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ADPD144RI Not Recommended for New Designs
The ADPD144RI is a highly integrated, photometric front end optimized for photoplethysmography (PPG) detection of blood oxygenation (SpO2) by synchronous...
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ADPD144RI on Analog.com

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ADPD144RI register configuration



		

			

									
					    pablov
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Sep 20, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADPD144RI 
    
    		        		    		    	
			
    We're using the ADPD144RI in a prototype pulse oximeter, in transmissive mode using external leds. We want to modify the led pulse width and pulse period, but the datasheet has no information on how to configure the registers, just recommended settings. Is there any in depth information on how to configure the registers? The datasheet is very incomplete in that regard.
     Thanks,
     Pablo Vacatello
     Jotatec SRL
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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                on Sep 21, 2022 8:57 AM
            
            
					
        
	
        

		
		
        
					
        To clarify, we can read and write to the registers correctly, and have the ADPD144RI working correctly. What we want to know is how the LEDMODE, bits 7:0 of NUMPULSES and AFEMODE should be configured to modify the LED and AFE pulse timing.
        
			
        

		
			
	      

		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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                on Nov 11, 2022 3:49 PM
            
            
					
          
	
          

		
		
          
					
          Hello Pablo, I helped interacting with you with ADI support and Nicholas Resnik. 
          

          I am posting here the path that he has advised Jotatec to follow and apparently this resulted in a solution:
          

          The ADPD144RI uses the ADPD103 as an AFE inside the part.
          In the ADPD103 datasheet you will find a section on digital integration. 
          This mode is not fully covered in the ADPD144RI datasheet for some reason. This mode allows the user to use wide pulse widths and sample segments of the pulse.
           
          www.analog.com/.../ADPD103.pdf
           
          The “normal-mode” operation uses an analog integrator. This integrator is only optimized for 2us and 3us LED pulses.
          

          The DIGITAL INTEGRATE MODE is described at page 30.
          

          
			
          

		
			
	      

		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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