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TDC7201 for Ultrasonic Distance Measurement

Kai Hsiao
Guru 12675 points
Other Parts Discussed in Thread: TDC7200, TDC7201, TDC1000

Dear Sir 

We would like to do ultrasonic application for distance measurement 

Do you have recommend sensor or schematic for TDC7201?? or TDC7200 can do this feature 

I saw below schematic use Murata sensor ,May I use below sensor to do?? Have anything I need to take care ??

Thanks

  • 0
    TI__Mastermind 21685 points
    Kai,

    For short distance measurements in air using TDC1000 (which is the ultrasonic analog front end), please check this posting
    e2e.ti.com/.../498792

    In the above posting, we use Bestartech 200kHz transducer BPU19200IFAH11 and also uses the TDC1000-GASEVM board for demonstration. This board comes with a 30V boost circuitry so the transducer can be excited with 30V pulses. Since air is absorptive you need higher excitation voltage when using TDC1000. Note TDC7200 (or TDC7201) functions as the stop watch to measure the time duration between start and stop outputs of TDC1000.


    Thanks,
    Vishy
  • 0 in reply to Vishy Viswanathan
    Guru 12675 points
    Dear Vishy

    Thanks for your reply
    May I know
    1. how to use TDC1000-GASEVM to connect with BPU192001FAH11 ?? J1 or J2 ??
    2. In this application ,TDC7200 can remove or not ?? Use MCU to detect START and STOP ??

    Thanks
  • 0 in reply to Kai Hsiao
    TI__Mastermind 21685 points
    Kai,

    1. Yes, you have to connect it to J1 as shown in
    e2e.ti.com/.../498792

    2. If picosecond resolution and accuracy is not needed, you can use the MCU timer as the stop watch. In this case, MSP430 timer can be used. It is already connected to the start/stop pins of TDC1000. In the GUI, you have to enable MSP430 as the TDC timer in the setup tab to do measurements.

    Thanks,
    Vishy