• State Resolved
  • Locked Locked
  • Replies 5 replies
  • Answers 1 answer
  • Subscribers 32 subscribers
  • Views 1311 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Transducer recommended in Ultrasonic EVM / Transducer Selector tool not working

TMK
Prodigy 60 points
Other Parts Discussed in Thread: TDC1000, TDC7200

Hello, I´m using TDC1000-GASEVM + TDC1000-BSTEVM Board to measure air flow rate. I tried using SMATR300H19XDA - Ultrasonic Air Transducer 300 KHz - from STEMINC and is working fine in some range of flow. Now I´m trying get better results using one transducer from Morgan Ceramics 200KHz as recommended in Ultrasonic EVM / Transducer Selector tool. But with this transducer I can´t get any answer from the receiver. I can see the 5 pulses at 200Khz in the transmiter, but nothing in the receiver. I tried to use TDC Register File from the Transducer Selector tool but some error happens in the loading. I Tried to fix the file, load, but still no answer. Can somebody help?

  • 0
    TI__Mastermind 21685 points
    Toru,
    We will look into this and get back to you. In the meanwhile,
    a) could you please upload the config file you are using
    b) please have a look at this app note
    www.ti.com.cn/.../snaa284.pdf

    Thanks,
    vishy
  • 0
    TI__Expert 4725 points
    Toru,
    A few points that will help resolve your issue:
    1. Air transducers usually require more exctiaiton cycles (10-20) depending on the distance between them.
    2. It will greatly help if you include a scope shot showing the followinfg signals: Start, Stop, COMPIN.

    Regards,
  • 0
    Prodigy 60 points

    Hi, thank you for your quick answer, please see below the signals requested

    Config File loaded:

    TDC1000_Config0                         4F
    TDC1000_Config1                         45
    TDC1000_Config2                         12
    TDC1000_Config3                         0D
    TDC1000_Config4                         1F
    TDC1000_TOF-1                           E4
    TDC1000_TOF-0                           1E
    TDC1000_Error_Flags                     00
    TDC1000_Timeout                         3B
    TDC1000_Clock_Rate                      00
    TDC1000_Conts_Trigger                   00
    TDC7200_Config1                         02
    TDC7200_Config2                         40
    TDC7200_Interrupt_Status                07
    TDC7200_Interrupt_Mask                  07
    TDC7200_Coarse_Cntr_Ov_H                FF
    TDC7200_Coarse_Cntr_Ov_L                FF
    TDC7200_Clock_Cntr_Ov_H                 FF
    TDC7200_Clock_Cntr_Ov_L                 FF
    TDC7200_Clock_Cntr_Stop_Mask_H          00
    TDC7200_Clock_Cntr_Stop_Mask_L          00
    TRIGGER_UPDATE_FREQ                     0000
    TDC_AVG/STDEV_NUM_ELEMS                 0064
    SAVE_GRAPH_DATA_TO_FILE                 00
    FLOW_MODE_SELECT                        00
    Y-SCALE_CENTER                          0032
    X-SCALE_RANGE                           0032
    MEASURE_RTD1                            00
    SAVE_RESULT_REGR_TO_FILE                00
    GRAPH_MULTI_STOPS                       00
    TDC_SELECT                              00
    TEMP_RTD_SELECT                         00
    TEMP_RTD_MODE                           01
    TEMP_AVG/STDEV_NUM_ELEMS                000A
    SAVE_TEMP_DATA                          00
    GRAPH_YMAX_DATA                         0000000000000032
    GRAPH_YMIN_DATA                         FFFFFFFFFFFFFFCE
    TDC1000-HV_DRV_EN1                      01
    TDC1000-HV_DRV_EN2                      01
    HV_DRV_EN1_Period                       0064
    HV_DRV_EN2_Period                       0064
    ENABLE_POWER_CYCLE                      00
    CLK_FREQ_(1-16MHz)                      1,600000
    CLK_SOURCE_SEL                          02
    CPU_CLK_FREQ                            09
    CPU_CLK_EN                              01
    TDC1000-HV_BST_PWR_EN                   01
    HV_BST_PWR_EN_Period                    0BB8
    FWD2REV_FLOW_DELAY                      0000
    TDC1000-IMPE_MATCH_EN                   00

  • 0 in reply to TMK
    TI__Expert 4725 points

    Toru,
    Take a look at the following E2E post where I posted a working setup for 200kHz air transdcuers:
    (e2e.ti.com/.../498792)