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ADS1292R Respiration measurement

Victor Gorordienko
Prodigy 120 points
Other Parts Discussed in Thread: ADS1292R

H!

1. Can I get respiration rate with only two electrodes (without RLD, GND) ? 

2. Where the electrodes should be placed to get the best respiration rate ?

  • 0
    TI__Mastermind 38745 points
    Hey Vic,

    1. Yes. The inputs that are used for respiration rate measurement will be AC coupled so there is no need for the RLD for patient drive.
    2. Unfortunately our lawyers say I can't advise you on electrode placement for liability reasons, but a quick internet search for your question may yield an answer for that.

    Regards,
    Brian Pisani
  • 0 in reply to Brian Pisani
    Prodigy 120 points

    Thanks. I have a problem, with respiration meassurement, I get only noise. 

    Configuration for ADS1292R:

    ADS1292_WriteRegister(ADS1292_REG_CONFIG1, 0x00); 
ADS1292_WriteRegister(ADS1292_REG_CONFIG2, 0xA0);
ADS1292_WriteRegister(ADS1292_REG_CH1SET, 0x60);
ADS1292_WriteRegister(ADS1292_REG_CH2SET, 0x80);
ADS1292_WriteRegister(ADS1292_REG_RESP1, 0xD6); 
ADS1292_WriteRegister(ADS1292_REG_RESP2, 0x81); 
ADS1292_WriteRegister(ADS1292_REG_RLD_SENS, 0x20);
ADS1292_WriteRegister(ADS1292_REG_LOFF, 0x10);
ADS1292_WriteRegister(ADS1292_REG_LOFF_SENS, 0x00);
ADS1292_WriteRegister(ADS1292_REG_LOFF_STAT, 0x00);
ADS1292_WriteRegister(ADS1292_REG_GPIO, 0x00);

    Schematic:

    I connected oscilloscope to RESP_MODN and RESP_MODP and got square wave.

    What could be wrong ? How I can check it ? 

  • 0 in reply to Victor Gorordienko
    TI__Mastermind 38745 points

    Hey Vic,

    Your register configurations are correct. You should expect to see a 32 kHz, 2.42 V square wave between RESP_MODP and RESP_MODN. You should see an attenuated version of that signal at IN1P and IN1N. The magnitude of attenuation should vary with respiration. How are you attempting to measure it? Are electrodes connected to a patient simulator? You can calculate the baseline body impedance by dividing the DC component of the output voltage by 30 uA.

    Regards,

    Brian Pisani