Part Number: TDC1000-TDC7200EVM
Hello,
I am designing a low-volume flow sensor for water with the TDC1000-7200EVM and 1MHz transducers (STEMINC SMDM21F1000, https://www.steminc.com/PZT/en/ultrasonic-flow-sensor-1mhz-send-receive). I cannot, no matter the settings, achieve a Delta ToF close to zero. I can see clear START, STOP, and COMP_IN signals on an oscilloscope, but the values output in the GRAPH tab of the GUI are always high (~300 ns) with a significant STDEV. I’m testing with deionized water at zero flow. Additionally, the ToF I measure on the scope varies with the AUTOZERO_PERIOD set in the GUI; shouldn’t that be a function of distance rather than a register setting? Any help regarding these matters would be much appreciated.
Hansen