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TUSS4470: Confusion on what the TUSS4470PSM (reference design) offers

Jake Czajkowski
Intellectual 350 points
Part Number: TUSS4470
Other Parts Discussed in Thread: ENERGIA,

Hi,

I am looking to get multiple of the TUSS4470PSM reference design manufactured for my application due to the smaller form factor. After looking through documentation and guides on Ultrasonic sensor modules offered by TI, I am still slightly confused about how I can build a full ultrasonic sensing system using multiple of the TUSS4470PSM and how I would get started with software development.

1) Would I just have to modify the Energia example code for the BOOSTXL-TUSS4470 evaluation module in order to get operational code for the TUSS4470PSM + controller system?

2) Am I correct in thinking that I will be able to connect up to 8 of the TUSS4470PSM modules to an adequate microcontroller to allow communication over SPI? Would I need any extra components?

Thank you,

Jake

  • 0
    TI__Expert 7495 points

    Hi Jake,

    Yes, you can use the Energia examples.  The following document provides some details on the software:

    https://www.ti.com/lit/an/slaa941/slaa941.pdf?ts=1603850670900&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTUSS4470

    In addition to the TUSS4470PSM modules, you would also need transducers to connect to header J1.  The component values used in the board work best with 300 KHz transducers.  You can use a transducer of another frequency, but you would have to modify the FLT (C1) and INN (C5) capacitors on the board according to the equations in Section 8.2 of the TUSS4470 datasheet.

    Also, you will have to provide external power sources to the board’s VDD and VPWR voltage rails.  Unlike the VPWR rail, please note that the VDD voltage rail must be stable for maximum performance.  In the TUSS44x0 EVM, an LDO was used to create the stable VDD rail from the VPWR rail; however, since the TUSS4470PSM module does not have this LDO, the VDD regulation would have to be done externally.  This regulation would have to be done with a high performance low noise LDO for best performance.

    One last comment: To be safe, please make sure not to short the outputs of the TUSS4470 devices together.  The outputs from different TUSS4470 devices should be connected to different pins on the microcontroller.  For each device that shares the same SPI port on the microcontroller, you would also want to have a different chip select to prevent conflicts between the SDO pins of the different devices.

    Regards,

    Mekre