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TDC7200 TRIGGER pin is always '0'

Vahid Behravan28
Prodigy 10 points
Other Parts Discussed in Thread: TDC7200, TDC7200EVM

Hi,

I have designed a PCB using TDC7200.

VDD=3.3 and I checked that the VREG value is 1.6  during enable mode(I used 1uF external cap).

I set enable pin, then wait for almost 2ms and then set START_MEAS bit (I verified the signals on SPI bus to make sure the signalling is correct), however

I don't see any trigger on TRIGGER pin ( all other registers have their default values)

Any other thing I can check before assuming the chip is dead?

Thanks,

Vahid.

  • 0
    TI__Mastermind 21685 points
    Vahid,

    If you are able to read/write the device registers and VREG value is close to 1.6V, I don't think the chip is dead. What's the clock input connected to? Can you show us TDC7200 portion of the schematic? Please double check your SPI write code. May be it is not setting the START MEASUREMENT bit correctly.

    Did you experiment with TDC7200EVM? You can find TDC7200EVM firmware source code as part of the GUI installation folder
    C:\Program Files (x86)\Texas Instruments\TDC7200EVM\Firmware

    Thanks,
    Vishy
  • 0
    Prodigy 30 points
    Hello, I'm having the same issue here with the '0' Trigger pin.
    Have you resolved your issue?