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tdc1000: water flow metering

rashmi hm
Intellectual 750 points
Part Number: TDC1000-Q1
Other Parts Discussed in Thread: TDC1000, TDC7200

hai,

      am working on water flow mwtwring and am using 40Khz ultrasonic transducer what are the value of resister capacitor for band pass filter that is present in the receiver path

  • 0
    Intellectual 750 points

    Part Number: TDC1000

    hi,

        i am working on flow metering but am stuck with filter design am using 40Khz ultrasonic transducer what are the resistor capacitor values for the filter an how can we design for different frequency transducers 

  • 0
    Intellectual 750 points

    Part Number: TDC1000-Q1

    hi,

         what is the register configuration values for 40Khz ultrasonic transducer and also bandpass filter component values

  • 0
    Intellectual 750 points

    Part Number: TDC1000-Q1

    i am working on water flow metering using tdc1000 and am using 40Khz ultrasonic transducer i have used 1Kohm,5Kohm and 2.2nF capacitor to built external band pass filter i have doubt about values any one suggest me how to design this filter components 

  • 0
    TI__Mastermind 31655 points

    Hello,

    I've merged your threads because these all seem to be asking the same question. In the future please only create one thread per question.

    Formulas for calculating component values for the receiver filter are located in the datasheet in section 8.3.5 "Receiver Filters." If you are currently designing the system from scratch, you can use any filter topology you like as long as it is referenced to VCOM.

    If you are using the TDC1000-TDC7200EVM, the existing component values are listed in the user's guide (www.ti.com/.../sniu021a.pdf) in the board schematic. Again, you can use any filter topology you like in its place, but if you wish to use the pads on the board, it would be best to match the existing topology.

    I am attaching a TINA simulation of this topology that is currently set with a center frequency of 2Mhz. You will have to modify this model to get a center frequency of 40kHz, but it will allow you to test different configurations before implementing it on the board.

    2Mhz Filter.TSC

    For register configurations, please visit the TDC1000 technical documents page where you will find application notes with guides to set up the device for specific applications. The notes listed below will likely be the most relevant for your situation.

    Regards,

  • 0 in reply to Scott Cummins
    Intellectual 750 points

    Thanks for reply dear scott cummins,
    i)actually i have used general filter design dividing band pass filter into low pass and high pass by using C=1/2*pi*f*R ,center freq=40Khz because am using 40Khz transducer but for that tx transducer is not resonating.i have designed filter using the formula that has mentioned in data sheet by taking fc=40Khz,fB=3Khz,RF1 = 1 kΩ ± 10% and CF2 = 50pF for this also transducer is not resonating.


    ii)ans for your second post is am not using a TDC1000-TDC7200EVM am using arduino uno board in place of MSP 430 and as usual tdc1000 and tdc7200