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TDC1000-GASEVM: No START, STOP and COMPIN signals from the board

Akshay.Shinde
Prodigy 60 points

Part Number: TDC1000-GASEVM

I have been using the TDC1000-GASEVM board for the past two weeks along with 200kHz transducers. Until now i was getting satisfactory echoes and readings from the transducers and the board, but suddenly since two days I haven't been able to get START, STOP and COMPIN signals on the DSO. I am assuming something has gone faulty on the board. Any help or pointers would be appreciated. 

And I have put the config file currently running on the board, here below.

TDC1000_Config0 AF
TDC1000_Config1 40
TDC1000_Config2 00
TDC1000_Config3 01
TDC1000_Config4 1F
TDC1000_TOF-1 E4
TDC1000_TOF-0 1E
TDC1000_Error_Flags 00
TDC1000_Timeout 3F
TDC1000_Clock_Rate 00
TDC1000_Conts_Trigger 01
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 0000
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 0037
HV_DRV_EN2_Period 0037
ENABLE_POWER_CYCLE 00
CLK_FREQ_(1-16MHz) 12.800000
CLK_SOURCE_SEL 01
CPU_CLK_FREQ 09
CPU_CLK_EN 00
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

  • 0
    TI__Mastermind 31655 points
    Hello,

    The config looks alright. Has anything changed with the register configuration, or the board/transducer setup between when it was working and now? Are you certain that the TDC1000 is receiving a trigger signal from the TDC7200? My first step would be to check that there is a trigger signal when you initiate a new measurement.
  • 0 in reply to Scott Cummins
    Prodigy 60 points

    As far as the register configuration and the transducer setup goes, nothing has been changed. I haven't checked the trigger signal from the TDC7200 yet, will do that right away. I hope the board is alright.  

  • 0 in reply to Scott Cummins
    Prodigy 60 points
    Hello Scott,
    The TDC1000 is receiving a toggling trigger pulse(0 and 3.2V ) from the TDC7200 after initiating a new measurement. After some probing, i've also found that the VDD signal on the TDC1000 is about 3.8 V whereas that on the TDC7200 it is about 3.2V. Also, the COMPIN is showing a constant voltage of 1.8V and the START, STOP pins aren't showing anything. The same thing keeps happening even if I use Mode 0(Reflection/Echo) alongwith one transducer and a reflecting surface.

    Regards,
    Akshay