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Original question:

BOOST-TUSS4470: About the interface of BOOST-TUSS4470

BOOSTXL-TUSS4440: Missing documentation to set frequency?

Zak McKraken
Prodigy 70 points
Part Number: BOOSTXL-TUSS4440
Other Parts Discussed in Thread: TUSS4440,

I can not see how to set the frequency of the transducer.  This is related to my other question, what is the frequency of the bundled transducer.

The user guide mentions CFLT/CINN with no further explanation:

"Set the CFLT shunt(s) at J1 and CINN shunts(s) at J4 to most closely equal (or rounded up to) the calculated capacitance values based on the transducer frequency."

Akeem has answered a question here and hints at a table (Table 20) that I can not find

"To configure the device for 200 or 300kHz operation, refer to datasheet equations in Table 20 Recommended Component Values for Typical Applications to solve for the C_INN and C_FLT capacitor values as a function of transducer frequency. Be sure to set BPF_HPF_FREQ register value to most closely match the transducer frequency value"

Clearly the documentation is still evolving for this product, looking forward to getting some clarification.

Thank you

  • 0
    TI__Mastermind 27950 points

    Hi Zak,

    I've responded to your other post regarding the included transducer details (40kHz PUI Audio UTR-1440K-TTR).

    Regarding the calculation of the C_INN and C_FLT values, it's the TUSS4440's datasheet "Table 21. Recommended Component Values for Typical Applications" that shows how to calculate these values based on f_DRV_CLK (transducer frequency).

    If you haven't already, I recommend that you view the beta "BOOST-TUSS44x0 EVM-GUI Overview and Quick Start Video" on the Ultrasonic E2E FAQ page for a quick walk through on how to configure the registers and run the tool at https://e2e.ti.com/support/sensors/f/1023/t/748143

    Here is a look-up table of C_INN and C_FLT values I've calculated in spreadsheet form:

    Freq (kHz) CINN (nF) CFLT (nF)
    30   141.4710605   21.22066
    40   106.1032954   15.91549
    50   84.88263632   12.7324
    60   70.73553026   10.61033
    70   60.63045451   9.094568
    80   53.0516477   7.957747
    90   47.15702018   7.073553
    100   42.44131816   6.366198
    110   38.58301651   5.787452
    120   35.36776513   5.305165
    130   32.64716781   4.897075
    140   30.31522726   4.547284
    150   28.29421211   4.244132
    160   26.52582385   3.978874
    170   24.96548127   3.744822
    180   23.57851009   3.536777
    190   22.33753587   3.35063
    200   21.22065908   3.183099
    210   20.2101515   3.031523
    220   19.29150825   2.893726
    230   18.45274703   2.767912
    240   17.68388257   2.652582
    250   16.97652726   2.546479
    260   16.32358391   2.448538
    270   15.71900673   2.357851
    280   15.15761363   2.273642
    290   14.6349373   2.195241
    300   14.14710605   2.122066
    310   13.69074779   2.053612
    320   13.26291192   1.989437
    330   12.8610055   1.929151
    340   12.48274063   1.872411
    350   12.1260909   1.818914
    360   11.78925504   1.768388
    370   11.47062653   1.720594
    380   11.16876794   1.675315
    390   10.88238927   1.632358
    400   10.61032954   1.591549
    410   10.35154101   1.552731
    420   10.10507575   1.515761
    430   9.87007399   1.480511
    440   9.645754127   1.446863
    450   9.431404035   1.414711
    460   9.226373513   1.383956
    470   9.030067693   1.35451
    480   8.841941283   1.326291
    490   8.661493502   1.299224
    500   8.488263632   1.27324
    510   8.32182709   1.248274
    520   8.161791953   1.224269
    530   8.007795879   1.201169
    540   7.859503363   1.178926
    550   7.716603301   1.15749
    560   7.578806814   1.136821
    570   7.445845291   1.116877
    580   7.317468648   1.09762
    590   7.193443756   1.079017
    600   7.073553026   1.061033
    610   6.957593141   1.043639
    620   6.845373896   1.026806
    630   6.736717168   1.010508
    640   6.631455962   0.994718
    650   6.529433563   0.979415
    660   6.430502751   0.964575
    670   6.334525098   0.950179
    680   6.241370317   0.936206
    690   6.150915675   0.922637
    700   6.063045451   0.909457
    710   5.977650445   0.896648
    720   5.894627522   0.884194
    730   5.8138792   0.872082
    740   5.735313265   0.860297
    750   5.658842421   0.848826
    760   5.584383968   0.837658
    770   5.511859501   0.826779
    780   5.441194636   0.816179
    790   5.372318754   0.805848
    800   5.30516477   0.795775
    810   5.239668908   0.78595
    820   5.175770507   0.776366
    830   5.113411826   0.767012
    840   5.052537876   0.757881
    850   4.993096254   0.748964
    860   4.935036995   0.740256
    870   4.878312432   0.731747
    880   4.822877063   0.723432
    890   4.768687433   0.715303
    900   4.715702018   0.707355
    910   4.663881116   0.699582
    920   4.613186756   0.691978
    930   4.563582598   0.684537
    940   4.515033847   0.677255
    950   4.467507175   0.670126
    960   4.420970641   0.663146
    970   4.375393625   0.656309
    980   4.330746751   0.649612
    990   4.287001834   0.64305
    1000   4.244131816   0.63662
  • 0 in reply to Akeem Whitehead
    Prodigy 70 points

    Thanks again Akeem, 

    The video is mentioned but not linked on that page:

    "TUSS44x0 E2E Content:

    BOOST-TUSS44x0 EVM-GUI Overview and Quick Start Video:"

    Also, can I assume the BOOSTXL-TUSS4440 is configured for the 40khz UTR-1440K-TT-R out of the box?

  • 0 in reply to Zak McKraken
    TI__Mastermind 27950 points

    Zak,

    What web browser are you using to find the video? I checked the Ultrasonic E2E FAQ page on both my desktop and mobile, and the video is shown on both. It is not a hyperlink, it's an embedded video on the page. You may need to scroll down a little further since it has a small play button thumbnail.

    The BOOSTXL-TUSS4440 should be configured for a 40kHz transducer out-of-box, so you do not need to move the C_INN and C_FLT capacitor jumpers. It's always good to double check the jumper positions though!

  • 0 in reply to Akeem Whitehead
    Prodigy 70 points

    Hi Akeem,

    Browser is Safari on macOS.  I inspected the HTML and the video seems to be positioned at -10000px for some reason, it's fine on Chrome so I suspect some js/css failed to move it in place on Safari.

    Thank you again, I think I am set.

    Zak.