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AD5755-1 SPI communication problem



		

			

									
						younjaeng
					
							

			
				
									
											
							 		
		        	            							
			
			    	
			                    
                
				                on Jan 24, 2018 
				
			
			
		


				
		

		    		    
		    
		    	
			
Hello,

 
I am trying to run AD5755-1 evaluation board using SPI communication via on-board J11 pin. 

 
I have a board supports SPI communication.

 
The board has SPI header (please check the attached image) but I don't know how to correctly connect SPI header and on-board J11 pin of AD5755-1 evaluation board.

 
As I know, 4-wire is needed for SPI communication, MOSI, MISO, SCK, and SS.

 
What pin of the on-board J11 should be connected to each wire? 

 
Also, I would appreciate it if you let me know the detail description for each pin of on-board J11 pin (DV_DD, DGND, SYNC, SCLK, SDIN, SDO, LDAC, etc.).

								


							

				
				
			

					
				
		

			
						
									
									
						
						
			
			
			
			
		


					

			





	

		
	











	

	

					



			


				
	









	
    
	

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                                 Analog Employees 
                                
                            
      • 
                        
     
                                                            			
			                            
                        
                on Jan 25, 2018 6:40 AM
            
            
					
    
	
    

		
		
    
					
    Hi younjaeng,
    
 
    Kindly see the following connections that you can make from your SPI board to J11 of the AD5755-1 board.
    
 
    SPI Board ---> J11
    
 
    GND--->DGND
    
 
    SS0--->SYNC
    
 
    SCK--->SCLK
    
 
    MOSI--->SDIN
    
 
    MISO--->SDO
    
 
    GPIOB0--->LDAC
    
 
    GPIOB1--->CLEAR
    
 
    GPIOB2--->POC
    
 
    GPIOB3--->RESETB
    
 
    GPIOB4--->FAULTB
    
 
    GPIOB5--->ALERT 
    
 
    For DVDD on J11, you can connect an external supply to provide power to this pin.
    
 
    Best regards,
    
 
    Rainier
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                on Jan 25, 2018 10:06 AM
            
            
					
    
	
    

		
		
    
					
    Hi rrosario,
    
 
    i think attached image shows pin1 corresponds to GPIOB1 and pin2 corresponds to GPIO0.
    
 
    If i connect SS0 to SYNC and GPIO5 to ALERT, it means pin5(=SS0, GPIO5) connects to SYNC and ALERT
    
 
    Is it right?
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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                                 Analog Employees 
                                
                            
      • 
                        
     
                                                            			
			                            
                        
                on Jan 25, 2018 12:16 PM
            
            
					
    
	
    

		
		
    
					
    Hi younjaeng,
    
 
    I didn't realize that you are limited with your digital lines and that it can only function either for SPI communication or a GPIO.
    
 
    Since this is the case, you should use:
    
 
    MOSI (pin1):SDIN
    
 
    SS0(pin5):SYNC
    
 
    MISO(pin3):SDO
    
 
    SCK(pin7):SCLK
    
 
    GPIOB0(pin2):LDAC
    
 
    GPIOB2(pin4):CLEAR
    
 
    GPIOB4(pin6):FAULTB
    
 
    GPIOB6(pin8):ALERT
    
 
    For the POC and RESETB, you can use just connect it to either a logic "0" or "1".
    
 
    For DVDD, you can connect an external supply to provide power to this pin.
    
 
    Best regards,
    
 
    Rainier
    
			
    

		
		
		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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