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BOOSTXL-TUSS4470: BOOSTXL-TUSS4470 and MSP-EXP430F5529LP with STEMInc SMD15T21R111WL transducer - inconsistent voltages

John Curry1
Prodigy 160 points
Part Number: BOOSTXL-TUSS4470
Other Parts Discussed in Thread: TUSS4470,

I purchased two of each: BOOSTXL-TUSS4470, MSP-EXP430F5529LP from Texas Instruments and a 1Mhz transducer, SMD15T21R111WL from STEMInc that was recommended by the TI support forum for use with these boards to measure water level. Our results, however, are unlike the example image shown on page 16 of the TUSS44x0 user guide, section 3.5.2.2, "Figure 13. Data Monitor - Data Dump". I have included an image of our output and settings. We got similar results on both of our test boards. We set up two test acrylic containers (3.5" x 3.5" x 8") by exactly following the instructions provided and using the materials described in this video on the Texas Instruments Youtube Channel : https://www.youtube.com/watch?v=ZtUkt8Q4EJE including dampening RTV silicone. The voltage/distance oscillation we observed is much greater than shown in the data dump example. Besides settings that are shown in the attached images, these are the variables we modified during testing : 


1) changed VDRV_CURRENT_LEVEL from 10mA to 20mA.
2) changed the speed of sound value for the TOF calculator to 1480
3) tested with a 10 ohm and 270 ohm resistor described here:
       https://e2e.ti.com/support/sensors/f/1023/p/883712/3270017?tisearch=e2e-sitesearch&keymatch=steminc#3270017

4) tested one transducer with dampening RTV silicon and one without
5) changed BPF_BYPASS to HPF_ENABLED

Since this combination of transducer and hardware was recommended by Texas Instruments on this forum, are there any other variables that may allow our results to be more consistent with the example in the user guide, or at least, with less voltage variation?  Thanks for any ideas or suggestions,

with 270 Ohm resistor between TUSS4470 and transducer in 6cm of water:

XML file:

Fullscreen test4_6cm_water_16_pulses_270Ohm_600_samples.xml Download 
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with no resistors between TUSS4470 and transducer in 6cm of water:

XML file:

Fullscreen test4_6cm_water_16_pulses_300_samples.xml Download 
<Chart Size="832, 233">
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with no resistors between TUSS4470 and transducer in 6cm of water using 14ms range:

TUSS-4470 user guide example:

  • 0
    TI__Mastermind 27950 points

    Hi John,

    I have attached the TUSS4470 register map settings I used to capture the water level example results with the 1MHz SMD15T21R111WL transducer: 

    Fullscreen INDUS_REG_USER_MEMSPACE_447-StemincTDCXDCR_Optimized.txt Download 
    ;INDUS_REG_USER_MEMSPACE
10 (BPF_CONFIG_1),5F
11 (BPF_CONFIG_2),00
12 (DEV_CTRL_1),1C
13 (DEV_CTRL_2),C1
14 (DEV_CTRL_3),00
15 (DEV_CTRL_4),00
16 (VDRV_CTRL),40
17 (ECHO_INT_CONFIG),07
18 (ZC_CONFIG),14
19 (XFMR_DRV_LIM),00
1A (BURST_PULSE),04
1B (TOF_CONFIG),02
1C (DEV_STAT),08
1D (DEVICE_ID),B9
1E (REV_ID),02
1F (DEV_TI_UNLOCK),00
EOF

    You can import this text file into the Memory Map page of the GUI.

    These results are further detailed in section "4.2.3 Fixed Gain at High Frequency" of the Logarithmic Amplifier for Ultrasonic Sensor Signal Conditioning app report.

    Be sure to set CFLT = 0.68nF and CINN = 4.7nF using the two mini jumper block selectors (J1 and J4 respectively) on the BOOSTXL-TUSS4470. If these capacitor filter values are still at their default 40kHz values, then you will not be able to see the 1MHz response, and would explain why the ring-decay is so long.

    I also notice that your VDRV_READY bit is flagged in the status section. Your VDRV_HI_Z will always startup to "In HiZ" by default, meaning the driver block is not receiving the VDRV_VOLTAGE_LEVEL. Change VDRV_HI_Z to "Not HiZ" for the driver to transmit with 5V.

    See the BOOST-TUSS44x0 EVM-GUI Overview and Quick Start Video for a walkthough of the EVM-GUI towards the bottom of the Ultrasonic FAQ E2E page: https://e2e.ti.com/support/sensors/f/1023/t/748143

    For 1MHz evaluation, I recommend that you also use an oscilloscope to probe and monitor the VOUT pin. The GUI will work, but the resolution is less effective for short range liquid level sensing.

  • 0 in reply to Akeem Whitehead
    Prodigy 160 points

    Hi Akeem, 

        I read the document you linked to at the top of your paragraph,  Logarithmic Amplifier for Ultrasonic Sensor Signal Conditioning and noticed my resistor was placed in series. The document states it should be placed in parallel to the transducer.  After loading the settings you provided from the text file and placing a 10 ohm resistor in parallel as described on page 14 of that document, the graph looked like this:

    I don't have a 400p option in the drop down menu for BPF_HPF_FREQ, but the value shown in the photo above, 218.26kHz was assigned after loading the settings you provided.  The value shown on the green graph is very close to the actual measured water level of 60mm and has a single major peak that is consistent between measurements  This extra detail of adding a dampening resistor in parallel with the transducer seems to have resolved the issues i had.   When I posted the original test images, I had the SHUNTS for CFLT and CINN placed on jumpers C1 (0.68nF) and C12 (4.7nF) as described in section 8.2 of the TUSS4470 datasheet , section 1 and section 4.12 of the TUSS44x0 user guide and your lookup table from this forum.  The TUSS4470 and transducer now appear to be measuring accurately.  Thanks again for your help and suggestions,  

    John

  • 0 in reply to John Curry1
    TI__Intellectual 1010 points

    Hi John,

    I'm Analog FAE supporting Dover group of companies including Hydro-Engineering. Have sent you an email to discuss further on this.

    - Shashank