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AD5292

		
	
				

			

									
					    electro633
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Nov 19, 2024 
				
			
			
		

		
		                    	    

        	    
Thread Summary

                The user encountered issues with an AD5292 digital potentiometer not responding to SPI commands to adjust resistance, despite correct configuration and command framing. The solution involved ensuring the idle SCLK is low during the SYNC transition to a falling edge, as per the timing diagrams. Additionally, the user needed to write to the control register to disable write protect before executing the RDAC write command (0x1802).
                        	    

                
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Category: Hardware

    		        		            		    
Product Number:  AD5292 

    		        		    		    

		    		    
		    			

			    


Hi


 


I have a digital potentiometer connected via SPI to microcontroller. STM32F303K8. SPI clock frequency is 1 MHz.


 


On power on, the potentiometer is set to middle position, 10 kOhm on each side (RWA and RWB). Measuring with multimeter.


 


I am sending command as per datasheet. 16 bits in one SPI frame.


MSB


0 0


0 0 0 1 - command for setting RDAC


10 bits for data


LSB


 


Idle clock is high, data is valid on falling edge (checked on logic anyzer)


 


RESET pin is connected to 3V3


VDD is 9V


GND is common to microcontroller


Vlogic is 3V3


pin 14  NC


 


 


Despite verifying the SPI configuration and sending the command frame as required, I am unable to get the potentiometer to respond and adjust its resistance.


 


 


 


Side note:


We have working AD5280 via I2C bus, which is 8-bit device, but we beed more resolution. Based on requirement for voltages up to 8 V, we selected the AD5292 digital potentiometer.


 


 




Could you please advise on any additional troubleshooting steps or potential issues with my current configuration?


Thank you for your support.


Best regards,
 Urban




 




 





			

			
									
		                             
                        

    

                                            
                 D/A Converters (DAC)
                
                                                    
                 hardware
                
                                                    
                 data converters
                
                                                    
                 ad5292
                
                                                    
                 Digital Potentiometers (DigiPOT)
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	




	
			








		

		

			
    
				
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