The DS1(fault) is always on for CN0540

Question

Hi, there
I have a problem like a link below when I use the cn0540 with de10-nano. Similarly, The DS2(Power), DS1(fault), and DS4(CC) are on, but the iio-oscilloscope can collect the IEPE sensor data, I just wondered how to fix it about the DS1(fault) is on, or what situations can make that result, thanks.
I checked the value of some test points for cn0540, when the IEPE sensor isn’t connected:
    LT3092 IN = 26.2V OUT = 25V SET = 25.2V
    VIN = 25V
    TP5 = 28.2V
    TP9 = 3.65V
    ADG5421 VDD = 26.0V、SW_CC =3.4、SW_IN=3.4、SW_FF=1.83
When the IEPE sensor is connected:
    LT3092 IN = 26.2V OUT = 8.5V SET = 8.3V
    VIN = 7.14V
    TP5 = 28.5V
    TP9 = 3.38V
    ADG5421 VDD = 26.1V、SW_CC =3.3、SW_IN=3.3、SW_FF=1.85
The DS1(fault) is always on whatever the IEPE sensor is connected.
Reference link:
RE: CN0540/DE10-nano signal wrong

FormerMember · Accepted Answer

Hi Sam007, 
 Apologizes for any confusion this may have caused, but I can confirm with you that the light for the fault (DS1) is always on during normal operation. This was an oversight during the final schematic review and should be inverted based on the logic signals coming from the ADG5421F. So effectively you can ignore DS1 when it's on, but if it turns off then you have a fault condition. 
 Here is a schematic on how to fix the fault LED polarity.)

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The DS1(fault) is always on for CN0540