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TDC1000-C2000EVM: How should I change the parameters in GUI for different freq transducers?

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Replies: 3

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Part Number: TDC1000-C2000EVM

Hello,

I'm designing a fluid level sensing with TDC1000. 

So I bought TDC1000-C2000evm for test.

It seems that the EVM-GUI is fixed for 1MHz transducer, so I should change the parameters and hardware components in EVM if I use different freq transducer. 

Could you give me some advice how should I change the parameters and components in EVM?

Currently I'm looking TDK's B59070Z0285D121 (285KHz), very thin transducer. 

Fluid level  :  From 0.5cm to 100cm. 

Thank you.

  • Hello,

    Thank you for your interest in TI ultrasonics.

    With the TDC1000-C2000EVM you are able to supply an external clock to the TX clock divider and TX generator of the TDC1000. To do this, move the jumper on JP1 from the "EVM" position to the "EXT" position and use J9 to input your desired clock signal. 

    Due to minimum sensing distance limitations in this application (ringing decay), I would recommend using a 1 MHz transducer if it is important to get an accurate reading down to 0.5 cm. The 285 KHz transducer you have selected may not work well below ~3cm liquid level. 

    regards,

    Gabriel

  • In reply to Gabriel Lake1:

    Thanks for your advice. 

    I changed it to 1MHz and some parameters in EVM.

    Got a good result.

    I have more questions, I should operate this by coin cell battery. 

    Because my module should be connected with IOT portable module.

    The current consumption of TDC1000 is 1.8uA(2 SPS) in datasheet, what is the SPS and what voltage condition? 

    From the datasheet TDC1000 can operate in 3.3V system is there any advice if I use 3.3V system?

  • In reply to user4553800:

    I'm glad you were able to sort it out. 

    SPS is short for samples per second (i.e. a transmit and receive). The overall current consumption will depend on how much time the device spends in the different operating modes and the rate of samples taken. The values in the "Power Supply" table on page 7 of the datasheet were used to come up with the 1.8uA average, and there you can find current consumption for the different modes. 

     

    3.3V operation is fine. 

    For coin cell supply operation:

    - Be sure to use a boost or buck converter as needed to step up/down and regulate the voltage at 3.3V. 

    - Connect the output to both VDD and VIO

    Lastly, I will add that you may also want to consider the TDC1011 single channel AFE or the newer TUSS4470, which also supports 1MHz level sensing, for your final design. 

    Regards,

    Gabriel