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TDC1000-GASEVM: Oh My Goodness it doesn't work out of the box!

Michael Gambuzza
Prodigy 100 points

Part Number: TDC1000-GASEVM

I spent hours trying to get this evaluation board to work with a 300kHz transducer in air to measure any small distance.  Now when I look at the transducer with the scope I see 300kHz 30V pulses and what looks like ringing but see no evidence of an echo even when the baseline is expanded greatly on the scope.  I may have a defective transducer so I am getting a few different kinds. What I mainly want to know now is related to the configuration registers.  Is there a Webench tool that can generate the configuration file for the application?  It is implied that there is but I can't find it anywhere. The configuration screen is pretty cryptic and I'm not quite sure if I should be in Mode 0,1,2 I am doing pulse echo single transducer.

Thanks

  • 0
    TI__Genius 11015 points
    Michael,

    Please run the GUI as per the instruction in www.ti.com/.../sniu026a.pdf.

    Refer the datasheet : www.ti.com/.../tdc1000.pdf for the Mode description in Sections 8.4 Device Functional Modes.

    Mode 0 is typically used to measure short TOF and in Gas EVM you can typically use Mode 0 and use single transducer.
  • 0 in reply to Bharat Aravamudhan
    Prodigy 100 points
    Bharat: Thanks for the mode 0 clarification. I see references to a Webench that generates a config file for this part. Does that exist?
  • 0 in reply to Bharat Aravamudhan
    Prodigy 100 points

    Fullscreen 6874.TDC1000_Setup.txt Download 
    TDC1000_Config0                         25
TDC1000_Config1                         00
TDC1000_Config2                         00
TDC1000_Config3                         00
TDC1000_Config4                         00
TDC1000_TOF-1                           00
TDC1000_TOF-0                           00
TDC1000_Error_Flags                     00
TDC1000_Timeout                         00
TDC1000_Clock_Rate                      00
TDC1000_Conts_Trigger                   00
TDC7200_Config1                         00
TDC7200_Config2                         00
TDC7200_Interrupt_Status                00
TDC7200_Interrupt_Mask                  00
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                     0001
TDC_AVG/STDEV_NUM_ELEMS                 000A
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                         00000000004C4B40
GRAPH_YMIN_DATA                         0000000000030D40
TDC1000-HV_DRV_EN1                      01
TDC1000-HV_DRV_EN2                      01
HV_DRV_EN1_Period                       001E
HV_DRV_EN2_Period                       001E
ENABLE_POWER_CYCLE                      00
CLK_FREQ_(1-16MHz)                      1.200000
CLK_SOURCE_SEL                          03
CPU_CLK_FREQ                            04
CPU_CLK_EN                              01
TDC1000-HV_BST_PWR_EN                   01
HV_BST_PWR_EN_Period                    0000
FWD2REV_FLOW_DELAY                      0000
TDC1000-IMPE_MATCH_EN                   00
ENABLE_UART_STREAM                      00
ENABLE_MSP430TIMER_TDC                  00
    Fullscreen 6874.TDC1000_Setup.txt Download 
    TDC1000_Config0                         25
TDC1000_Config1                         00
TDC1000_Config2                         00
TDC1000_Config3                         00
TDC1000_Config4                         00
TDC1000_TOF-1                           00
TDC1000_TOF-0                           00
TDC1000_Error_Flags                     00
TDC1000_Timeout                         00
TDC1000_Clock_Rate                      00
TDC1000_Conts_Trigger                   00
TDC7200_Config1                         00
TDC7200_Config2                         00
TDC7200_Interrupt_Status                00
TDC7200_Interrupt_Mask                  00
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                     0001
TDC_AVG/STDEV_NUM_ELEMS                 000A
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                         00000000004C4B40
GRAPH_YMIN_DATA                         0000000000030D40
TDC1000-HV_DRV_EN1                      01
TDC1000-HV_DRV_EN2                      01
HV_DRV_EN1_Period                       001E
HV_DRV_EN2_Period                       001E
ENABLE_POWER_CYCLE                      00
CLK_FREQ_(1-16MHz)                      1.200000
CLK_SOURCE_SEL                          03
CPU_CLK_FREQ                            04
CPU_CLK_EN                              01
TDC1000-HV_BST_PWR_EN                   01
HV_BST_PWR_EN_Period                    0000
FWD2REV_FLOW_DELAY                      0000
TDC1000-IMPE_MATCH_EN                   00
ENABLE_UART_STREAM                      00
ENABLE_MSP430TIMER_TDC                  00
    Can I have you look at the config file attached? This is for a 300kHz transducer in air. Max distance about 12".

  • 0 in reply to Bharat Aravamudhan
    Prodigy 100 points

    Bharat:

    Here's a scope photo of what I am getting with a 200kHz transducer. Keep in mind I've tried several transducers of different frequencies and get the same results. Top trace is comp, second trace is Start, and thrid trace is Stop.  I realize that Stop pulse is latching on to ringing but even if I blank that out using short ToF I still don't see a valid echo on comp. My range is only going to be roughly 1 foot. Suggestions please.

  • 0 in reply to Michael Gambuzza
    TI__Genius 11015 points
    Mike,

    Please adjust your boost your COMP pin out data, the device could miss the COMP data since it is less than the VCOM value.