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Number of transmission pulses and Stop pulses for TDC1011

Aditya kumar singh
Intellectual 270 points
Other Parts Discussed in Thread: TDC1000, TDC7200

How to choose the number of stop pulses in level sensing and what will be the effect of choosing different number of stop pulses on level sensing?

What is the effect of different number of Tx pulses on level sensing?

  • 0
    TI__Mastermind 21685 points
    Aditya,

    Please review this app note

    www.ti.com/.../snaa270.pdf


    One approach to increase the amplitude of the received echo is by increasing the number of TX pulses on the transmit side. You can also use PGA Gain on the receive side and amplify the echo. In general, for level measurement, choose 1 stop and make sure the threshold and other settings are chosen properly so the echo corresponds to the level. During these experiments it's better you monitor the START, STOP and COMPIN signals as discussed in the app note and understand the effect of these controls.

    Thanks,
    Vishy
  • 0 in reply to Vishy Viswanathan
    Intellectual 270 points
    What happens if I use more than 1 stop pulse in case of level sensing?
  • 0 in reply to Aditya kumar singh
    TI__Mastermind 21685 points
    As shown in Figure 34 of the DS, TDC1000 will generate a stop pulse corresponding to every valid echo envelope. If the number of expected stop pulses programmed in NUM_RX is not received or the time of flight operation times out, the TDC1000 will generate an error condition. Thetime measurement unit (TDC7200 or MCU) should also be capable of handling multiple stops and the MCU software should have intelligence to decide which stop corresponds to the actual level.