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MSP430FR6047: Trace length matching to transducers

Part Number: MSP430FR6047

I noticed the EVM430-FR6047 layout has symmetrical traces with matched lengths for the CH0/CH1 I/O. How important is this matching? Would it be beneficial to use striplines if internal layers are available?

  • Hello Barrett,

    It is important to have the traces the same length or the time of flight measurement could be affected.  Usually, the easiest layout path for this is to have the traces symmetrical, but if this is not possible, it is recommended to add extra trace length on the shorter trace to match the trace lengths exactly.  Stripline should not be required.

  • Hi Eddie,

    For the PCB layout, the CH0 piezo needs to be placed on the in-house side(down stream) and CH1 piezo needs to be on street side(upstream).

    I believed that the current eval board firmware has CH0 for street side and CH1 for house side.

    Is the water direction mandatory?

    If not, how does the reveres direction affect the firmware change?

    Thanks,

    Chris

  • Hello Chris,

    If the water is flowing in reverse direction, this will result in a negative value for aToF, dToF, and flow rate.  If you are connecting your transducers in a different manner, you can change the sequence selection in USS_userConfig.h.  

    #define USS_SEQUENCE_SELECTION                            USS_CAPTURE_SEQUENCE_SELECTION_CH0_CH1

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