Other Parts Discussed in Thread: TDC1000, TDC7200
Hi,
I am using TDC1000EVM board for time of flight measurement for a Time domain reflectometer(TDR) measurement. I am not using TDC1000-Boost board and transmitting pulses from TDC1000EVM board only. In my application i have to transmit electromagnetic wave through a waveguide and measure time of flight between transmitted and reflected pulse. I am getting readings on GUI which matches with DSO measurements when i am using CPU clock of 1 MHz and time of flight is around 20 microseconds. But when i switch TDC1000 EVM clock source to on board oscillator of 13MHz my readings change and time of flight is in the range of 4 microseconds. Why there is change in time of flight with change in clock source? I am hereby attaching TDC1000 EVM configuration file.
Thanks
Nishant Sharma
TDC1000_Config0 41 TDC1000_Config1 41 TDC1000_Config2 00 TDC1000_Config3 08 TDC1000_Config4 1F TDC1000_TOF-1 C0 TDC1000_TOF-0 1E TDC1000_Error_Flags 00 TDC1000_Timeout 40 TDC1000_Clock_Rate 00 TDC1000_Conts_Trigger 00 TDC7200_Config1 00 TDC7200_Config2 40 TDC7200_Interrupt_Status 00 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 0001 TDC_AVG/STDEV_NUM_ELEMS 00C8 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 00000000000046B8 GRAPH_YMIN_DATA 0000000000004654 TDC1000-HV_DRV_EN1 00 TDC1000-HV_DRV_EN2 00 HV_DRV_EN1_Period 001E HV_DRV_EN2_Period 001E ENABLE_POWER_CYCLE 00 CLK_FREQ_(1-16MHz) 1.000000 CLK_SOURCE_SEL 03 CPU_CLK_FREQ 00 CPU_CLK_EN 01 TDC1000-HV_BST_PWR_EN 00 HV_BST_PWR_EN_Period 0000 FWD2REV_FLOW_DELAY 0000 TDC1000-IMPE_MATCH_EN 00 ENABLE_UART_STREAM 00 ENABLE_MSP430TIMER_TDC 00
