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FDC1004: FDC1004

user6216230
Prodigy 50 points
Part Number: FDC1004
Other Parts Discussed in Thread: FDC2114

Hello.
I am trying the FDC1004 integration for an industrial project.
I noticed that the value I read with i2C slipped after a while (a few minutes later).
I tried it in a second period, thinking that the problem might be caused by the circuit.

I tried it in a second integration, thinking that the problem might be caused by the integration.

The value continued to slipt(or shift).

A second series in my hand; FDC2114
I did the experiment on this. After 1-2 days, the value continued to slipt(or shift).
The values I read with FDC1004;

value : 6950370 

.... a few seconds

value : 6960318

... a few seconds

value : 6965237

... a few seconds

value : 6969183

... a few seconds

value : 6980709

... a few seconds

value : 6987472

... a few seconds

value : 6996295

... a few seconds

value : 7011774

...........7041088

These data are not raw data.

Bubble sort filter was applied in a 100-element array.

  • 0
    TI__Expert 3435 points

    Hi,

    We have received your question. I will get back to you in 2-3 days.

    Regards
    Sharath.

  • 0 in reply to Sharath Vallamkonda
    TI__Expert 3435 points

    Hi,

    Please share the raw data for this measurement. It is difficult to understand what could be wrong with the shared data.

    Regards

    Sharath.

  • 0 in reply to Sharath Vallamkonda
    Prodigy 50 points

    Hello again.

    Raw data;

    8264127
    8265718
    8274179
    8267474
    8249038
    8271534

    ....

    8301048
    8318869
    8301832
    8294324
    8281856

    ....

    8300944
    8286262
    8322932
    8314002
    8302491
    8286243

    ...

    8286875
    8316973
    8313650
    8321543
    8306253
    8286603

    What I'm trying to say is this;

    Examine 3 digits on the left 

    Any object is approaching.
    There is no change in the environment.

    However, the values are increasing.
    So even though the object is not approaching, I perceive it to exist

  • 0 in reply to user6216230
    TI__Expert 3435 points

    Hi,

    Thank you for providing the raw data.

    I am wondering if this is related to I2C reading issue? Did you make sure that the I2C communication has no issues while you are reading this data continuously? How many devices showed this behavior? Is it on a few boards or all of them are showing the same pattern?

    Regards

    Sharath.

  • 0 in reply to Sharath Vallamkonda
    Prodigy 50 points

    Hello. Thankyou for answer. 

    Two of the 3 sensors showed.
    Then I soldered the properly functioning sensor to another pcb.
     it started shifting the values.

    (I think) Unlike other companies, you do not provide code support. 
    I don't know if there might be an error in my code.

    // CHA+ slct CHB- slct CH - offset
    FDC1004_write(CONF_MEAS1, 0x1000); //0x08 ||000 < || 100 || 00001
    FDC1004_write(CONF_MEAS2, 0x1c00);
    FDC1004_write(CONF_MEAS3, 0x1c00);
    FDC1004_write(CONF_MEAS4, 0x1c00);

    FDC1004_write(FDC_CONF, 0x0580);            //0x0c//0000110010000000 0x0580
    FDC1004_write(OFFSET_CAL_CIN1, 0x3fff); //0x0D//0x0D 16.384 //3fff
    FDC1004_write(GAIN_Cal_CIN1, 0x500F);    //0x11 16.384

    done = FDC1004_read(FDC_CONF);

    if(bit_test(done,3))
    {
    MEAS1_LSB_1 = FDC1004_read(MEAS1_LSB);
    MEAS1_MSB_1 = FDC1004_read(MEAS1_MSB); // 0x1c
    MEAS1_LSB_1_H = make8(MEAS1_LSB_1,1);
    MEAS1_LSB_1_L = make8(MEAS1_LSB_1,0);
    LAST_VALUE = make32(MEAS1_MSB_1,MEAS1_LSB_1_H);


    }

  • 0 in reply to user6216230
    Prodigy 50 points

    Hello there. Were you able to find a solution? I also used the last integration in my hand. Others are slipping too. :(

  • 0 in reply to user6216230
    TI__Expert 3435 points

    Hi,

    Can you share the setup of the application? I am not sure what could be causing based on the provided information.

    How many devices were showing this behavior? Can you test the sensor and application by attaching it to the EVM?

    Regards

    Sharath.