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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 15, 2016 10:26 AM
            
            
					
        
	
        

		
		
        
					
        I tried this here without the CONVST-Signal for a 3,3 volt battery:
        
 
        root@beaglebone:/# i2cset -y 1 0x22 0x02 0x1000 w (set Config-Register for Vin_1, 0x1000 == 0x010 )
        
 
        root@beaglebone:/# i2cset -y 1 0x22 0x80 (Vin_1, Page. 29)
        root@beaglebone:/# i2cset -y 1 0x22 0x02         (write Conf-Reg. to Adress Pointer Reg.)
        
 
        Maybe in Mode 2 it's also possible to use 0x80 / 0x82
        root@beaglebone:/# i2cget -y 1 0x22 0x00 w
        
 
        0xad09
        
 
        because we have 12 bits and LSB is first.--> result: 0x9ad=2V
        
 
        ---------------------------------------------------------------------------
        
 
        Batterie mit 1,5V
        
 
        root@beaglebone:/# i2cset -y 1 0x22 0x80
         root@beaglebone:/# i2cset -y 1 0x22 0x02
         root@beaglebone:/# i2cget -y 1 0x22 0x00 w
        
 
        0xf604
        
 
        Whats wrong with my command? Did I forget something?
        
			
        

		
		
		
		
	
        
	
        
		
        
			
		
        
	
        
	
        
		
						
						
				
						
				
				
		
		
        
			
		
        
	
        

        

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													0
							
			
				
									
							        
			
			
			
          
            
			                            
                        
                on Jun 15, 2016 10:26 AM
            
            
					
          
	
          

		
		
          
					
          I tried this here without the CONVST-Signal for a 3,3 volt battery:
          
 
          root@beaglebone:/# i2cset -y 1 0x22 0x02 0x1000 w (set Config-Register for Vin_1, 0x1000 == 0x010 )
          
 
          root@beaglebone:/# i2cset -y 1 0x22 0x80 (Vin_1, Page. 29)
          root@beaglebone:/# i2cset -y 1 0x22 0x02           (write Conf-Reg. to Adress Pointer Reg.)
          
 
          Maybe in Mode 2 it's also possible to use 0x80 / 0x82
          root@beaglebone:/# i2cget -y 1 0x22 0x00 w
          
 
          0xad09
          
 
          because we have 12 bits and LSB is first.--> result: 0x9ad=2V
          
 
          ---------------------------------------------------------------------------
          
 
          Batterie mit 1,5V
          
 
          root@beaglebone:/# i2cset -y 1 0x22 0x80
           root@beaglebone:/# i2cset -y 1 0x22 0x02
           root@beaglebone:/# i2cget -y 1 0x22 0x00 w
          
 
          0xf604
          
 
          Whats wrong with my command? Did I forget something?
          
			
          

		
		
		
		
	
          
	
          
		
          
			
		
          
	
          
	
          
		
						
						
				
						
				
				
		
		
          
			
		
          
	
          

          

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