Products Mentioned

ADXL357 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...
Datasheet
ADXL357 on Analog.com

Associated Drivers

ADXL355 Recommended for New Designs
The analog output ADXL354 and the digital output ADXL355 are low noise density, low 0 g offset drift, low power, 3-axis accelerometers with selectable...
ADXL355 on Analog.com

Associated Drivers

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Susceptibility of ADXL357 MEMS to getting "stuck" compared to ADXL355

		
	
				

			

									
					    VictorInSD
					
							


			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Jun 24, 2024 
				
			
			
		
    
		
		                     
				
        		
    
		    
		    		    
    
		      		            		        
    Category: Hardware
    
    		        		            		    
    Product Number:  ADXL357  
    
    		        		    		    
    
		    		    
		    			
    
			    
    We have been experiencing the ADXL355 getting "stuck" after vibration tests on our product.  The ADXL357 was suggested as a replacement due its higher G range capability.  How much more G load can the 357 withstand before getting stuck, if ever, compared to the 355?  If the 357 could still experience sticking, would it require significantly more of a shock to unstick it?  Right now what we see with the 355 is that it doesn't take much movement or vibration to unstick it.  From other posts, I do realize that the device may experience damage when it gets stuck, so we are trying to avoid it entirely with the 357.  Thanks
    
			
    
			
									
		                             
                        

    
    
                                            
                 adxl357
                
                                                    
                 hardware
                
                                                    
                 accelerometers
                
                                                    
                 Sensors and MEMS
                
                                
            
    
    
    
		
    

				
				        
        		
    
			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		
    

        
        
        
    
					
    
			
    


    
















    
	
    
	
    
					



			








	
	
	
	



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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Jun 27, 2024 4:17 PM
            
            
						
			            		
      
		
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      Thank you for your post.  I am not sure when you received the guidance to move to the ADXL357, but we have recently released the ADXL357B, as well.  The primary difference is that the ADXL357B is the same as the ADXL357, except that it's response is close to critically damped, which increases the level of vibration that it can tolerate, before experiencing mechanical contact.  Generally speaking, the mechanical headroom, which drives the "contact level of static acceleration," is 5 times greater in the ADXL357/ADXL357B, than it is in the ADXL355.  Perhaps as important is the different in resonant frequency and Q. 
      

      ADXL355: fo = 2.2kHz, Q = 7
      

      ADXL357: fo = 5.6kHz, Q = 14
      

      ADXL357B: fo = 5.6kHz, Q = 1.4
      

      For a sensor that is stuck, the restoring force is 5x greater in the ADXL357/ADXL357B, than it is for the ADXL355, which I suspect, is why we have very few reports of ADXL357 or ADXL357B being stuck.  In fact, I can only remember 1 situation that I was a part of, which was a very extreme environment (which I cannot quantify, due to customer NDA.
      

      Does this help?  
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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      •  Analog Employees  
      •  Super User  
      
            
						
                            
            
            				
            
                on Jun 27, 2024 4:17 PM
            
            
						
			            		
      
		
										0
					
	
      

		
		
      
		
      
                                
                                                            
      
					
      Thank you for your post.  I am not sure when you received the guidance to move to the ADXL357, but we have recently released the ADXL357B, as well.  The primary difference is that the ADXL357B is the same as the ADXL357, except that it's response is close to critically damped, which increases the level of vibration that it can tolerate, before experiencing mechanical contact.  Generally speaking, the mechanical headroom, which drives the "contact level of static acceleration," is 5 times greater in the ADXL357/ADXL357B, than it is in the ADXL355.  Perhaps as important is the different in resonant frequency and Q. 
      

      ADXL355: fo = 2.2kHz, Q = 7
      

      ADXL357: fo = 5.6kHz, Q = 14
      

      ADXL357B: fo = 5.6kHz, Q = 1.4
      

      For a sensor that is stuck, the restoring force is 5x greater in the ADXL357/ADXL357B, than it is for the ADXL355, which I suspect, is why we have very few reports of ADXL357 or ADXL357B being stuck.  In fact, I can only remember 1 situation that I was a part of, which was a very extreme environment (which I cannot quantify, due to customer NDA.
      

      Does this help?  
      
			
      

		
			
	      

		
		
	
      
	
      
		
      
			
		
      
	
      
	
      
		
						
						
						
						
				
				
		
		
      
			
		
      
	
      

      

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