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AD7998 Production
The AD7997 / AD7998 are 8-channel, 10- and 12-bit, low power, successive approximation ADCs with an I2C-compatible interface. The parts operate from a...
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AD7998 on Analog.com

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How to use AD7998 with BeagleBone



		

			

									
					    TigerClaw
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 7, 2016 
				
			
			
		
    

				
		
    
		    		    
		    
		    	
			
    Hello,
    
 
    I use the AD7998BRUZ-0 with a BeagleBone Black  via I2C and want to read a simple battery-value via V_in_1-Pin.
    
 
    But I don't know how to configure the control register with shell-commando "i2cset". To get the digital value a have to configure the control register for the next conversion signal but I don't know how.
    
 
    Thanks!
    
								
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			








	
	
	
	



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													0
							
			
				
									
							        
			
			
			
        
            
			                            
                        
                on Jun 10, 2016 9:15 PM
            
            
					
        
	
        

		
		
        
					
        I tried this on:
        
 
        root@beaglebone:/# i2cdetect -y -r 1
        
 
              0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
        
 
         00:          -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         20: -- -- 22 -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
        
 
         70: -- -- -- -- -- -- -- --
        
 
        Set adress pointer register to conversion result register
        
 
         root@beaglebone:/# i2cset -y 1 0x22 0x00
         
        read 2 bytes
         root@beaglebone:/# i2cget -y 1 0x22 0x00 w
        
 
         0xb80f
        
 
        I have a 1,5V battery on pin Vin_1 (0x80).
        
 
        I also tried this solution to write to config register and read this value but it doesn't work.
        
 
          root@beaglebone:/# i2cset -y 1 0x22 0x02
        
 
         root@beaglebone:/# i2cset -y 1 0x22 0x02 0x0a
        
 
         root@beaglebone:/# i2cget -y 1 0x22 
        
 
        What can I do to read my analog voltag on Vin_1?
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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      • 
	
        



	
		
	
	



        
	
        
		
        
							
					
        
		
        
			
													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Jun 10, 2016 9:15 PM
            
            
					
          
	
          

		
		
          
					
          I tried this on:
          
 
          root@beaglebone:/# i2cdetect -y -r 1
          
 
                0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
          
 
           00:          -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           20: -- -- 22 -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
          
 
           70: -- -- -- -- -- -- -- --
          
 
          Set adress pointer register to conversion result register
          
 
           root@beaglebone:/# i2cset -y 1 0x22 0x00
           
          read 2 bytes
           root@beaglebone:/# i2cget -y 1 0x22 0x00 w
          
 
           0xb80f
          
 
          I have a 1,5V battery on pin Vin_1 (0x80).
          
 
          I also tried this solution to write to config register and read this value but it doesn't work.
          
 
            root@beaglebone:/# i2cset -y 1 0x22 0x02
          
 
           root@beaglebone:/# i2cset -y 1 0x22 0x02 0x0a
          
 
           root@beaglebone:/# i2cget -y 1 0x22 
          
 
          What can I do to read my analog voltag on Vin_1?
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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