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6.3. Timing issues: length of the preamble

Module by: Thomas Watteyne. E-mail the author

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  • Use the oscilloscope to visualize the energy consumed by a board, you can clearly see the periodic wakeup of the CC2500 (see figure below, lower part).
    Figure 1: Energy consumed by the transmitter and the receiver in preamble sampling. To function, the length of the preamble needs to be larger than the check interval CI.
    current_ps
  • You can see that the time between two successive wake-ups is CI=104ms. Push the button and capture the energy consumed when the board is in transmit mode (see figure, upper part). You can see the series on 50 microframes sent.
  • By zooming in, you can see that one micro-frame is sent every Dcca=3.24ms. Hence, the length of the whole preamble is 50*3.24=162ms, which is larger that the check interval.

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