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ADPD188BI Recommended for New Designs
The ADPD188BI is a complete photometric system for smoke detection using optical dual wavelength technology. The module integrates a highly efficient photometric...
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ADPD188BI on Analog.com

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ADPD188BI - SPI communication

		
	
				

			

									
					    Paul154
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Oct 9, 2024 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is experiencing issues measuring MISO data during SPI communication with the ADPD188BI, despite correctly setting addresses 0x64 and 0x68. The final answer suggests checking the status of CS_Bar and SCLK, ensuring CS_Bar is held low long enough for the read to complete and that the register being read has a non-zero value.
                        	    
    
                
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    Category: Datasheet/Specs
    
    		        		            		    
    Product Number:  ADPD188BI  
    
    		        		    		    
    
		    		    
		    			
    
			    
    hello.
SPI communication test is in progress using ADPD188BI.

    

    The settings are in progress by receiving addresses 0x64, 0x68 
    through SPI communication by setting them as shown in data sheet P.42.

    

    However, the settings are fine, but MISO data cannot be measured.
    

    How should I proceed with the setup?
    

      
    
			
    
			
									
		                                 
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                 Datasheet/Specs
                
                                                    
                 Optical Sensing Technology
                
                                                    
                 Optical Mixed Signal Devices
                
                                                    
                 ADPD188BI
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      
            
						
                            
            
            				
            
                on Feb 6, 2025 10:40 AM
            
            
						
			            		
      
		
								
	
      

		
		
      
		
      
                                
                                                            
      
					
      Can you show the status of CS_Bar and SCLK?  The rising edge of SCLK will load each MISO bit and CS_Bar needs to be held low long enough for the read to complete.  Additionally the register being read would need to have a non-zero value for any bits to toggle on the MISO line.
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
				
				
						
				
				
		
		
      
			
		
      
	
      

      

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