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LTC4124 Recommended for New Designs
The LTC4124 is a simple high performance wireless Li-Ion charger with low battery disconnect. The pin-selectable charge current (up to 100mA) and charge...
Datasheet
LTC4124 on Analog.com

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Ltc4124 Ship mode



		

			

									
					    torr@me.com
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 25, 2019 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    I need to get the LTC4124 into ship mode using a DI/O pin from a MCU.  The circuit will be embedded and can not have external  a button.
    

    Is there a reference design that shows how this would be implemented?
    

    Or do you have a preferred design that you could share?
    

    

    Thank You
    
									
			        
		
    

				
						
        

    
    Tags: 
                                            
                 LTC4124
                
                                                    
                 Wireless Power Transfer
                
                                                    
                 battery management
                
                                
            
    
    
    

		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
			                            
                                                                                                                        
            
				
			
            
					
      
	
      

		
		
      
					
      Hi,
      

      The detailed information about ship mode can be found in page 11 and 12 of the datasheet. 
      

      A few key points to notice: 
      

      1. The part has to be in ideal diode more before it can enter ship mode. 
      

      2. For the part to enter ship mode, ACIN and DCIN has to be above 1.5V simultaneously.
      

      We do not have a reference design for entering ship mode from a digital I/O. If you want the part to enter ship mode when it is removed from the transmitter, you can simply put a diode between VCC and DCIN, with the anode side connecting to DCIN. In this way, the moment when LTC4124 is removed from the transmitter, the ACIN starts to drop and the part enters ideal diode mode, but ACIN is still higher than 1.5V, and DCIN is also higher than 1.5V with the help of the diode. As a result, the part will enter ship mode. 
      

      If you desire for the part to enter ship mode at a certain defined moment after it is removed from the transmitter, you will need to find a way to drive ACIN pin higher than 1.5V, while having a diode connecting from VCC to DCIN. Please note that you also need to isolate this ACIN driver circuit when the transmitter is charging the receiver resonant tank. 
      

      If you want to get LTC4124 into ship mode, how do you want to power your MCU? From the battery directly? 
      

      Thanks,
      

      Wenwei. 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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						in reply to Wenwei
					
									
        
	
        

		
		
        
					
        Hello,
        

        I would like to be able to use a MCU GPIO pin to activate the ship mode. As described in the datasheet, the ability to activate the ship mode so the product can be delivered with the battery charged/ready to use. The product could then be powered up by initiating the wireless charging. 
        

        So the BLE MCU could receive a Bluetooth command to put the product in "ship mode" eliminating the continuous battery discharge. Then the product could be woken by charging when user is ready to use.
        

        Thank you
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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						in reply to Wenwei
					
									
          
	
          

		
		
          
					
          I would like to use a BLE MCU GPIO pin to activate ship mode by sending a command via bluetooth. This would eliminate continuously discharging the battery until the user is ready for use. The product could then be woken by initiating wireless charging. 
          

          Thank you 
          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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