Texas Instruments TDC1000-GASEVM, Руководство пользователя, Страница: 12 / 40

Launching the Software
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Figure 6. Top to Bottom:
START Pulse,
Voltage on VDD Pin of UCC Driver,
Voltage Across Connector J1,
EN1 Signal on Oscilloscope
6. Observe the following signals: TDC1000's START (dark blue) on the TDC1000-GASEVM, VDD of
driver IC U2(light blue) on the HV board, transmit pulses on transducer connector J1 (green) and EN1
(pink) signals on the oscilloscope as shown in
Figure 6 . This shows that the VDD of the driver is turned
on in time and long enough for this number of pulses. If the last pulses are reduced in amplitude,
increase EN period in the “SETUP” tab of the GUI.
7. EN signal should go high about 30µs before START goes high.
8. Observe Tx pulses and voltage at the output of the high voltage drivers as shown in Figure 7 . Tx and
transducer voltage at connectors J1/2 should be in phase. Tx should have an amplitude of 3.7Vpk-pk
and transducer voltage 30Vpk-pk.
12 TDC1000-GASEVM and TDC1000-BSTEVM Kit User’s Guide SNIU026A – March 2015 – Revised December 2015
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