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LDC1000 vs LDC1612/LDC1614 vs LDC1312/LDC1314

Other Parts Discussed in Thread: LDC1612, LDC1312, LDC1314, LDC1614

Hi everyone,

I'm interested in make an inductive sensing application where the main task is to detect multiple moving tags so I need multiple sensor coils.

Every tag must be detected in the shortest possible time, in the worst case in about 1.5 ms.

At the moment I have only one LDC1000 and I wonder if the best idea is to use multiple LDC1000 or the two-four channel capability of LDC1612/LDC1614 and LDC1312/LDC1314. So I ask:

1) LDC1612/LDC1614 can detect moving objects in about 1.5ms or there are some limitation in the usable number of channel due to time transition/delay (I read dwell time interval at page 12 of the datasheet)?

2) LDC1612/LDC1614 have an impressive resolution. There is some internally trade off between resolution and measure time? In this case may I use LDC1312/LDC1314 with a lower resolution?

3) If I use multiple LDC1000 (multiple uC) there are some synchronization problems among measurements like frequency count and proximity data?

4) Which LDC is more suited for my task?

Thanks in advance

Best regards,

Alberto

  • Hello Albi,

    If only inductance measurement is needed, LDC13xx/LDC16xx is a superior solution. Both LDC13xx and LDC16xx use I2C and their sampling rate is the same. Here is what I would do in your place:

    1. Decide of total # of channels needed for the application
    2. Approximate the sampling rate for LDC13xx/16xx based on the # of channels
    3. Decide of resolution needed for the application. If high -> LDC16xx, else -> LDC13xx.
    4. LDCxx12 is used for 2 channels, when LDCxx14 is udes for 4.

    Best Regards,
    Natallia Holubeva
  • Hi Natallia,
    thank you very much for your reply.
    Yes I need only inductance measurement because my primary task is the detection of moving object with a great resolution. I choose this type of measurement because with LDC1000 I see too much noise in proximity data. I think 4 channel is the best choice for me because in my application I need to detect tags as many as possible at the same time. So probably I will opt for LDC1614.

    How could I approximate the LDC1614 sampling rate? Is there an equation? The datasheet don't seem very clear about it

    Best regards
    Alberto
  • Hello Alberto,

    Good decision on your design! You rather need to know how fast you need to sample. It should be application-dependent. For example, if I rotate a knob at 1RPS and I need maximum of 2000 samples per rotation, I would choose the sampling rate of 2kSPS.

    Sampling rate is then used for calculating conversion time for LDC1614, which would lead you to a certain value for CHx_RCOUNT register.

    Best Regards,
    Natallia Holubeva
  • Hello Natallia,
    thank you very much, now is clearer.

    Best regards,
    Alberto
  • Hello Alberto,

    You are very welcome.

    ~Natallia