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ADS1299: ADS1299 Application Medical

SimonC
Intellectual 345 points
Part Number: ADS1299

Hello All:

Some questions need your stronger support!

1) Regarding to Lead-Off function, how to measure the contacting resistance?

2) Whether this device have signal for collecting function?

  • 0
    TI__Mastermind 38745 points

    Hello Simon,

    1. There is no way to "measure" the electrode impedance with good accuracy. The lead-off detection circuit is intended to only detect if the impedance too large. DC lead-off is done by injecting a current on each of the electrodes and internally comparing the voltage to a threshold. AC lead-off detection is done by injecting a square wave current on each channel, and looking at the output data spectrum for the voltage magnitude corresponding the the impedance across that channel. There are several issues that you would face using ac lead-off as a means to measure electrode impedance. Refer to the ADS1299 datasheet for more information regarding lead-off detection. Do you need to perform lead-off detection or provide accurate measurement?
    2. Can you rephrase this question? I do not know what you mean.

    Regards,

    Brian Pisani