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CN0537 output data to ADC raw data



		

			

									
					    teli
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Nov 16, 2022 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Software
    
    		        		            		    
    Product Number:  CN0537 
    
    		        		    		    	
			
    Hello
    

    

    Below thread gave me the advice that CN0537 outputs PTR.
    

     RE: CN0537 output data 
    

    How can I change PTR to ADC raw data  ?
    

    I would like to know the equation of PTR to ADC raw data.
    

    I can not find the equation from below user guide.
    

    www.analog.com/.../cn0537.pdf
    

    Please let me know your advice.
    

    

    Regards,
    

    Teli
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	















    
	
    
	
    
					



			


				
	









	
      
	

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													+1
							
			
				
									
							        
			
			
			
      •  Analog Employees  
      
            
			                            
                        
                on Nov 16, 2022 4:25 PM
            
            
					
      
	
      

		
		
      
					
      Hi Teli,
      

      The relationship is detailed in the circuit note through several sections. This is the equation for PTR and the photodiode and LED currents:
      

       

      

      The photodiode current is computed from the raw ADC data (Code):
       
      where Q is the ADC resolution and PULSE_COUNT is the number of LED pulses for the timeslot (set in software)


      The LED current is set in software and is set using the course, fine, and scale control registers for each LED:
       
      

      Best Regards,
      

      Nikko
      
			
      

		
		
		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
						
						
				
				
		
		
      
			
		
      
	
      

      

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