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ADAS1000-4 Recommended for New Designs
The ADAS1000-3 / ADAS1000-4 measure electro cardiac (ECG) signals, thoracic impedance, pacing artifacts, and lead-on/off status and output this information...
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ADAS1000-4 on Analog.com

ADAS1000-2 Recommended for New Designs
The ADAS1000-2 is one of the ADAS1000 family of ECG Front ends. It’s been designed to measure electro cardiac (ECG) signals and lead-on/off status and...
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ADAS1000-2 on Analog.com

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CMREFCTL Register setting clarification ADAS1000-4

		
	
				

			

									
					    subbu
					
							

            
            			
				
									
											
			
			
				
    
			
			
			    	
			                    
                
				                on Aug 16, 2023 
				
			
			
		
    
		
		                    	    
    
        	    
    Thread Summary
    
                The user is using ADAS1000-4 and ADAS1000-2 in a design with RA connected to CM_IN. Setting EXTCM to 0 (internal common mode) allows lead on/off detection to work correctly, while setting EXTCM to 1 (external common mode) results in RA and RLD showing lead off and setting overrange/underrange bits in the DC Lead OFF register (0x1E). The support engineer confirmed that for master devices, EXTCM should typically be set to 0.
                        	    
    
                
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    Product Number:  ADAS1000-4 
    
    		        		    		    
    
		    		    
		    			
    
			    
    Hi Mark,
    

    We are using ADAS1000-4 and ADAS1000-2 in our design. We have connected RA to CM_IN pin of ADAS1000-4. In this configuration, Can you clarify, if we need to set, EXTCM bit (2) in CMREFCTL register to 0 (Internal common mode selected) or 1(external common mode selected).
    

    When we set EXTCM to 0: Lead on/off detection is working fine.
    

    When we set EXTCM to 1: RA and RLD is showing Lead off. In DC Lead OFF register (0x1E), Bit 13 CE input overrange and Bit 12 RLD input underrange are setting to 1. 
    

    Thanks and Regards,
    

    Subbash
    
			
    
			
									    
    
			        
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    				Updated title
    
[edited by: subbu at 7:44 AM (GMT -4) on 16 Aug 2023]
				
    
						
		                             
                        

    
    
                                            
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