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Shutting down of channel 3 data coming from ads1293 in wireless heart monitor

Sowmya N
Intellectual 270 points
Other Parts Discussed in Thread: ADS1293

Hi,

I have currently changed the 5 lead ECG application into 3 lead according to the details given in the ADS1293 datasheet.

1. Are the changes given in the ads1293 datasheet enough to program it into a 3 lead application? cause even after making the changes i get data in channel 3.

2.I would like to stop the channel 3 data, cause its not necessary for our requirement?what are the registers that control the channel3 data flow and a way to stop it either in registers or coding?

  • 0
    TI__Genius 17975 points
    I will have someone from the HealthTech team get back to you on this.
  • 0 in reply to Willis1
    Intellectual 270 points
    Thank you. Some quick guidance will be helpful.
  • 0 in reply to Willis1
    Intellectual 270 points
    Hai,some guidance for my question will be helpful please
  • 0
    TI__Expert 3835 points
    Hi Sowmya,

    Apologies for the delay, I was out of the office.

    If you are using the streaming mode (section 8.5.6 of the datasheet), where all data is read from register 0x50, you can use register 0x2F to select which channels you would like to read from in streaming mode. If you select ECG channels 1 and 2 only, chip-select should stay low for 56 clock cycles (8+8*N, where N is the number of bytes to read). If you clock in more cycles while chip-select remains low, the state-machine controlling the streaming mode will start again.

    I would recommend you to switch off the INA and the SDM of the unused channel 3 by programming register 0x14 = 0x24. Additionally, disable the ECG filter for channel 3 by setting register 0x26 = 0x04.

    Please let me know if you are using a different method to read the ECG data on the SPI interface.

    Thanks,
    Sergio