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TDC7201-ZAX-EVM: Getting strange TOF value in TDC7201 GUI.

Łukasz Rak
Prodigy 65 points
Part Number: TDC7201-ZAX-EVM
Other Parts Discussed in Thread: TDC7201

Hi,
I am sending two PWM signals from arduino to START and STOP pins of TDC7201 EVM board. One of them is shifted in relations to other. You can take a closer look of them on the photo from osciloscope. As I understand, after successful configuration of the software I should get proper a distance between these signals in GUI, as you can read from the osciloscope its something about 6-7 microseconds. Instead I am getting high TOF value which is quickly droping to zero and then its stops. This value is calculated even if the STOP pin is disconnected from the TDC board which is strange because TOF value is calculated as time between input at START and STOP pins. I change the SMA connectors but its not the case. What might be the problem ? I attach every useful screenshot below  including register configuration.

  • 0
    TI__Genius 11015 points
    Hi,

    I have received your question & I will respond to your question by this week.
  • 0
    TI__Genius 11015 points
    You cannot supply 2 separate PWM signals to the START & STOP of the device . As you can check that there is also spec for a minimum timing between a START & STOP signal. In order to achieve the highest measurement accuracy, having the same edge polarity for the START and STOP input signals is highly recommended. Otherwise, slightly different propagation delays due to symmetry shift between the rising and falling edge configuration will impact the measurement accuracy.