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ADXL356 Recommended for New Designs
The analog output ADXL356 and the digital output ADXL357 are low noise density, low 0 g offset drift, low power, 3-axis accelerometers with selectable...
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ADXL356 on Analog.com

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ADXL356 Power Up Sequencing



		

			

									
					    ABierman1986
					
							

			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 24, 2023 
				
			
			
		
    

				
		
    
		    		    
		    
		    		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADXL356BEZ 
    
    		        		    		    	
			
    ADXL356 is connected to 3V for VDDIO and is supplied with external 1.8V from an amplifier dividing the 3V down to 1.8V to provide a reference voltage.  I'm finding that on power-up the device is not coming online, and I have to remove power for ~15seconds and re-apply. Once that's done the device powers up and remains up.  If I remove power for longer than ~30s, the problem occurs again, and I have to power on and then power off for 15 seconds.  If I remove power for only a short amount of time then everything comes back up when I apply power. Can you help me understand what is happening with the device so I can figure out a solution so that it powers up correctly the first time?
    

     
    
									
			        
		
    

				
				
		
    
			
						
									
									
						
						
			
			
			
			
		
    

        
        

					
    
			
    


    


	
    
		
	
    















    
	
    
	
    
					



			


				
	









	
      
	

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      •  Analog Employees  
      •  Super User  
      
            
			                            
                        
                on Aug 25, 2023 1:56 PM
            
            
					
      
	
      

		
		
      
					
      Thank you for posting your question in this forum.  I suspect that we might need to inspect the ramp profiles of your supplies, in order to assess this properly.  I am not aware of any mechanism, inside of these devices, which would have sensitivity to 15 vs 30 seconds of off time.  That is tough to imagine, as a primary suspect for strange behavior. Could you measure your supply ramp profiles, on a common scope screen for time coherence and post? 
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
				
						
				
				
		
		
      
			
		
      
	
      

      

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