Hi,
during characterization tests on some USS piezo samples, we figured out that the impedance module at 1MHz decreases with respect to the increase of the water temperature. What is the minimum piezo impedance the USS AFE of MSP430FR6047 could drive without being damaged?
We ask this question because we detected breakages in one of the two USS channels during these tests (see images below, captured with USS design center).
Figure 1 shows a performance decrease of the damaged channel, figure 2 shows a total absence of signal transmitted by damaged channel (verified through oscilloscope).
The damaged channel signal is represented by blue line.
What are the possible causes of a similar USS channel breakage, in your experience?
