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ADS1296R lead off detection issue

Other Parts Discussed in Thread: ADS1296R, ADS1296

Hello Folks,

Need Small favor in ECG-Lead-OFF Detection, below are the configuration and the test result. We are using ADS1296R as AFE.

                            We are able to find/status update Lead-OFF for LA and LL , But NOT RA,V1 and RL as with the CONFIG_Register -3 BIT1 and BIT0. Please kindly help us in this issue.

 

                            Lead Off Detection – Register Configuration:

                                                                              Config 3:             0xFC

                                                                              Lead OFF Reg:  0xE0

                                                                                                             We also configured-  70-95% of the threshold current of 6-24nA range which are available in the Datasheet of ADS1296.

                                                                             Lead_SENSP:     0x0E   

                                                                             Lead_SENSN:    0x0E

                                                                             CONFIG 4:          0x22  (0x02 is the BIT1 for Lead off Comparator Enable)

 

Result : is the value in Status register. First 3(24bits) bytes is the Status register in every read(Continuous read mode) cycle.

RA

LA

LL

RL

V1

Result

0

0

0

0

0

0xC36000

0

0

0

1

0

0xC36000

0

0

1

1

0

0xC32000

0

1

0

1

0

0xC34000

0

1

0

0

0

0xC34010

 

 

 

 

 

0xC37000

 

 

 

 

 

0xC36000

1

0

0

1

1

0xC36000

0

1

1

1

0

0xC30000

Thanks,
Srijan

  • Srijan,

    I am moving your post to the Precision Data Converters forum. They should be able to answer you.
  • Hey Srijan,

    Would you mind sending me the schematic? I'm not sure to which channels the leads are connected. I noticed a couple things in your configuration that you may need to change, however. Are that you are clearing bits [1:0] of the LOFF register and that you. If you are trying to perform DC lead-off detection, those bits need to be set. Also, by clearing bit 1 of the CONFIG3 register, you are disabling the RLD lead-off detection circuitry.

    Regards,
    Brian Pisani