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Connecting 3 LEDs Red, Green IR to ADPD105



		

			

									
						subbu
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 29, 2021 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hi, 
    

    

    I am working on testing of EVAL-ADPD105. ADPD105 Supports connecting 3 LEDs through LEDX1, LEDX2, LEDX3. I want to connect Red, IR, Green LED to these pins. But based on the register configuration we can enable only 2 LEDs in a particular time slot based on register configuration in 0x14. 
    

    If We want to control the 3rd LED How can be do that. 
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

					
    
			
    


    

	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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                on Nov 30, 2021 6:55 PM
            
            
					
      
	
      

		
		
      
					
      Hi there,
      

      The ADPD105 operates two independent time slots, Time Slot A and Time Slot B, allowing two measurements. You can only enable one LED driver in either Time Slot A or Time Slot B by setting proper bit in register 0x14. Unfortunately the ADPD105 does not support a third time slot hence you have to connect at least two LEDs of different color to a single LED driver if your application allows.
      

      We encourage you to take a look at our latest photometric AFE ADPD4100 (https://www.analog.com/en/products/adpd4101.html). The ADPD4100 support up to 12 time slots and can enable up to 4 LED drivers during any time slot for fine control of the LED current.
      

      Regards,
      

      Glen B. 
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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