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TDC7200: The result register data of the TDC7200 is always 0

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Replies: 4

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Part Number: TDC7200

Hi Team,

The TDC7200 is in working mode 2 for use with the TDC1000. Use the oscilloscope to observe trigger, start, stop, and the pin has a clear pulse waveform.


Read the Interrupt Status Register (address = 02h) register of the TDC7200 and the result is 0x19. But when reading TIME1: Time 1 Register (address: 10h) and CLOCK_COUNT1: Clock Count Register (address: 11h), the two registers always have a result of 0.

When he uses mode 1, there will be normal values in the TIM1 register. Once changed to mode 2, the TIM1 register is always 0. The values in the CALIBRATION1 and 2 registers are also always 0. 

  • Annie,

    Please let me know the ToF value that your expect to measure. Also you see that you have a real signal on the COMPIN pin & STOP signals are generated.

    ---------------------------------

    Bharat Aravamudhan

    Sensor Signal Conditioning Applications

  • In reply to Bharat Aravamudhan:

    Hi Bharat,

    I apologize for any delay in responding to you due to National Day in China. The issue was resolved. Only 8bit data is read, and 24bit data should be read.

    Additionally, customer would like to know why calbration2<calbration1. He confirmed that the address was not written reversed.

  • In reply to Annie Liu:

    Annie,

    I am glad that the customer's first issue is solved.

    This is unique, please check if the customer is not mixing the calibration 1 & 2 values and what is the calibration period that he is setting in this system.

    ---------------------------------

    Bharat Aravamudhan

    Sensor Signal Conditioning Applications

  • In reply to Bharat Aravamudhan:

    Annie,

    Please let me know if you have any further confirmation from the customer in this regard. I will close this ticket for now until you get further info from the customer in this regard.

    ---------------------------------

    Bharat Aravamudhan

    Sensor Signal Conditioning Applications

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