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TDC1000-Q1: Minimum distance measurement - TDC1000

William Martin45
Prodigy 10 points
Part Number: TDC1000-Q1
Other Parts Discussed in Thread: TDC1000, TDC7200

Hi,

I am working on a project to measure volume of water in a tank using the TDC1000 and TDC7200 - I have it all working accurately until the height drops below 18mm below 18mm the system continues to read 18mm.

I am new to working with this sort of technology so I have a couple of questions.

I am wondering:

A) What is the minimum distance that can be measured?

B) Can I get some suggestions as to what settings may be wrong on the TDC1000?

Thanks,

Will

  • 0
    TI__Mastermind 31655 points

    Hi Will,

    The minimum distance that can be measured is mostly dependent on the transducer you are using. The frequency of the transducer and the ringdown characteristics both impact the minimum distance. Exciting the transducer takes a certain amount of time, and even when the excitation has stopped, the transducer will continue ringing for a certain amount of time. Throughout this time, any return echo will be masked by the initial output of the transducer.

    Settings on the TDC1000 that could impact this minimum time depend on the mode it is in. For standard TOF mode the TIMING_REG, AUTOZERO_PERIOD, and common mode settling time can increase the minimum distance. In Short TOF mode, the SHRT_TOF_BLNK_PRD register will affect the minimum distance.

    Below are plots from the datasheet that show the effects of these registers.