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Products Mentioned

ADUCM355 Recommended for New Designs
The ADuCM355 is an on-chip system that controls and measures electrochemical sensors and biosensors. The ADuCM355 is an ultralow power, mixed-signal microcontroller...
Datasheet
ADUCM355 on Analog.com

AD5940 Recommended for New Designs
The AD5940 and AD5941 are high precision, low power analog front ends (AFEs) designed for portable applications that require high precision, electrochemical...
Datasheet
AD5940 on Analog.com

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ADuCM355 4 wire impedance measurement electrode setup

		
	
				

			

									
					    Anzinc
					
							

            
            			
				
									
											
			
			
				
			
			
			    	
			                    
                
				                on Sep 9, 2025 
				
			
			
		

		
		                     
				
        		

		    
		    		    

		      		            		        
Category: Datasheet/Specs

    		        		            		    
Product Number:  ADUCM355  

    		        		    		    

		    		    
		    			

			    
hi team.
I was designing custom board using AD5940 + MCU.

Since I noticed there is aducm355 which contains  MCU itself, I'm moving to aducm355.

As far as I know, In AD5940's BIA example, use CE0 and AIN1 for current, AIN2 and AIN3 for measure voltage.

As ADuCM355 is same AFE, ADuCM355's 4WireZ example also use AIN1~AIN3.


Before making a ADuCM355 based custom board, I would like to use EVAL ADuCM355.

In this development evaluation board, there are RE0, CE0, SE0, DE0 electrodes for sensors connector.

Is it possible to modify the code of 4WireZ and use these electrodes to measure the impedance of 4 electrodes? (CE0 & DE0 for current, RE0 & SE0 for measure voltage)

			

			
									
		                             
                        

    

                                            
                 Datasheet/Specs
                
                                                    
                 sensors
                
                                                    
                 Sensors and MEMS
                
                                                    
                 aducm355
                
                                                    
                 Electrochemical Sensors
                
                                
            

    
    
		


				
				        
        		

			
						
									
												
			
			
                        
                                    
                        
                        
                        
            
			            
						
						
			
			
			
			
		


        
        
        
    
					

			





















	

	

					



			


				
	









	
    
	

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Sep 14, 2025 12:58 AM
            
            
						
			            		
    
		
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    Hi,
    

    I will contact the product owner and get back to you soon.
    

    regards,
    

    Coco
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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    •  Analog Employees  
    
            
						
                            
            
            				
            
                on Jan 23, 2026 3:49 AM
            
            
						
			            		
    
		
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    Hi,
    

    Yes. It can be done. Except that SE0 cannot be ADC mux -ve input.
    

    See available options in ad5940.h
    

    .............
.............
 AD5940_SEQGenInsert(SEQ_WAIT(16*250));  /* @todo wait 250us?? */
  sw_cfg.Dswitch = SWD_CE0;
  sw_cfg.Pswitch = SWP_CE0;
  sw_cfg.Nswitch = SWN_DE0LOAD;
  sw_cfg.Tswitch = SWT_DE0LOAD|SWT_TRTIA;
  AD5940_SWMatrixCfgS(&sw_cfg);
  
  AD5940_ADCMuxCfgS(ADCMUXP_HSTIA_P, ADCMUXN_VZERO0);
  AD5940_AFECtrlS(AFECTRL_WG|AFECTRL_ADCPWR, bTRUE);  /* Enable Waveform generator, ADC power */
  AD5940_SEQGenInsert(SEQ_WAIT(16*50));
  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT, bTRUE);  /* Start ADC convert and DFT */
  AD5940_SEQGenInsert(SEQ_WAIT(WaitClks));  /* wait for first data ready */  
  AD5940_AFECtrlS(AFECTRL_ADCCNV|AFECTRL_DFT|AFECTRL_WG|AFECTRL_ADCPWR, bFALSE);  /* Stop ADC convert and DFT */

  AD5940_ADCMuxCfgS(ADCMUXP_VRE0, ADCMUXN_AIN2);
  AD5940_AFECtrlS(AFECTRL_WG|AFECTRL_ADCPWR, bTRUE);  /* Enable Waveform generator, ADC power */
  .............
  ..............
    
			
    

		
			
	      

		
		
	
    
	
    
		
    
			
		
    
	
    
	
    
		
						
						
				
						
				
				
		
		
    
			
		
    
	
    

    

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