SLDA058 March   2021 TUSS4470

 

  1.   Trademarks
  2. 1Review of Ultrasonic Sensing Range Performance Factors
    1. 1.1 Physical Parameters
    2. 1.2 Transducer Characteristics
    3. 1.3 AFE Device Configuration
  3. 2Methods Overview
    1. 2.1 Introduction
    2. 2.2 Hardware Configuration
      1. 2.2.1 Transducers
      2. 2.2.2 Experimental Setup: Air-Coupled Level Sensing
      3. 2.2.3 Experimental Setup: Water-Coupled Level Sensing
      4. 2.2.4 TUSS4470 EVM Hardware Configuration
      5. 2.2.5 TDC1000-C2000EVM Hardware Configuration
    3. 2.3 Firmware Configuration
      1. 2.3.1 TUSS4470 Power Configuration
      2. 2.3.2 TUSS4470 220 kHz Configuration
      3. 2.3.3 TDC1000 220kHz Configuration
      4. 2.3.4 TDC1000 220kHz Configuration
      5. 2.3.5 TDC1000 1 MHz
  4. 3Short Range Air-Coupled Test Results
    1. 3.1 TUSS4470
    2. 3.2 TDC1000
  5. 4Mid-Range Air-Coupled Test Results
    1. 4.1 TUSS4470
      1. 4.1.1 Concept
      2. 4.1.2 TUSS4470 35 V Results
    2. 4.2 TDC1000
  6. 5Short Range Water-Coupled Test Results
    1. 5.1 TUSS4470
    2. 5.2 TDC1000
  7. 6Resistive Damping Device Comparison
    1. 6.1 TUSS4470
    2. 6.2 TDC1000
  8. 7Summary
  9. 8References
  10.   A Appendix A
    1.     A.1 TUSS4470: Filter Capacitor Selection
    2.     A.2 TUSS4470: Shematic
  11.   B Appendix B
    1.     B.1 TDC1000 Misc.
    2.     B.2 TDC1000-C2000EVM Schematic

2.3.3 TDC1000 220kHz Configuration

Table 2-3 TUSS4470 Suggested 1MHz Evaluation FW Setup
TX Setting Short Range Value Mid-Range Value RX Setting Value Output Setting Short Range Value Mid-Range Value
BURST_PULSE 1-3 10 BPF_HPF_FREQ 400p ECHO_INT_
COMP_EN		 Disabled Disabled
HALF_BRG_
MODE		 Enabled Disabled LOGAMP_DIS_
LAST_GM		 Disabled Record (GUI record time) 12 ms 12 ms
Frequency 1 MHz LOGAMP_DIS_
FIRST_GM		 Disabled
BPF_BYPASS Enabled

Evaluation Notes:

The band pass filter is configurable for use up to 500 kHz. For 1 MHz transducer operation, BPF_BYPASS should be set to one, converting the BPF to a HPF with cut-off frequency BPF_HPF_FREQ set to 400 kHz. In short range water-coupled applications, the dynamic range of the received echo should be sufficient without the log amplifier enabled. Probing VOUT with an oscilloscope will show more accurate results than the GUI VOUT plot due to the higher sampling rate of the scope. The ADC used to sample VOUT by the host MCU samples at 1 MSPS.