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ADS1298ECGFE-PDK: Not getting the channel actual data

Parthkumar Patel
Prodigy 20 points
Part Number: ADS1298ECGFE-PDK

Tool/software:

Hello,

i'm using the ADS1298ECGFE-PDK board so i'm trying received the actual data from channel 1 so i apply the 1.8v dc voltage in the positive terminal on channel 1 input and negative terminal connected with WCT i'm setting the reference voltage is 2.4v so you can share me the what is the register config on channel setting ? now i'm setting resister is 0x05 o it's right or not please check all the resister setting below.

conf|config1  0x01  0x86
conf|config2  0x02  0x10
conf|config3  0x03  0xDC
conf|loff         0x04  0x03
conf|ch1set   0x05  0x05
conf|ch2set   0x06  0x91
conf|ch3set   0x07  0x91
conf|ch4set   0x08  0x91
conf|ch5set   0x09  0x91
conf|ch6set   0x0A  0x91
conf|ch7set   0x0B  0x91
conf|ch8set   0x0C  0x91
conf|rldsensp     0x0D  0x00
conf|rldsensn     0x0E  0x00
conf|loffsensp    0x0F  0xFF
conf|loffsensn    0x10  0x02
conf|loffflip    0x11  0x00
conf|gpio            0x14  0x00
conf|pace     0x15  0x00
conf|resp           0x16  0xF0
conf|config4       0x17  0x22
conf|wct1      0x18  0x0A
conf|wct2      0x19  0xE3

  • 0
    TI__Guru 60056 points

    Hello Parth,

    Please review the channel register settings in Figure 79 as well as the MUX block diagram in Figure 25. Currently, you have configured Channel 1 to measure the internal test signal, not the voltage present on the IN1P/N pins.

    If 1.8V is applied to IN1P, what is the voltage on IN1N? WCT is derived from the average of 3 input pins, but none of these other input pins are currently used in the configuration you described. Remember that the differential input voltage to any channel is limited to ±VREF/Gain. At Gain = 6, IN1N must be limited to 1.8V ± (2.4/6).

    Regards,

    Ryan

  • 0 in reply to Ryan Andrews
    Prodigy 20 points

    Hello ryan,

    Thanks for suggesting but currently i'm facing issue not show the negative wave. i applied sine wave ±200mv signal so what can issue this IN1N applied ground IN1P Positive lead connected

  • 0 in reply to Parthkumar Patel
    TI__Guru 60056 points

    Hello Parth,

    I'm not following the problem clearly. Have you changed the input source from 1.8V DC to a sine wave with 200mVp amplitude? What is the common-mode voltage of that signal? Also, what are the analog supply voltages - and are they unipolar or bipolar? Have you updated the register settings according to my previous reply?

    A diagram showing the input connections and jumper configurations, as well as updated register settings and measurement results, would help me understand what the issue is and offer useful suggestions.

    Regards,

    Ryan