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TDC1000-TDC7200EVM: water flow metering

rashmi hm
Intellectual 750 points

Part Number: TDC1000-TDC7200EVM

Dear sir, 

I have interfaced a TDC1000-TDC7200 without EVM board to my arduino board micro controller for flow meter application.

it is done successfully.

i am confused in trigger pin connection and working we have trigger pin in both TDC1000 and TDC 7200 how to provide trigger for both chip to get TOF measurement.

if i enable trigger pin by using microcontroller

 a) it shows a some garbage value reading even sensor is not connected to the TDC1000-TDC7200 without EVM board.

      why it shows some garbage reading even sensor is not connected to the TDC1000-TDC7200 without EVM board?

please tell me what is the problem in the interfacing ?

thanking you sir.

  • 0
    TI__Mastermind 31655 points
    Hello,

    Due to Thanksgiving holiday the responses on this forum have been delayed. I will be looking into this and get back to you.

    Regards,
  • 0 in reply to Scott Cummins
    TI__Mastermind 31655 points
    Hi Rashmi,

    The trigger pin is an output on the TDC7200, and an input on the TDC1000. The trigger output from the TD7200 needs to be connected to the trigger input on the TDC1000. To start a new measurement, the microcontroller will use SPI to set the Start New Measurement bit on the TDC7200. This will cause the TDC7200 to generate a trigger signal on its trigger pin which will then trigger the TDC1000 to begin its measurement sequence.

    Please reference the TDC1000-TDC7200EVM user's guide for a connection schematic example: www.ti.com/.../sniu021a.pdf

    Regards,