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TDC7201: What happens with multiple START pulses?

Matthew Fleenor
Prodigy 10 points
Part Number: TDC7201

Tool/software:

We are attempting to utilize the TDC7201 as a combination pulse width and frequency sensor.

We have connected the START and STOP signals together. For pulse width measurement, we configure it to look for 1 stop signal in MODE 1, and set the START to look for a rising edge, and the STOP to look for falling.

For frequency measurement, we configure it to look for 5 stops in MODE 2, then measure the time between each STOP.

The problem I am worried about is that there will be a START signal between each STOP signal. I cannot find in the datasheet what the device will do if there is an extra START pulse between the STOP pulses.

Any guidance here would be appreciated,

Matt

  • 0
    TI__Mastermind 22550 points

    Hello Matthew,

    Thanks for posting to the sensors forum! I was not able to get to you question today but I will review it tomorrow and get back to you then.

    Best,

    Isaac

  • +1 in reply to Isaac Lara
    TI__Mastermind 22550 points

    Hello Matthew,

    Sorry for the delayed response here but the multiple START pulses while you are making a measurement should not affect your measurement at all. The device is designed to ignore START pulses once the measurement has received the first START pulse. I am guessing the concern is due to your START and STOP signals being connected together so this shouldn't be an issue since only the STOP circuitry would be active.

    I hope this helps!

    Best,

    Isaac