Software
17
SLAU822A – December 2019 – Revised April 2020
Copyright © 2019–2020, Texas Instruments Incorporated
TUSS44x0 EVM for Ultrasonic Sensors User's Guide
❏
Point the transducer in the direction of the target, and minimize unwanted-reverberating reflections by
clearing the transducers field-of-vision (FOV) from restricted spaces, clutter, or noisy test
environments.
❏
Configure the device settings for the selected profile. As a minimum requirement, the user is
responsible for setting the transducer specified frequency, burst pulse count, and driver current
strength. Set the record length to a value greater than the equivalent round-trip time to the target. For
example, if your target is at 2m, the record length round trip time must be set to a minimum value of
12.288 ms (or 2.107 m). Use the
Time-of-Flight Converter
on the
Utilities
tab to determine what the
minimum record time length must be for a target at any given distance.
3.5.2.3
Measurements and Diagnostics
Plots and exports the echo time-of-flight converted to distance (meters) and amplitude per sample based
on the GUI threshold.
Figure 14. Data Monitor - Measurement and Diagnostics
Clear —
Immediately removes all points from the chart.
Export —
Immediately exports the chart data as an XML file.
Export Per Loop —
Exports the chart data as an XML file at the end of each time-of-flight command.
Cursor Indicators —
When any sample of the chart is clicked, the cursor will report the distance (meters)
at the indicator .
3.5.2.4
Tabulated Results
Tabulates and exports the numerical results for the last command cycle's time-of-flight (milliseconds)
result, time-of-flight converted to distance (meters) and amplitude, for one object based on the GUI
threshold. The GUI always refers to the maximum VOUT amplitude value exceeding the threshold as the
object. If the decay is captured within the GUI threshold start time, the GUI may assume the decay to be
the object. TI recommends setting the GUI threshold start time to the end of decay. When the Echo
Interrupt feature of pin O4 is enabled, the low-to-high toggle transition result is displayed in the Tabulated
Results.
