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ADS1298: Configuring RLD for ECG

Vladimir B
Prodigy 10 points
Part Number: ADS1298

Hello. I'm trying to understand the best way to use RLD feature. I have the following connections: (LA -> IN1P); (LL -> IN2P); (RA -> IN1N and IN2N); (RL -> RLDIN and RLDOUT and RLDINV (via C and R)).

As far as I understand, RLD feature is configured using register RLD_SENSP and RLD_SENSN. Shall I enable bits for IN1P, IN2P, IN1N for this configuration? I guess it would be a mistake to enable four bits (IN1P, IN2P, IN1N, IN2N) doubling RA contribution?

I also have V1..V6 connected to IN3P...IN8P. IN1N...IN8N are connected to WCT. Does it make sense to enable corresponding RLD_SENSP bits or it's not useful?

Also as far as I understand, RLD works best when all electrodes have good contact with skin. Shall I use lead-off detection feature for those electrodes and adjust RLD_SENSP/RLD_SENSN accordingly on the fly (enabling them only if electrode is not off)?

  • +1
    TI__Mastermind 19815 points

    Hi,

    Regarding to "I'm trying to understand the best way to use RLD feature" -

    There might not be such a thing "the best way", it depends on applications and usages.

    It's suggested to start with ADS1298EVM's RLD connection and usage and see it it meets the need, or gradually/slightly modify from it and do tests, data collection&analysis.

    Regarding "RLD feature is configured using register RLD_SENSP and RLD_SENSN. Shall I enable bits for IN1P, IN2P, IN1N for this configuration?"

    So, this is depending on customers' products designs, electrodes, cables, wires, subjects skin conditions, environment, etc. There is no best combinations. Theses are the parameters that products designers need to do  tests, data collection&analysis before making decisions. Some products don't need to use these, some use some of these. It depends all but not limited to the factors mentioned above.

    " Does it make sense to enable corresponding RLD_SENSP bits or it's not useful?"

    Same comments as above as it depends on all but not limited to the factors mentioned above.

    Shall I use lead-off detection feature for those electrodes and adjust RLD_SENSP/RLD_SENSN accordingly on the fly (enabling them only if electrode is not off)?

    Same comments as above as it depends on all but not limited to the factors mentioned above.

    Again, there is no BEST or one single combination that works the best. It all depends on customers' products designs, electrodes, cables, wires, subjects skin conditions, environment, etc. There is no best combinations. Theses are the parameters that products designers need to do  tests, data collection&analysis before making decisions. Some products don't need to use these, some use some of these. It depends all but not limited to the factors mentioned above.

    So, products designers need to do  tests, data collection&analysis before making decisions.

    It there were one and only one best single combination for ALL, then the chip would not have been designed with many variety features and parameters.

    The reality is that it depends on so many and not limited to those factors mentioned above, so the chip was designed to provide many variety of options and combinations, and then the product designers will need to turn/play, tests and do tests, data collection&analysis before making decisions based on the factors above and the applications, usages, environments and all the peripherals. 

    Thanks