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ADS1293: ADS1293, about WCT

Hyun woo Cha
Prodigy 30 points

Part Number: ADS1293

Hi, Dear

I got curious for WCT.

Could i take typically analog data to WCT?

I mean such as SPI data (0x37 ~ 0x39)

Because I want to see as a Oscilloscope.

and XTAL1, XTAL2 (4.096MHz)

Could I make a waveform(PWM) at the MCU and give it to them?

Thank you!

  • 0
    TI__Genius 11550 points

    Hi Hyun Woo,

    Welcome to the E2E forum !!!

    I am not clear as to your questions for the WCT. Can you please elaborate?

    Please refer to Section 8.3.10 for the operation of the WCT (Wilson Reference). The WCT output is mainly used as the reference voltage for the chest electrodes. It is defined as the average of the three limb electrodes, RA, LA, and LL (WCT = (RA + LA + LL)/3).

    You can provide your external clock to the device if you are not using the on-chip crystal oscillator. The external clock source (from MCU) must be connected to the device's CLK pin, and the XTAL1 and XTAL2 pins are not used in this configuration. Section 8.3.19 in the datasheet explains how to set up the device to use the external clock to the digital circuitry.

    Thanks

    -TC

  • 0 in reply to TCT
    Prodigy 30 points

    Thanks you for your support Slight smile

    Sorry, I think It should have explained exactly what i want.

    Anyway, Please refer to Figure 85. Single ADS1293 Device With an ECG Simulator...

    I want to look at like this on Oscilloscope. (I mean like waveform)

    So, Should I check WCT or CMOUT to see waveform on Oscilloscope?

  • +1 in reply to Hyun woo Cha
    TI__Genius 11550 points

    Hi Hyun-Woo,

    Thanks for the clarification.

    Both the WCT and CMOUT outputs are the averaging of the channel inputs and not the Lead-I and Lead-II ECG signals. Therefore, you will not be able to use the WCT or CMOUT output pins to see the Lead-I or Lead-II signals on the oscilloscope like Figure 85. The ECG Lead-I and Lead-II signals are the digitized output from the ADS1293 AFE channel 1 and 2 (see Figure 84) when configured as a 3-Lead ECG application. To see the ECG Lead-I and Lead-II waveforms, you need to capture the SPI data for both channels and plot them.

    The definition for Lead-I and Lead-II in an ECG application are as below. 

    Lead-I  = LA - RA

    Lead-II = LL - RA

    Please refer to sections 8.3.10 and 8.3.11 for more detailed information on the WCT and Common-Mode (CM) Detector circuits implementation.

    Thanks

    -TC

  • 0 in reply to TCT
    Prodigy 30 points

    Thanks to you! I could understand.

    Have a nice day