS package transmission, but it cannot pass the high-speed 1Mbps testing. So, I changed the external slew rate resistance from 39.2Kohm to 0, and it can pass the test. However, the low-speed test 10Kbps cannot pass. Could you please advise on how to define the slew rate resistance value? Please provide some suggestions. 


Best Regards.


Ray.

			

			
									
		                             
                        

    

                                            
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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jun 5, 2024 2:24 PM
            
            
						
			            		
    
		
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    Hi Ray,
    

    Just to clarify, you changed the external slew rate resistor from 39.2kΩ to 0Ω to get the 1Mbps test to pass, and kept this same value for the 10kbps test which is failing? Or did you switch back to 39.2kΩ for the 10kbps test?
    

    If it is the former, then I would suggest using 0Ω for the 1Mbps test and 39.2kΩ for the 10kbps test.
    

    The resistor value of 39.2kΩ is recommended as it will set the voltage on the STBY pin between 0.1V and 0.6V, putting the part into a slow slew rate mode. 
    

    Thanks,
    

    Eileen
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jun 6, 2024 3:17 AM
            
            
												
						in reply to ADIApproved
					
										
			            		
    
		
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    Hi Eileen,
    

    Yes, 0 ohm is passed 1Mbps testing and 39.2K for 10Kbps. thus I don't know how to design the resistor, Do you have detail information?　
    

    Best Regards.
    

    Ray. 
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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