Products In This Thread

ADIN1100 Recommended for New Designs
The ADIN1100 is a low power, single port, 10BASE-T1L transceiver designed for industrial Ethernet applications and is compliant with the IEEE® 802.3cg...
Datasheet
ADIN1100 on Analog.com

ADIN1110 Recommended for New Designs
The ADIN1110 is an ultra low power, single port, 10BASE-T1L transceiver design for industrial Ethernet applications and is compliant with the IEEE® 802...
Datasheet
ADIN1110 on Analog.com

LTC9111 Recommended for New Designs
The LTC9111 is an IEEE 802.3cg compliant Single-Pair Power over Ethernet (SPoE) Powered Device (PD) controller. A wide 2.3V to 60V operating range capability...
Datasheet
LTC9111 on Analog.com

ADIN1200 Recommended for New Designs
The ADIN1200 is a low power, single-port, 10 Mbps and 100 Mbps Ethernet transceiver with low latency specifications designed for industrial Ethernet applications...
Datasheet
ADIN1200 on Analog.com

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ADIN1100 Media Converter without Controller



		

			

									
					    DerJan
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jul 6, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		        		    		    	
			
    Hello,
    

    I have been using the EVAL-SPoE-KIT-AZ to test media conversion with SPoE.
    

    I noticed on the LTC9111 Board there is an MCU installed. The circuit diagram says it's "Eval Purpose Components Only". However when I desoldered the MCU the media conversion no longer worked.
    

     
    

    Looking into the circuit and datasheet of the ADIN1100 there are strapping options for using the PHY as a media converter without an MCU. Regarding the ADIN1200 it doesn't look like it works without the MCU.
    Changing the resistors so it disables software power down mode gives me a feedback from the link LEDs but I cannot ping any device through the converter.
    

     
    

    Is there something I am missing or is it not possible to assemble a media converter without using an MCU?
    

    Thanks for your feedback.
    

    Greeting.
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                        
                on Jul 6, 2023 1:42 PM
            
            
					
      
	
      

		
		
      
					
      Hi DerJan,
      

      The behavior you see is expected. The ADIN1100 is 10BASE-T1L, 10Mbit/sec full duplex. To work correctly as media converter, the ADIN1200 must also operate in 10Mbit/sec full duplex, and auto-negotiation is the only reliable and correct way to achieve it.
      

      So yes, a microcontroller is required for writing a few registers via MDIO to configure the ADIN1200 for auto-negotiation advertising 10Mbit full duplex. This option is not available via ADIN1200 hardware configuration / pin strap. Such configuration is required as there is no buffer for data in PHY to PHY back-back connection in media converter.
      

      Regards,
      

      Shazia
      

      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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                on Jul 7, 2023 1:42 AM
            
            
												
						in reply to SMohammadi
					
									
        
	
        

		
		
        
					
        Hello Shazia,
        

        thanks for your answer.
        

        Looking through the hardware configuration pins of the ADIN1200 I found this table:
        

         
        

        If I get this right I can configure the ADIN1200 to operate in Auto Neg with 10 Mbps (Row Nr. 2). When taking a device and forcing it to be 10 Mbps Ethernet the signal the ADIN1200 receives should be 10 Mbps right?
        

        I thought this should solve the problem but it did not. What's the reason for that?
        

        Kind regards,
        

        Jan
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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        •  Analog Employees  
        
            
			                            
                        
                on Jul 10, 2023 7:30 AM
            
            
												
						in reply to DerJan
					
									
        
	
        

		
		
        
					
        Hi Jan,
        

        To your point, row No.2 will configure the ADIN1200 to operate in autonegotiation with 10Mbps/ 100Mbps, HD/FD. The option to pin strap the ADIN1200 for 10Mit FD autoneg disabled will require the other side of the link to be configured the same, autoneg disabled 10Mbit FD. The devices usually have autoneg enabled, and if the autonegotiation fails, acc. to IEEE802.3 standard, the port then defaults to 10Mbit half duplex, and that creates a problem of collisions on the link and loosing packets. If one side of a link is set to autoneg and the other is set to forced, than only a half duplex link can be brought up. 
        

        Regards,
        

        Shazia
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
				
						
						
				
				
		
		
        
			
		
        
	
        

        

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